Theoretical Development in Itinerant Electron Ferromagnetism

International Workshop on Itinerant-Electron Magnetism

Takahashi, Yoshinori^1

Graduate School of Material Science, University of Hyogo, Kouto 3-2-1, Kamigori, Ako, Hyogo

678-1297, Japan^1

关键词: Curie Weiss law;    External magnetic field;    Fluctuation amplitudes;    Itinerant electrons;    Magnetization curves;    Spin fluctuation theory;    Temperature dependence;    Theoretical development;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/868/1/012002/pdf
DOI  :  10.1088/1742-6596/868/1/012002

来源: IOP

【 摘 要 】

In spite of the successful explanation of the Curie-Weiss law temperature dependence of the magnetic susceptibility, there exist some difficulties in the conventional spin fluctuation theory based on the expansion in powers of fluctuation amplitudes. They are now known to originate from the severe restriction on the magnetization curve. In this review, we show another approach based on the new ideas, i.e. the local spin amplitude conservation and the simultaneous treatment of temperature and external magnetic field dependences. We show various interesting magnetic properties are derived based on them and they are compared with experiments.