Magnetic properties of amorphous Gd{sub 70}(Fe,Ni){sub 30} and Dy{sub 70}(Fe, Ni){sub 30} alloys

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:476733

Liu, X Y; Barclay, J A ^[1]; Gopal, B R ^[2]

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1. Univ. of Victoria, British Columbia (Canada)
2. Universite du Quebec (Canada); and others

The unique physical and mechanical properties of amorphous materials make them attractive for magnetic refrigeration applications. In an effort to develop advanced magnetic refrigerants, the magnetic properties of amorphous Gd{sub 70}(Fe,Ni){sub 30} and DY{sub 70}(Fe,Ni){sub 30} alloys were investigated. The combination of 70 at.% Gd or Dy with different ratios of Fe and Ni produced amorphous materials with ordering temperatures covering the range of 300 K to 35 K. The coercive forces of both Gd-based and Dy-based alloys were negligible near their ordering temperatures. The magnetization properties of the alloys as a function of temperature in applied fields up to 5.6 x 10{sup 6} A/m are presented. Magnetic entropy changes obtained from the field-dependent magnetization data are discussed. The broad nature of magnetic transitions in the amorphous alloys and its impact on the suitability of these materials as magnetic refrigerants are also discussed.

• OSTI ID: 476733
• Report Number(s): CONF-950722--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42A; ISSN 0065-2482; ISSN ACYEAC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
DYSPROSIUM BASE ALLOYS
ENTROPY
GADOLINIUM BASE ALLOYS
HYSTERESIS
IRON ALLOYS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC REFRIGERATORS
NICKEL ALLOYS
TEMPERATURE DEPENDENCE