Em pacientes com doenças relacionadas à sobrecarga de ferro, a contínua quantificação dos níveis de ferro no corpo é necessária. O método biosusceptométrico se apresenta como uma alternativa confiável em relação aos métodos tradicionais devido ser uma medição direta do ferro no fígado não invasiva. O sistema biosusceptométrico desenvolvido no nosso grupo de pesquisa (Biomag) foi analisado, verificado e tornou-se funcional em uma nova localização. Primeiramente foram feitas medições de estabilidade do sinal, avalição da resposta susceptométrica com a utilização de um phantom, avaliação da variabilidade do fator de calibração no tempo; assim como, medidas da resposta susceptométrica para soluções de cloreto férrico (Fe Cl3 6H2 o). Assim, verificando-se o correto funcionamento do equipamento. Foram realizadas medidas biosusceptométricas em 13 voluntários assintomáticos; na segunda parte, foram realizadas medidas em 48 pacientes com doenças relacionadas à sobrecarga de ferro no fígado (talassemia e anemia falciforme). Com os dados coletados foi possível calcular o fator de correção necessário para o cálculo da concentração de ferro nos pacientes; além disso, notar a dependência da contribuição do fluxo magnético do paciente com o raio do torso. Foi estimado que o erro na medida na concentração do ferro hepático para medidas in vivo é de 0,244 mgFe/gwt. Medições em nanopartículas magnéticas (Mn Fe2 O4-citrate) foram feitas para soluções com diferentes concentrações, com dois métodos de medida diferentes. Os resultados mostram o potencial do biosusceptômetro para detectar e localizar nanopartículas magnéticas dentro do corpo humano, ou a quantificação da concentração em soluções, com uma calibração prévia do equipamento / In patients with diseases related with iron overload, the continuous measurement of iron levels in the body is required. The biosusceptometric method presents itself as a reliable alternative to traditional methods because it is a non-invasive direct measurement of iron in the liver. The biosusceptometric system developed in our research group (Biomag) was analysed, verified and became functional at a new location. First, measurements of signal stability were done, evaluation of susceptometric response with the use of a phantom, variability evaluation of calibration factor; as well as measurements of solutions of ferric chloride (Fe Cl3 6H2o). Thus, verifying the correct operation of the equipment. In the first part of in vivo measurements, biosusceptometric measurements were performed in 13 asymptomatic volunteers; in the second part, measurements were performed in 48 patients with diseases related to iron overload in the liver (thalassemia and sickle cell disease). With the collected data it was possible to calculate the correction factor necessary for the calculation of the iron concentration in patients; additionally, a dependence of the magnetic flux with the patient\'s torso radius was found. The error in the in vivo measurement of liver iron concentration was estimated in 0.244 $mgFe/gwt. Measurements on magnetic nanoparticles (Mn Fe2 O4-citrate) were made in solutions with different concentrations, with two different methods of measurement. The results show the potential of the biosusceptometer to detect and locate magnetic nanoparticles within the human body or the quantification of the concentration of solutions with a prior calibration of the equipment

Thesis (MEng)--Stellenbosch University, 2015. / ENGLISH ABSTRACT: The Superconducting Quantum Interference Device (SQUID) is one of the most sensitive magnetic field sensors in the world. These instruments can only be used optimally for geomagnetic research if placed far from man-made magnetic signals. Moving the SQUID to a remote site leads to several infrastructure-related problems including construction, power, data connectivity, and cryogenic cooling. This thesis investigates possible solutions to these problems and develops guidelines for designing future remote SQUID stations. A remote SQUID observatory typically consists of three structures placed approximately 40 m apart. These include: the control room, which houses all computers and supporting electronics, the power hut, which contains a regulated battery bank charged from a solar array that delivers DC power to the rest of the system, and the SQUID hut itself, which is thermally insulated by cavity walls. The SQUID is placed on an isolation pillar that decouples it from structural vibrations due to wind and outside temperature uctuations. The temperature inside the SQUID hut is also monitored as changes in temperature can result in small deformations of the SQUID mounting system which lead to changes in the SQUID's orientation. The changes in the orientation will appear as slow varying magnetic signals on the SQUID output. In principle, it is possible to compensate for these variations through post-processing. The SQUID needs to be cryogenically