Ni Magnetic Anisotropy Model

Autor: A. I. Mitsek, V. A. Mitsek
Rok vydání: 1997
Předmět:
Zdroj: physica status solidi (b). 199:549-562
ISSN: 1521-3951
0370-1972
DOI: 10.1002/1521-3951(199702)199:2<549::aid-pssb549>3.0.co;2-e
Popis: 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.
Databáze: OpenAIRE
Externí odkaz: