The magnetic reorientation transition in thin ferromagnetic films treated by many-body Green's function theory

TL;DR

This paper investigates the temperature and external field-induced reorientation of magnetization in thin ferromagnetic films using many-body Green's function theory, providing an exact treatment of anisotropy and exchange interactions.

Contribution

It introduces a method employing a rotating frame and higher-order Green's functions for precise analysis of magnetization reorientation in thin films.

Findings

Exact treatment of single-ion anisotropy

Generalized Tyablikov decoupling for exchange interactions

Analysis of magnetization behavior under varying temperature and fields

Abstract

This contribution describes the reorientation of the magnetization of thin ferromagnetic Heisenberg films as function of the temperature and/or an external field. Working in a rotating frame allows an exact treatment of the single-ion anisotropy when going to higher-order Green's functions. Terms due to the exchange interaction are treated by a generalized Tyablikov (RPA) decoupling.