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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Transport and magnetic properties of rtx and related

Goruganti, Venkat 15 May 2009 (has links)
Physical properties of RTX compounds (R = Rare earth, T = Transition metal and X = main group element from B, C or N group) compounds have been studied by means of electrical resistivity, heat capacity, dc magnetization and NMR. Searching for new magnetic materials is always an interesting topic from both a technological and basic research prospective; it is even more interesting when unusual magnetic phases are observed. Ternary intermetallic plumbides are interesting because of their unconventional magnetic ordering and variety of multiple magnetic transitions. Crystalline electric fields (CEF) also strongly effect the magnetic properties of these intermetallics. To understand the phase transitions, CEF effects, and magnetic interactions, a systematic study of the RNiPb, R2Ni2Pb, R5NiPb3 and RCuGe systems were conducted. Among the results for NdNiPb a single antiferromagnetic transition was found at 3.5K, while the superconductivity found in some ingots of this material was shown not to correspond to a bulk behavior for this phase. Nd2Ni2Pb was shown to have a canted zero field magnetic structure with a low temperature metamagnetic transition 3 T. In NdCuGe, a 3K AF transition was found along with a corresponding magnon contribution to the specific heat and magnetic and thermodynamic behavior from which the detailed CEF configuration was obtained. In a series of measurements on recently-synthesized R5NiPb3 (R=Ce, Nd, Gd), for Ce5NiPb3 a transition at 48 K was found, which was confirmed to be ferromagnetic character from field dependent heat capacity and Curie-Weiss susceptibility. Nd5NiPb3 exhibits two transitions, an antiferromagnetic transition at 42 K and an apparently weak ferromagnetic canting transition at 8 K. For Gd5NiPb3, a ferro- or ferrimagnetic transition was found at 68 K. For the Ce and Nd materials metamagnetism was also observed at low temperatures. In addition, very large metallic type y terms were found in the specific heat, as well as a reduced value of the magnetic entropy, for all three systems. These results imply a lack of ordering for one of the two in-equivalent chains in these materials. This is discussed in terms of possible geometrical frustration on one of the spin chains.
2

Paramagnetische relaxatieverschijnselen bij lage temperaturen ...

Du Pré, Frits Karel. January 1900 (has links)
Proefschrift--Leyden. / Summary in English. "Literatuur": p. [85]-86.
3

Investigations on magnetic fields with reference to ore-concentration ...

Crane, Walter R. January 1900 (has links)
Thesis (Ph. D.)--Columbia University. / Pub. also as Transactions of the American Institute of mining engineers, 1902 vol. XXXI, p. 405-446. MIU copy has thesis note on cover-title, "Transactions of the American institute of mining engineers" at head of caption title.
4

Beschouwingen en metingen over de paramagnetische relaxatie

Broer, L. J. F. January 1945 (has links)
Proefschrift--Amsterdam. / "Summary" (in English): p. [161]-163. "Literatuur": p. [164]-167.
5

The influence of interlayer exchange coupling on magnetic ordering in Fe-based heterostructures /

Pärnaste, Martin, January 2007 (has links)
Diss. (sammanfattning) Uppsala : Uppsala universitet, 2007. / Härtill 6 uppsatser.
6

A Structural viewpoint of magnetism in Fe and Co based superlattices /

Björck, Matts, January 2007 (has links)
Diss. (sammanfattning) Uppsala : Uppsala universitet, 2007. / Härtill 10 uppsatser.
7

Spin dynamics and magnetic multilayers /

Skubic, Björn, January 2007 (has links)
Diss. (sammanfattning) Uppsala : Univ., 2007. / Härtill 17 uppsatser.
8

Chemical tuning of the magnetic interactions in layer structures /

Ronneteg, Sabina, January 2005 (has links)
Diss. (sammanfattning) Uppsala : Uppsala universitet, 2005. / Härtill 8 uppsatser.
9

Magnetic heterostructures : the effect of compositional modulation on magnetic properties /

Soroka, Inna, January 2005 (has links)
Diss. (sammanfattning) Uppsala : Uppsala universitet, 2005. / Härtill 9 uppsatser.
10

Synthesis, nuclear structure, and magnetic properties of some perovskite oxides /

Tseggai, Mehreteab, January 2005 (has links)
Diss. (sammanfattning) Uppsala : Uppsala universitet, 2005. / Härtill 4 uppsatser.

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