LaFe13-xSix合金中不同铁磁态磁化率与磁场诱导磁相变的临界磁场实验研究  

Experimental Studies of Magnetic Susceptibility for Different Ferromagnetic States and Critical Field for Field-Induced Magnetic Phase Transition in LaFe13-xSix Alloys

作　　者：陈湘[1,2] 陈云贵[2] 唐永柏[2] Chen Xiang;Chen Yungui;Tang Yongbo(Department of Physics and Electronic Informational Engineering,Neijiang Teachers College,Neijiang 641112,China;School of Materials Science and Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]内江师范学院物理与电子信息工程学院,四川内江641112 [2]四川大学材料科学与工程学院,四川成都610065

出　　处：《中国稀土学报》2019年第5期560-567,I0002,共9页Journal of the Chinese Society of Rare Earths

基　　金：四川省教育厅科研项目(16ZB0301)资助

摘　　要：通过对采用不同方法制备或热处理的LaFe13-xSi合金中处于不同磁状态的1:13相磁化过程的观察和分析,实验研究了该系合金中各种铁磁态的最大磁化率,以及磁场诱导顺磁态到铁磁态的巡游电子变磁相变临界磁场与温度的关系。结果表明,在居里温度以下合金中铁磁态的最大磁化率,高于居里温度以上因磁场诱导由顺磁态相变而来的铁磁态的最大磁化率。居里温度附近两相共存态中的顺磁态,由磁场诱导转变为铁磁态的临界磁场,小于居里温度以上合金处于完全顺磁态时由磁场诱导转变为铁磁态的临界磁场随温度变化的线性关系外推值。且在两相共存态中,因磁场诱导的铁磁态的最大磁化率也小于合金中本身存在的铁磁态的最大磁化率。另外,当合金中1:13相处于顺磁态和铁磁态两相共存时,经励磁-退磁至零场后转变为铁磁态,两相共存现象消失。Through observing the magnetization process of different ferromagnetic state in LaFe13.xSix alloys,the magnetic susceptibility for different ferromagnetic states and critical field for field-induced magnetic phase transition were experimentally studied.The results showed that the magnetic susceptibility of ferromagnetic state induced by temperature under Tc is higher than that induced by the magnetic field above In the two-phase coexistence state at the same temperature,the magnetic susceptibility of ferromagnetic state induced by temperature is also higher than that induced by the magnetic field.In addition,the phenomenon of two-phase coexistence disappears when the LaFe13_xSix alloys under two-phase coexistence are magnetized and then demagnetized to zero magnetic field.

关 键 词：一级相变 最大磁化率 磁畴 两相共存 稀土 

分 类 号：TG132.27[一般工业技术—材料科学与工程]