cooled to function. The SANSA SQUID is a High Temperature Superconductor (HTS) and operates using liquid nitrogen. Immersion cooling is used, as it is the simplest method, and produces the least amount of mechanical and electrical noise. Over time the liquid nitrogen will evaporate and needs to be replaced without significantly disrupting SQUID operations. A simple yet effective pumping scheme was developed that can transfer approximately 1.8 litres of liquid nitrogen every minute from a refill dewar. Monitoring of the liquid nitrogen level is an important management tool for a remote station, as refilling will be the primary reason for technicians to visit the site. The monitoring is achieved by placing the SQUID dewar on a specially designed non-magnetic load cell scale. The scale has been designed to limit the amount of tilting as the weight changes since this would also change the SQUID orientation. When a HTS SQUID is cooled in a large magnetic field, such as the Earth's field, Abrikosov vortices are likely to form in the superconducting material. As these vortices jump between pinning sites in the material, they increase the 1/f noise of the device and have been found to reduce the stability of the SQUID. Metal shields can be used to reduce the magnetic field, but are awkward to use and also reduce the magnitude of the signals of interest. In this thesis, a shielding method using Helmholtz coils is investigated. These coils are relatively simple and inexpensive to construct and do not attenuate the signals of interest. It was found that by cooling the SQUID in the reduced magnetic field, generated by the Helmholtz coils, the stability of the SQUID can be improved significantly. / AFRIKAANSE OPSOMMING: Die SQUID is die mees sensitiewe magneetveld sensors in die wêreld. Hierdie instrument kan slegs optimaal vir geometriese navorsing gebruik word indien dit ver van mensgemaakte magneetvelde opgestel word. Om die SQUID in 'n afgesonderde area op te stel veroorsaak verskeie probleme met betrekking tot infrastruktuur sover dit konstruksie, kragvoorsiening, en kriogeniese afkoeling aangaan. Hierdie tesis ondersoek moontlike oplossings vir die probleme en riglyne te ontwikkel vir die oprigting van toekomstige SQUID stasies. 'n Tipiese afgele SQUID observatorium bestaan gewoonlik uit 3 strukture wat 40m van mekaar opgestel is. Die beheerkamer bevat al die elektroniese apperaat, die kragkamer bevat 'n stel gereguleerde batterye wat deur sonpanele helaai word en DS krag verskaf aan die stasie en die SQUID-kamer wat deur middel van spoumure teen hitte gensoleer is. Die SQUID word op 'n gesoleerde pilaar geplaas om die invloed van vibrasies a.g.v. wind en wisselende buite temperature te verminder. Die temperatuur binne die SQUID kamer word ook noukeurig gemonitor aangesien wisseling in temperatuur geringe vervorming van die SQUID se montering kan veroorsaak wat 'n verandering van die SQUID se orintasie veroorsaak. Hierdie veranderings sal waargeneem word as stadige varirende sein in die SQUID se lesings. In beginsel is dit moontlik om vir dit te kompenseer deur middel van naprosessering. Die SQUID moet kriogenies afgekoel word om te funksioneer. Die SANSA SQUID is 'n Ho Temperatuur Supergeleier (HTS) en vloeibare stikstof word gebruik vir verkoeling. Afkoeling deur middel van indompeling word gebruik omdat dit die kleinste hoeveelheid meganiese en elektroniese versteuring veroorsaak. Die vloeibare stikstof verdamp mettertyd em moet vervang word sonder om die werking van die SQUID merkbaar te onderbreek. 'n Eenvoudige tog effektiewe oorpompstelsel is ontwikkel wat ongeveer 1.8 liter/minuut vloeibare stikstof vanuit 'n hervullings vakuum es kan oorpomp. Die meting van die vloeibare stikstof vlak is 'n belangrike aspek van die instandhouding van 'n afgele stasie aangesien dit die hoof rede sal wees vir tegnici om die perseel te besoek. Die meting word bewerkstellig deur die plasing van die SQUID se vakuum es op 'n spesiale ontwerpte, nie-magnetiese vrag sel skaal. Hierdie skaal is ontwerp om die mate van kanteling te beperk aangesien dit die orentasie van die SQUID kan benvloed. Wanneer 'n HTS SQUID binne in 'n groot magnetiese veld afgekoel word, is dit waarskynlik dat Abrikosov vortekse in die supergeleidende materiaal sal ontstaan. Soos hierdie vortekse rondspring in die materiaal vermeerder dit die 1/f ruis en daar is gevind dat die stabiliteit van die SQUID nadelig benvloed word. Metaal skilde kan gebruik word om die invloed van die magneetveld te verminder, maar is ongerie ik om te gebruik en verminder ook die sterkte van die seine wat waarneem wil word. In hierdie tesis word Helmholtz spoele ondersoek as 'n afskermings metode. Hierdie spoele is eenvoudig om te vervaardig en verminder nie die sterkte van waarneembare seine nie. Daar is gevind dat die stabiliteit van die SQUID merkbaar verbeter word deur afkoeling in 'n lae magnetiese veld soos bewerkstellig deur die Helmholtz spoele.

