Thickness dependence and dimensionality effects on charge and magnetic orderings in La1/3Sr2/3FeO3 thin films
Thickness dependence and dimensionality effects on charge and magnetic orderings in La1/3Sr2/3FeO3 thin films
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La1/3Sr2/3FeO3 薄膜中电荷和磁序的厚度依赖性和维度效应
DOI：
10.1103/physrevb.97.075134
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and H. Wadati
中科院分区：
文献类型：
--
作者：
K. Yamamoto;Y. Hirata;M. Horio;Y. Yokoyama;K. Takubo;M. Minohara;H. Kumigashira;Y. Yamasaki;H. Nakao;Y. Murakami;A. Fujimori;and H. Wadati
利用硬X射线和共振软X射线散射（RSXS）方法，系统地研究了Fe钙钛矿氧化物薄膜中电荷和磁性有序的厚度效应。我们发现磁有序沿着面内和面外方向的关联长度与厚度相当且成正比，并且比电荷有序的关联长度具有更强的厚度依赖性.通过内禀厚度效应，当磁有序的关联长度减小到电荷有序的关联长度时，磁有序态消失。表面敏感掠入射RSXS显示，即使在表面区域的有序存在，这表明所观察到的有序不受表面效应，如氧空位。临界厚度在5-15 nm之间，对应4-11个反铁磁有序周期。这个临界值似乎是共同的其他铁磁氧化物薄膜。
We investigate the thickness effects on charge and magnetic orderings in Fe perovskite oxidethin films by hard x-ray and resonant soft x-ray scattering (RSXS) with changing thin-film thickness systematically. We found that the correlation lengths of the magnetic ordering along the in-plane and out-of-plane directions are comparable and proportional to the thickness, and show stronger thickness dependence than those of charge ordering. The magnetic ordered states disappear when the correlation length of magnetic ordering decreases to that of charge ordering through the intrinsic thickness effects. Surface-sensitive grazing-incident RSXS revealed that the orderings exist even in the surface region, which indicates that the observed orderings are not affected by surface effects like oxygen vacancies. Critical thickness is in 5–15 nm, which corresponds to 4–11 antiferromagnetic ordering period. This critical value seems to be common to other ferromagnetic oxide thin films.