Co-Substitution Effect in Room-Temperature Ferromagnetic Oxide Sr3.1Y0.9Co4O10.5

Materials

Yoshiaki Kinemuchi¹  Asaya Fujita¹  Akihiro Tsuruta¹  Masashi Mikami¹  Shuji Kawasaki¹  Ichiro Terasaki¹  Yoshitake Masuda¹ 

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

关键词: cobalt oxide;    elemental substitution;    room temperature ferromagnetism;    spin state;   

DOI  :  10.3390/ma13102301

来源: DOAJ

【 摘 要 】

We investigated the Co substitution effect for the magnetic properties in room-temperature ferromagnetic oxide Sr_3.1Y_0.9Co₄O_10.5. The substituted element (Al and Ga) and low-spin state Co³⁺, 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. Al³⁺ preferentially substituted for intermediate-spin-state Co³⁺ in the ferrimagnetic CoO₆ layer and deteriorated the saturation magnetization of Sr_3.1Y_0.9Co₄O_10.5. By contrast, Ga³⁺ substituted for high-spin-state Co³⁺ in the CoO₆ layer and/or the antiferromagnetic CoO_4.25 layer and enhanced the saturation magnetization per Co ion. These results indicate that the magnetic properties of Sr_3.1Y_0.9Co₄O_10.5 can be controlled by selectively substituting for Co³⁺ with different spin states.

【 授权许可】

Unknown