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Title: Magnetic properties of amorphous rare-earth alloys
Author: Samadian, Vahab
ISNI:       0000 0001 3547 9101
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 1986
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The magnetic properties of three amorphous rare-earth alloy systems have been studied in some detail. The first measurements were made on the binary system GdₓAg₁₀₀₋ₓ with 28 ≤ x ≤ 40. These alloys are ferromagnetic for x ≥ 28. In order to study the evolution of magnetic order as a function of Gd content it was necessary to go to a ternary alloy in which the glass forming properties are independent of the Gd content. The alloy system GdₓY₆₃₋ₓCu₃₇ was found to satisfy these requirements. These alloys are ferromagnetic for x ≥ 45 and show spin glass behaviour for x < 30. In the composition range 30 < x < 45 the nature of the ordered phase is not clear and the possibility of a mixture of two phases cannot be excluded. Finally inelastic neutron scattering was used to search for crystal field levels in amorphous R_5Y_58Cu_37 alloys in which R = Ce,Pr,Tb,Dy,Ho and Er. One of these, Er_5Y_58Cu_37, showed evidence of well defined crystal field levels despite the structural disorder. The results are discussed within the non-axial crystal field model.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Metallurgy & metallography