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《工程(英文)》 >> 2020年 第6卷 第2期 doi: 10.1016/j.eng.2019.11.009

DyFe11Ti磁结构及其自旋重取向的中子衍射研究

a University Grenoble Alpes, Institut Néel du CNRS, 25 rue des Martyrs, Grenoble 38042, France
b Universidade Estadual do Rio Grande do Sul, Porto Alegre, RS 90010-191, Brasil

收稿日期: 2018-07-23 修回日期: 2019-02-03 录用日期: 2019-03-11 发布日期: 2019-11-22

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摘要

本文报道了通过中子粉末衍射探测DyFe11Ti的磁结构及其热演化规律。使用了变温中子衍射技术来测量磁矩及其取向的温度依赖性。Dy和Fe磁矩以反向平行的方式形成亚铁磁性耦合,其2 K时的易磁化方向是基面(a, b)内的[110]轴。随着温度的升高,该磁结构先后经历了两次自旋重取向现象。低温下,Dy磁矩较大,达到9.7μB,而在200 K时磁矩迅速下降到7.5μB。在Fe 8i位置观察到了最大的Fe磁矩。尽管磁结构发生了很大的变化,但在研究的温度范围内ThMn12型晶体结构一直保持不变。在第一阶段的自旋重取向温度(TSR1)时,观察到了易磁化轴的急剧倾斜;易磁化轴与晶体c轴之间的夹角从2 K的90°减小到200 K时的约20°(其中c轴是200 K以上的易磁化轴);同时Dy和Fe磁矩保持反向平行耦合。

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