Neste projeto trabalhou-se no desenvolvimento de uma nova instrumentação para registrar medidas de campos magnéticos de origem biológica baseados em sensores SQUID e sistemas auxiliares, com o objetivo de usar este arranjo na aquisição de medidas de magnetocardiografia fetal (MCGf), que consiste no registro dos campos magnéticos gerados pela atividade cardíaca fetal, refletindo seus processos eletrofisiológicos. Esta técnica biomagnética além de ser bastante precisa para obter medidas de campo magnético originado do coração fetal, que é da ordem de dez picoteslas a poucos centímetros de distância do abdômen materno, também realiza medidas de forma não-invasiva, o que a torna bastante promissora. Contudo, não se conseguiu a sensibilidade desejada do sistema biogradiométrico, sendo alcançada uma sensibilidade capaz de detectar o sinal magneto-cardiográfico (MCG) de um sistema cardíaco desenvolvido, que é da ordem de 100 pT. Neste trabalho reuniu-se, ainda, toda a informação obtida pelo grupo de biomagnetismo no decorrer dos últimos anos referente ao sistema biogradiométrico multicanal. / In this project we worked in the developing of a new instrumentation for mea- sure magnetic fields of biological source based in SQUID sensors and auxiliares systems, with aim of use this suite in measures of fetal magnetocardiography (fMCG), that is the recording of the magnetic fields generated by the fetal heart's activity, reflecting the electrophysiological processes that happen in it. This biomagnetic technique besides to be accurate enough to obtain measures of the magnetic field originated from the fetal heart, that is of the order of ten picoteslas at a few centimeters distance from the maternal abdomen, also realizes measures in outside sections at the mother's body turning it so promise. However, not obtained the desired sensitivity of the biogradiometer system, achieving just a sensitivity capable of detecting the magnetocardiography (MCG) signal of a developed cardiac system, which is about 100 pT. This work has met, yet, all information obtained by the biomagnetism group over the past years referent to the multichannel biogradiometer system.

Em pacientes com doenças relacionadas à sobrecarga de ferro, a contínua quantificação dos níveis de ferro no corpo é necessária. O método biosusceptométrico se apresenta como uma alternativa confiável em relação aos métodos tradicionais devido ser uma medição direta do ferro no fígado não invasiva. O sistema biosusceptométrico desenvolvido no nosso grupo de pesquisa (Biomag) foi analisado, verificado e tornou-se funcional em uma nova localização. Primeiramente foram feitas medições de estabilidade do sinal, avalição da resposta susceptométrica com a utilização de um phantom, avaliação da variabilidade do fator de calibração no tempo; assim como, medidas da resposta susceptométrica para soluções de cloreto férrico (Fe Cl3 6H2 o). Assim, verificando-se o correto funcionamento do equipamento. Foram realizadas medidas biosusceptométricas em 13 voluntários assintomáticos; na segunda parte, foram realizadas medidas em 48 pacientes com doenças relacionadas à sobrecarga de ferro no fígado (talassemia e anemia falciforme). Com os dados coletados foi possível calcular o fator de correção necessário para o cálculo da concentração de ferro nos pacientes; além disso, notar a dependência da contribuição do fluxo magnético do paciente com o raio do torso. Foi estimado que o erro na medida na concentração do ferro hepático para medidas in vivo é de 0,244 mgFe/gwt. Medições em nanopartículas magnéticas (Mn Fe2 O4-citrate) foram feitas para soluções com diferentes concentrações, com dois métodos de medida diferentes. Os resultados mostram o potencial do biosusceptômetro para detectar e localizar nanopartículas magnéticas dentro do corpo humano, ou a quantificação da concentração em soluções, com uma calibração prévia do equipamento / In patients with diseases related with iron overload, the continuous measurement of iron levels in the body is required. The biosusceptometric method presents itself as a reliable alternative to traditional methods because it is a non-invasive direct measurement of iron in the liver. The biosusceptometric system developed in our research group (Biomag) was analysed, verified and became functional at a new location. First, measurements of signal stability were done, evaluation of susceptometric response with the use of a phantom, variability evaluation of calibration factor; as well as measurements of solutions of ferric chloride (Fe Cl3 6H2o). Thus, verifying the correct operation of the equipment. In the first part of in vivo measurements, biosusceptometric measurements were performed in 13 asymptomatic volunteers; in the second part, measurements were performed in 48 patients with diseases related to iron overload in the liver (thalassemia and sickle cell disease). With the collected data it was possible to calculate the correction factor necessary for the calculation of the iron concentration in patients; additionally, a dependence of the magnetic flux with the patient\'s torso radius was found. The error in the in vivo measurement of liver iron concentration was estimated in 0.244 $mgFe/gwt. Measurements on magnetic nanoparticles (Mn Fe2 O4-citrate) were made in solutions with different concentrations, with two different methods of measurement. The results show the potential of the biosusceptometer to detect and locate magnetic nanoparticles within the human body or the quantification of the concentration of solutions with a prior calibration of the equipment

[pt] Esta tese associa duas técnicas de fronteira na área de Ensaios Não-Destrutivos magnéticos, que são a utilização do magnetômetro supercondutor SQUID como instrumento de medida e de Redes Neurais como ferramentas de análise dos sinais detectados. Medidas pioneiras com o SQUID foram realizadas em amostras de aço e de alumínio contendo defeitos diversos, e foram idealizados e implementados dois Sistemas Neurais, os quais utilizaram combinações de vários tipos de redes neurais para, a partir do campo magnético medido, obter informações a respeito da geometria dos defeitos, possibilitando assim estimar sua gravidade. / [en] This thesis combines two state-of-the-art techniques in the area if magnetic Nondestructive Evaluation, that is, the application of the superconducting magnetometer SQUID as the magnetic sensor, and the use of Neural Networks as analysis tools for the detected magnetic signals. Pioneering measurements using the SQUID have been made in steel and aluminum samples with various types of flaws, and two Neural Systems have been implemented, based on the combination of several neural networks algorithms. Such systems aim to, based on the measured magnetic field, obtain information about defect geometry, thus allowing the assessment of defect severity.

[pt] Desenvolveu-se um método para Ensaios Não-Destrutivos de placas condutoras, utilizando o dispositivo supercondutor conhecido como SQUID (Superconducting Quantum Interference Device), disponível no Laboratório de Supercondutividade Aplicada e Magnetismo do Departamento de Física da PUC- Rio. O trabalho pode ser dividido em duas áreas: método experimental para obtenção das medidas magnéticas e algoritmos de processamento de imagens para realçar estes dados. / [en] It was developed a Nondestructive Evaluation method for conducting plates, using the superconducting device known as SQUID (Superconducting Quantum Interference Device), which is available in the Laboratory of Applied superconductivity and Magnetism of the Departament of Physics of PUC-Rio. The work may be separated in two fields: experimental method for obtaining the magnetic measures and image processing algorithms used to enhance this data.

La jonction Josephson (JJ) est le composé de base de nombreux circuits électroniques supraconducteurs (SQUID, détecteurs d’ondes millimétriques, logique RSFQ). Avec la découverte des supraconducteurs HTc (à haute température critique), d’intenses recherches ont été entreprises pour réaliser des JJ fonctionnant à la température de l’azote liquide (77 K) permettant l’utilisation d’une cryogénie compacte. Toutefois, la complexité de ces matériaux a longtemps rendu difficile le développement d’une technologie viable et simple à mettre en œuvre. Parmi les méthodes de fabrication de jonctions, celle utilisant l’irradiation par faisceau d’ions a atteint un niveau de maturité suffisamment important pour pouvoir envisager la production de circuits comportant plusieurs milliers de JJ à HTc.Le but de ma thèse repose sur la fabrication, la caractérisation et l’étude des propriétés électromagnétiques de réseaux de jonctions Josephson réalisés dans des films minces d’YBa2Cu3O7-d. par la méthode d’irradiation ionique. / The Josephson junction (JJ) is the basis of many compound superconducting electronic circuits (SQUID detectors millimeter wave RSFQ logic). With the discovery of HTS superconductors (high critical temperature), intensive research has been undertaken to make JJ operating at the temperature of liquid nitrogen (77 K) allowing the use of a compact cryogenics. However, the complexity of these materials has long hampered the development of a viable technology and simple to implement. Among the junctions manufacturing methods, one using the ion beam irradiation has reached a sufficiently high degree of maturity to be able to envisage the production of circuits having thousands of JJ to HTS.The aim of my thesis is based on the fabrication, characterization and study of the electromagnetic properties of Josephson arrays achieved in thin films of YBa2Cu3O7-d. by the ion irradiation method.

