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Title: Rare-earth contribution to the magnetocrystalline anisotropy energy in R/sub 2/Fe/sub 14/B

Abstract

The zero-temperature value of the magnetocrystalline anisotropy (MCA) energy of trivalent rare-earth ions and its temperature dependence have been calculated for the whole series of the R/sub 2/Fe/sub 14/B compounds. The computations, performed with a single-ion origin of the anisotropy and within a molecular-field approximation, reveal a large local anisotropy of the rare-earth ion, 2 orders of magnitude larger than the iron anisotropy. The crystal field acting on the rare-earth ions is of comparable magnitude as the molecular field. As a consequence, the internal ferro- and ferrimagnetic structures are very sensitive to applied external magnetic fields leading to large bending angles between the rare-earth and iron sublattice magnetizations. The calculated values for the intrinsic anisotropy constants of Dy/sub 2/Fe/sub 14/B reproduce, within a two-sublattice model, the observed value of 20 T for the apparent anisotropy field at 4.2 K. The calculated values of the local MCA energy at zero temperature and room temperature are in good agreement with the experimentally determined data.

Authors:
;
Publication Date:
Research Org.:
Natuurkundig Laboratorium der Universiteit van Amsterdam, Valckenierstraat 65, 1018chemically bondXE Amsterdam, The Netherlands
OSTI Identifier:
5619505
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 36:16
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BORIDES; MAGNETIC PROPERTIES; RARE EARTH COMPOUNDS; ANISOTROPY; CRYSTAL FIELD; CRYSTALLOGRAPHY; TEMPERATURE DEPENDENCE; BORIDES; BORON COMPOUNDS; IRON COMPOUNDS; PHYSICAL PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Radwan-acute-accentski, R J, and Franse, J J.M. Rare-earth contribution to the magnetocrystalline anisotropy energy in R/sub 2/Fe/sub 14/B. United States: N. p., 1987. Web.
Radwan-acute-accentski, R J, & Franse, J J.M. Rare-earth contribution to the magnetocrystalline anisotropy energy in R/sub 2/Fe/sub 14/B. United States.
Radwan-acute-accentski, R J, and Franse, J J.M. Tue . "Rare-earth contribution to the magnetocrystalline anisotropy energy in R/sub 2/Fe/sub 14/B". United States.
@article{osti_5619505,
title = {Rare-earth contribution to the magnetocrystalline anisotropy energy in R/sub 2/Fe/sub 14/B},
author = {Radwan-acute-accentski, R J and Franse, J J.M.},
abstractNote = {The zero-temperature value of the magnetocrystalline anisotropy (MCA) energy of trivalent rare-earth ions and its temperature dependence have been calculated for the whole series of the R/sub 2/Fe/sub 14/B compounds. The computations, performed with a single-ion origin of the anisotropy and within a molecular-field approximation, reveal a large local anisotropy of the rare-earth ion, 2 orders of magnitude larger than the iron anisotropy. The crystal field acting on the rare-earth ions is of comparable magnitude as the molecular field. As a consequence, the internal ferro- and ferrimagnetic structures are very sensitive to applied external magnetic fields leading to large bending angles between the rare-earth and iron sublattice magnetizations. The calculated values for the intrinsic anisotropy constants of Dy/sub 2/Fe/sub 14/B reproduce, within a two-sublattice model, the observed value of 20 T for the apparent anisotropy field at 4.2 K. The calculated values of the local MCA energy at zero temperature and room temperature are in good agreement with the experimentally determined data.},
doi = {},
journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 36:16,
place = {United States},
year = {1987},
month = {12}
}