本論文分為兩部分，第一部分探討使用OOMMF磁性材料模擬軟體來模擬奈米線波導中的自旋波特性，除了以往文獻所熱門的水平異向性薄膜合金中的自旋波，還模擬了垂直異向性的材料，我們模擬了在奈米線一端施加0 ~ 100 GHz外加磁場的自旋波響應。在模擬的結果中，我們發現了水平異向性與垂直異向性的重要差別，垂直異向性比水平異向性波導在頻率小於10 GHz時，少了複雜的自旋波傳遞。而在改變線寬的條件中，我們發現了垂直異向性波導在線寬夠大時，會因退磁場的效應，使得磁矩翻轉，形成許多磁壁，而水平異向性材料則不會，從水平異向性波導大於120 nm線寬的波型中，則會發現自旋波在波導中產生破碎的相位改變。而模擬具有水平寬度變化與垂直厚度變化的週期性邊界，則發現兩者所具有的濾波效果非常相似，而濾波的三個頻段，則是水平寬度變化所截止的頻段，寬於垂直厚度變化的頻段。 第二部分為 ，使用離子濺鍍製成總厚度200 nm，改變交錯層數的(Co/Pt)×N、(Co/Pd) ×N與(Pt/Pd) ×N，三種多層膜的磁性電性分析。Co/Pt與Co/Pd多層膜在Co厚度小於1 nm時為熱門垂直異向性材料，而本實驗專注於Co厚度大於1 nm時介面的特性以及兩種材料的差別。在磁阻的量測上面，得到不同於一般異向性磁阻的規律，一般的異向性磁阻的現象為，平行於電流施加磁場比垂直電流施加磁場所量測的電阻，前者電阻較大(ρ_(H∥I)>ρ_(H⊥I))，但是同為垂直於電流的平行於膜面磁場的電阻(ρ_(H⊥I,in-plane H))與垂直膜面磁場(ρ_(H⊥I,H perpendicular to plane))則呈現了不一樣的行為，尤其為垂直加場的部分，在某些條件的多層膜，會有明顯的垂直方向的異向性磁阻，是為介面所造成額外的垂直方向異向性磁阻，稱作”異向性介面磁阻”(Anisotropic Interface Magnetoresistance)。異向性磁阻與異性向介面磁阻都具有高電阻軸與垂直此軸的低電阻平面，而兩者差別在於異向性磁阻為電流方向軸，而異向性介面磁阻為膜面法向量軸，對於本實驗的量測方法來說，兩軸相差90度角，也因此可辨析兩者不同現象間的差異，並且在我們的分析之中發現，異向性介面磁阻在Co厚度為7 nm以下，才會明顯的顯現。 / The thesis is divided into two main parts. The first part discusses the properties of spin waves propagation in magnetic nanowire waveguide by micromagnetic simulation software OOMMF. In addition to in-plane magnetic anisotropy (IMA) in the thin film alloys, we simulate the perpendicular magnetic anisotropy (PMA) of the material. A transverse magnetic field is applied at one end of the waveguide wire and the frequency range is from 0 to 100 GHz. When frequency is less than 10 GHz, we observed that complex modes were generated in the IMA waveguide but there is no spin wave propagates in the PMA waveguide. We also studied the spin wave propagations in wires with different width. Irregular domain wall was generated by demagnetizing field in wider PMA waveguide but IMA waveguide does not have this behavior. In width-modulated and thickness-modulated waveguide spin wave simulations, these two filters have similar results with three band gaps from 0 to 100 GHz and the band gaps in width-modulated wire is wider than in thickness-modulated one. The second part is experimental measurements of the electrical and magnetic properties of (Co/Pt)×N, (Co/Pd) ×N, and (Pt/Pd) ×N multilayers, which are deposited by sputtering and the total thickness is 200nm. Co/Pt and Co/Pd were popular PMA materials when Co thickness is less than 1 nm. We focused on the multilayers with Co thicker than 1nm and the difference between these multilayers. In magnetoresistance measurement, the R-H curve is different from normal anisotropic magnetoresistance (AMR). AMR effect has different resistivity when H∥I or H⊥I, but the measurement results show that ρ_(H⊥I,in-plane H) and ρ_(H⊥I,H perpendicular to plane) also have different MR ratio in specific multilayer configuration. The effect is caused by the interface so it is anisotropic interface magnetoresistance (AIMR) as discussed in the literature. AMR and AIMR have both high resistivity axis and low resistivity plane which is perpendicular to the axis. The difference of two MRs is that the high resistivity axis is parallel to current in AMR and perpendicular to plane in AIMR. In the analysis, the AIMR effect is observed in multilayer with Co thickness less than 7 nm.

The increasing demand for nearline storage capacity in data centers calls for a continued enhancement in hard disk drive recording density far beyond one terabit per square inch. The thermal stability limit forces the drive manufacturers to develop new concepts in order to achieve this in the long term. Potential solutions are microwave-assisted magnetic recording (MAMR), heat-assisted magnetic recording (HAMR) and bit-patterned media (BPM). A simple example of BPM based on sputter-deposited Co/Pd multilayers and prepatterned substrates at hypothetical recording densities up to one terabit per square inch was studied by magnetic force microscopy (MFM). This system achieved promising results at lower densities, but an actual application for data storage, especially at one terabit per square inch and higher densities, requires elaborate optimizations. For some time now, FePt thin films have attracted much attention as prospective recording layers for high-density magnetic data storage due to their high magnetic anisotropy. The use of FePt films in HAMR is especially promising. This application has been tested successfully by Seagate and its key customers in recent years and is about to be introduced into the nearline hard disk drive market. It requires a tuning of the magnetic properties of FePt, especially of its Curie temperature. The addition of Cu proved to be effective in this regard and can also facilitate the formation of the crucial L10 structure and (001) texture during rapid thermal annealing of sputter-deposited thin films. Such films were prepared as bilayers of Cu and FePt on Si substrates, annealed for 30 s, and analyzed by X-ray diffraction (XRD) and SQUID vibrating sample magnetometry (SQUID-VSM). The influence of large Cu additions on important properties like lattice parameters, mosaicity, magnetic anisotropy and Curie temperature is discussed. The chemical long-range order was calculated from the XRD data, and a dedicated chapter of this thesis covers the most important factors to be considered in such calculations for textured thin films and other samples. The feasibility of creating patterned Fe-Cu-Pt films with perpendicular magnetic anisotropy, as needed for a combination of HAMR and BPM, by deposition through a PMMA mask, a lift-off process and subsequent annealing was investigated as well. The results indicate that the chosen approach might not lead to the required (001) texture when the nanostructures are small enough to compete with today's recording densities, so that either a continuous film might need to be etched after annealing or a seed layer might be required to induce the texture.:1. Motivation: Magnetic Data Storage 2. Experimental Techniques 3. Co/Pd Multilayers on Prepatterned Substrates 4. Fe-Pt and Fe-Cu-Pt Alloys 5. Rapid Thermal Annealing of FePt and FePt/Cu Films 6. Order Parameter Calculation 7. Summary