Thesis(MScEng)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: The SQUID-NMR technique has been increasingly recommended by many researchers as holding a lot of potential, and it is believed it will become an invaluable tool for non-destructive evaluation in the future. Most of its potential is yet to be exploited. Non-destructive quality control of food products is one of the applications where such a system is being tried. Much of the progress that has been made in improving such a system to the present degree of user friendliness and cost effectiveness shows that, with more effort, it would be possible to implement the technology for on-line sorting, and possibly to reduce it down to hand-held devices. The goal was to investigate the feasibility of the internal fruit quality measurements using the NMR technique, and to develop a SQUID system suitable for SQUID-NMR application, intended for a later integration in a full SQUID-NMR system. A working dc SQUID was manufactured on an YBCO (Y Ba2Cu3O7􀀀 ) thin film deposited on a 10 mm x 10 mm MgO substrate. The SQUID was made of microbridge Josephson junctions, patterned by using the double resist laser lithography method, implemented during the course of this manufacturing process. The test of the SQUID showed a non-hysteretic current-voltage characteristic. Under the action of bringing a magnet closer to the SQUID under test, and then retracting it, the modulation of the I-V curve was observed. The critical current of the SQUID was 20 A and the resistance was 5.5 A series of experiments were performed on destructive measurements of the sugar content in table grapes using NMR, in order to evaluate the feasibility of this technique. The total sugars(TSS) measurements of the same samples were carried out by refractometry, chosen as a conventional method for validation. The NMR measurements were evaluated to be 5.4% precise and have an accuracy of 9.3% relative to the refractometry measurements. A further series of experiments were carried out on a high-Tc SQUID-NMR system. A high correlation coefficient (0.85) of the increasing values of the T1 and T2 relaxation times to the decreasing concentration of sugar (sucrose) in water was obtained. Non-destructive measurements T1 and T2 in table grapes suggested a possible prediction of sugar content in table grapes from the values of T1 or T2. This technique also presented many advantages compared to the conventional high field NMR technique, such as the fast measurements that do not require spectral processing, the ease of sample preparation, and its non-destructive nature. / AFRIKAANSE OPSOMMING: Die SQUID-NMR tegniek word al hoe meer aanbeveel deur navorsers oor die groot potensiaal, en dit beloof om in die toekoms van onskatbare waarde te wees in nie vernietigende evaluering. Die potensiaal moet grotendeels nog ontgin word, en die nie vernietigende kwaliteitsbeheer van voedselprodukte is een van die toepassings wat hier getoets word. Die vooruitgang tot dusver om die stelsel te verbeter wat die gebruikersvriendelikheid en koste-effektiwiteit betref, toon dat met effens meer moeite dit moontlik sal wees om die tegnologie aan te pas vir lynsortering van vrugte, en om dit dalk ook as handtoestel beskikbaar te stel. Die vooruitgang tot dusver om die stelsel te verbeter wat die gebruikersvriendelikheid en koste-effektiwiteit betref, toon dat met effens meer moeite dit moontlik sal wees om die tegnologie aan te pas vir lynsortering van vrugte, en om dit dalk ook as handtoestel beskikbaar te stel. Die doel is om die uitvoerbaarheid van interne vrugtekwaliteit metings deur hierdie tegniek te ondersoek en om ’n SQUID stelsel te ontwikkel wat gepas is vir SQUIDNMR toepassing, met die doel om dit later in ’n volledige SQUID-NMR stelsel te kan integreer. ’n Werkende GS-SQUID is vervaardig op ’n YBCO dunfilm wat op ’n 10 mm x 10 mm MgO substraat gedeponeer is. Die SQUID is van mikro-brug Josephson aansluitings/ voegvlakke, waarop in die loop van die vervaardigingsproses ’n patroon m et dubbelweerstand laser litografie neergelê is. Toets van die SQUID het ’n niehisterese stroom-spanning as kenmerkend getoon. Die nader bring en terugtrekking van ’n magneet het gelei tot waarneming van die modulasie van die I-V kurwe. Die kritieke stroom van die SQUID was 20 A en die weerstand was 5.5 ohm. ’n Reeks eksperimente is uitgevoer oor vernietigende metings van die suikerinhoud van tafeldruiwe met gebruik van NMR, om die gangbaarheid van hierdie tegniek te evalueer. Totale suikers (TSS) metings van dieselfde monsters is uitgevoer deur refraktometrie, wat gekies is as gebruiklike metode vir geldigheidsbepaling. Die NMR metings is as 5.4% presies/noukeurig evalueer, en met ’n akkuraatheid van 9.3% teenoor die refraktometrie metingsyfers. ’n Verdere reeks eksperimente is uitgevoer op ’n hoë-Tc SQID-NMR stelsel. ’n Hoë korrelasiekoëffisiënt van 0.85 van die toenemende waardes van T1 en T2 ontspantye teenoor die afname in konsentrasie van sukrose in water is waargeneem. Nie-vernietigende metings van T1 eb T2 in tafeldruiwe het gelei tot die moontlikheid van gebruik van hierdie tegniek om suikerinhoud van tafeldruiwe te voorspel. Die tegniek het ook baie voordele getoon in teenstelling met die gebruiklike hoëveld NMR tegniek, onder andere dat hierdie metings vinniger is, nie verdere verwerking van die spektrum benodig nie, die maklike voorbereiding van die monsters en die nie-vernietigende aard van die proses.

No description available.

SiC has become an attractive wide bandgap semiconductor due to its unique physical and electronic properties and is widely used in high temperature, high frequency, high power and radiation resistant applications. SiC has been used as an alternative to Si in harsh environments such as in the oil industry, nuclear power systems, aeronautical, and space applications. SiC is also known for its polytypism and among them 3C-SiC, 4H-SiC and 6H-SiC are the most common polytypes used for research purposes. Among these polytypes 4H-SiC is gaining importance due to its easy commercial availability with a large bandgap of 3.26 eV at room temperature. Controlled creation of defects in materials is an approach to modify the electronic properties in a way that new functionality may result. SiC is a promising candidate for defect-induced magnetism on which spintronic devices could be developed. The defects considered are of room temperature stable vacancy types, eliminating the need for magnetic impurities, which easily diffuse at room temperature. Impurity free vacancy type defects can be created by implanting the host atoms of silicon or carbon. The implantation fluence determines the defect density, which is a critical parameter for defect induced magnetism. Therefore, we have studied the influence of low fluence low energy silicon and carbon implantation on the creation of defects in n-type 4H-SiC. The characterization of the defects in these implanted samples was performed using the techniques, RBS-channeling and Raman spectroscopy. We have also utilized these characterization techniques to analyze defects created in much deeper layers of the SiC due to implantation of high energy nitrogen ions. The experimentally determined depths of the Si damage peaks due to low energy (60 keV) Si and C ions with low fluences (< 1015 cm-2) are consistent with the SRIM-2011 simulations. From RBS-C Si sub-lattice measurements for different fluences (1.1×1014 cm-2 to 3.2×1014 cm-2) of Si implantation in 4H-SiC, the Si vacancy density is estimated to range from 1.29×1022 cm-3 to 4.57×1022 cm-2, corresponding to average vacancy distances of 4.26 Å to 2.79 Å at the damage peak (50±5 nm). Similarly, for C implanted fluences (1.85×1014 cm-2 to 1×1015 cm-2), the Si vacancy density varies from 1.37×1022 cm-3 to 4.22×1022 cm-3 with the average vacancy distances from 4.17 Å to 2.87 Å at the damage peak (110±10 nm). From the Raman spectroscopy, the implantation-induced lattice disorders calculated along the c-axis (LO mode) and perpendicular to c-axis (TO mode) in 4H-SiC are found to be similar. Furthermore, the results obtained from SQUID measurements in C implanted n-type 4H-SiC sample with fluences ranging from 1×1012 to 1.7×1016 ions/cm2 have been discussed. The implanted samples showed diamagnetism similar to the unimplanted sample. To date, to our best of knowledge, no experimental work has been reported on investigating defect induced magnetism for self-ion implantation in n-type 4H-SiC. These first reports of experimental results can provide useful information in future studies for a better understanding of self-ion implantation in SiC-based DMS.