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Ni Magnetic Anisotropy Model
Author(s) -
Mitsek A. I.,
Mitsek V. A.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199702)199:2<549::aid-pssb549>3.0.co;2-e
Subject(s) - condensed matter physics , covalent bond , spins , ion , anisotropy , electron , magnetic anisotropy , magnon , magnetization , chemical bond , physics , anisotropy energy , chemistry , magnetic field , ferromagnetism , quantum mechanics
Abstract We research the influence of spins σ of itinerant 4s‐electrons and 3d‐holes on chemical (metallic and covalent) bonds in f.c.c. Ni. The variational method is used to calculate the concentriations ( P n ) of d n ‐ions, in which 0 ≤ n ≤ 2 holes take part in covalent bond and there are (2 — n ) magnetic holes. The coupled spectra of band electrons and chemical bond fluctuations (CBF) give the entropy part of quasichemical free energy and mixing energy of d n ‐ions. The part P 0 ( T ) of d 0 ‐ions with spin S = 1 quickly decreases with the growth of temperature T . We also explain the observed deviations of magnetization M ( T ) from the Bloch law and the magnetic anisotropy constant K 1 ( T ) from the Akulov‐Zener law. The Hamiltonian of the new mechanism of indirect d–d exchange through covalent holes and magnetic relaxation with magnon–CBF scattering is deduced.