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Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan
抄録
Mn3O4 nanoparticles with particle sizes of 7.8, 11.4, and 18.3 nm were synthesized in the pores of mesoporous silica, and their crystal structure and magnetic properties were investigated. The powder X-ray diffractions at room temperature indicated that the crystal structural symmetry was the same as that for bulk crystal, and the lattice constants deviated from those for bulk crystal, which depended on the particle size. In addition, compared with the bulk crystal, the Jahn-Teller distortion for the nanoparticles was suppressed and decreased with decreasing the particle size. The coercive field for 7.8 nm was rather smaller than those for 11.4 and 18.3 nm. The nanoparticles with 11.4 and 18.3 nm exhibited pronounced three kinds of magnetic transition temperatures, whereas the susceptibility for 7.8 nm indicated the existence of two transition temperatures. These experimental results suggested that the Mn3O4 nanoparticles have a strong correlation between crystallographic structure and magnetic property, and the characteristic magnetic size effects are attributed to the reduction of Jahn-Teller distortion.
内容記述
The 21st International Conference on Magnetism (ICM2018), July 15-20, 2018, San Francisco, USA
雑誌名
IEEE Transactions on Magnetics
巻
55
号
2
発行年
2018-07-17
出版者
Institute of Electrical and Electronics Engineers
ISSN
0018-9464
1941-0069
書誌レコードID
AA00667933
DOI
http://dx.doi.org/10.1109/TMAG.2018.2859950
権利
Copyright (c) 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
その他のタイトル
SIZE EFFECTS ON MAGNETIC PROPERTY AND CRYSTAL STRUCTURE OF MN3O4 NANOPARTICLES IN MESOPOROUS SILICA
Size Effects on Magnetic Property and Crystal Structure of Mn3O4 Nanoparticles in Mesoporous Silica
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