Green's function approach of an anisotropic Heisenberg ferrimagnetic system
Küçük Resim Yok
Tarih
2013
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ELSEVIER SCIENCE BV
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
We have investigated the influence of the exchange anisotropy parameter on the magnetization, critical and compensation temperatures and susceptibility of the anisotropic Heisenberg ferrimagnetic system with the single-ion anisotropy under an external magnetic field using the double-time temperature-dependent Green's function theory. In order to decouple the higher order Green's functions, Anderson-Callen's decoupling and random phase approximations have been used. This model is useful for understanding the temperature dependence of total magnetization of Lithium-chromium ferrites Li0.5Fe1.25Cr1.25O4 for which negative magnetization is characteristic. We observe that the critical temperature increases when the exchange anisotropy increases. When the system is under an external magnetic field, one obtains the first-order phase transition where the magnetization jumps for all the values of the exchange anisotropy parameters. (c) 2013 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Anisotropic Heisenberg model, Ferrimagnetic system, Green's function, Compensation point
Kaynak
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
347
