Modified mean-field model for rare-earth--iron amorphous alloys

Journal Article · Tue Jun 01 04:00:00 EDT 1976 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.322982· OSTI ID:7290341

Heiman, N; Lee, K; Potter, R I; Kirkpatrick, S

A mean-field model of the magnetic properties of amorphous rare-earth--iron alloys has been developed which incorporates an Fe spin whose dependence on both the concentration and the species of rare earth is based on Mossbauer spectra. Using this model with a single fixed set of exchange constants, we have been able to calculate Curie temperatures which are in reasonable agreement with the data for amorphous rare-earth (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu--iron alloys containing between 50 and 100 at.% iron. Better agreement with the measured Curie temperatures is achieved if the magnitudes of the Fe-Fe and rare-earth--Fe exchange constants are allowed to increase linearly with rare-earth concentration. The latter case has the additional advantage of reproducing the observed shape of the magnetization-vs-temperature curves for wide range of composition and rare-earth species. (AIP)

• Research Organization: IBM Research Laboratory, San Jose, California 95193
• OSTI ID: 7290341
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 47:6; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
ANGULAR MOMENTUM
CHEMICAL COMPOSITION
CURIE POINT
DYSPROSIUM ALLOYS
ERBIUM ALLOYS
GADOLINIUM ALLOYS
HOLMIUM ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
LUTETIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIZATION
MOESSBAUER EFFECT
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SPIN
TEMPERATURE DEPENDENCE
TERBIUM ALLOYS
THERMODYNAMIC PROPERTIES
THULIUM ALLOYS
TRANSITION TEMPERATURE
YTTERBIUM ALLOYS