室温铁磁氧化物SrYCoO中的共取代效应

Co-Substitution Effect in Room-Temperature Ferromagnetic Oxide SrYCoO.

作者信息

Tsuruta Akihiro, Kawasaki Shuji, Mikami Masashi, Kinemuchi Yoshiaki, Masuda Yoshitake, Fujita Asaya, Terasaki Ichiro

机构信息

National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan.

Department of Physics, Nagoya University, Furo-cho, Chuikusa-ku, Nagoya 464-8602, Japan.

出版信息

Materials (Basel). 2020 May 16;13(10):2301. doi: 10.3390/ma13102301.

DOI:10.3390/ma13102301

PMID:32429414

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7288105/

Abstract

We investigated the Co substitution effect for the magnetic properties in room-temperature ferromagnetic oxide SrYCoO. The substituted element (Al and Ga) and low-spin state Co, which was changed from a high-spin or intermediate-spin state by Al or Ga substitution, reduced the Curie temperature to even 1.5 times lower than the temperature estimated from a simple dilution effect. Al preferentially substituted for intermediate-spin-state Co in the ferrimagnetic CoO layer and deteriorated the saturation magnetization of SrYCoO. By contrast, Ga substituted for high-spin-state Co in the CoO layer and/or the antiferromagnetic CoO layer and enhanced the saturation magnetization per Co ion. These results indicate that the magnetic properties of SrYCoO can be controlled by selectively substituting for Co with different spin states.

摘要

我们研究了Co替代对室温铁磁氧化物SrYCoO磁性能的影响。替代元素（Al和Ga）以及通过Al或Ga替代从高自旋或中间自旋态转变为低自旋态的Co，使居里温度降低至甚至比根据简单稀释效应估计的温度低1.5倍。Al优先替代亚铁磁CoO层中处于中间自旋态的Co，并使SrYCoO的饱和磁化强度降低。相比之下，Ga替代CoO层和/或反铁磁CoO层中处于高自旋态的Co，并提高了每个Co离子的饱和磁化强度。这些结果表明，可以通过选择性地用不同自旋态的Co进行替代来控制SrYCoO的磁性能。