Green's function approach of an anisotropic Heisenberg ferrimagnetic system

Küçük Resim Yok

Tarih

2013

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

Sayı

Künye