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RARE-EARTH TRANSITION METAL COMPOUNDS: EXCHANGE INTERACTIONS AND TRANSITION METAL MOMENTS

E. Burzo1,* , L. Chioncel2

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
  2. Department of Physics, University of Nijmegen, 6500 GL, Nijmegen, The Netherlands

Abstract

Magnetic measurements and band structure calculations were performed on Gd(CoxNi1-x)2, Gd(CoxAl1-x)2, (GdxY1-x)Co2, YCo4-xNixB and (GdxY1-x)Ni5 compounds. The band structure calculations performed on Gd(CoxNi1-x)2 system show that the cobalt moments are little dependent on composition. The critical fields for the appearance of induced cobalt and nickel moments were determined. The R5d band polarizations in R–Co and R–Ni compounds where R is a magnetic rare–earth are the result of both local 4d–5d and 5d–3d short range exchange interactions. Both 5d and 4d band polarizations resulting from short range interactions show a linear dependence on the magnetizations of nearest neighbour transition metals atoms..

Keywords

Rare-earth metal compound, Gd-Co-Ni, Gd-Y-Co, Y-Co-Ni-B, Gd-Y-Ni, Exchange interactions, Transition metal moment, Band structure, Magnetic measurements.

Submitted at: June 4, 2004
Accepted at: June 22, 2004

Citation

E. Burzo, L. Chioncel, RARE-EARTH TRANSITION METAL COMPOUNDS: EXCHANGE INTERACTIONS AND TRANSITION METAL MOMENTS, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 917-924 (2004)