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Magnetic properties of Single Crystal GaFeO3

Published online by Cambridge University Press:  21 January 2019

Koki Tachiyama ,
Shintaro Yasui ,
Badari Narayana Aroor Rao ,
Takuro Dazai ,
Takamasa Usami ,
Tomoyasu Taniyama ,
Tsukasa Katayama ,
Yosuke Hamasaki ,
Jianding Yu  and
Huan He
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Koki Tachiyama
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
Shintaro Yasui
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
Badari Narayana Aroor Rao
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
Takuro Dazai
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
Takamasa Usami
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
Tomoyasu Taniyama
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
Tsukasa Katayama
Affiliation:
Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo113-0033, Japan
Yosuke Hamasaki
Affiliation:
Department of Applied Physics, National Defence of Academy, Yokosuka239-8686, JAPAN
Jianding Yu
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, P.R. China200050
Huan He
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, P.R. China200050
Hui Wang
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, P.R. China200050
Mitsuru Itoh*
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama226-8503, Japan
*
*(Email: [email protected])
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Abstract

κ-Al2O3-type GaFeO3 is a promising multiferroic material due to the coexistence of a large spontaneous magnetization and polarization near room temperature. In the current study, we present the magnetic properties of single crystalline GaFeO3 and compare it with that of ε-Fe2O3. Magnetic measurements revealed that spontaneous magnetization appears below 540 K in two steps, similar to that reported for ε−Fe2O3. Partial magnetic ordering takes place at 540 K (TN1), with Fe3+ ions in two distorted octahedral sites ordering antiparallel to one another. Upon further cooling at 200 K (TN2), the remaining Fe3+ ions in regular octahedra and tetrahedra order antiparallel to one another. Substitution of Ga for Fe in ε-Fe2O3 leads to a decrease in TN1 and TN2 from 850 to 540 K and from 480 to 200 K, respectively, caused by a dilution of magnetic Fe by nonmagnetic Ga and preferential site occupation of Ga.

Keywords

magnetic propertiesoxide
Type
Articles
Information
MRS Advances , Volume 4 , Issue 1: Characterization, Mechanical Properties and Structure-Property Relationships , 2019 , pp. 61 - 66
Copyright
Copyright © Materials Research Society 2019 

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References

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