We prepared κ-Al2O3-type structured AlxFe2-xO3 films in the range of x = 0 – 1.70 deposited on SrTiO3(111) substrates and investigated their crystal structures and magnetic properties. All films could be stabilized in the κ-Al2O3-type orthorhombic phase, and the lattice parameters were found to be monotonically decreased with an increase in the Al content. Néel temperature of AlxFe2-xO3 films was found to decrease with an increase in Al content, until the Al1.70Fe0.30O3 film showed paramagnetic behavior. On the other hand, saturation magnetization showed a maximum 0.79 μB/Fe at 10 K in the Al0.91Fe1.09O3 film, manifesting the preferential occupation of Al in the tetrahedral site. Cross sectional TEM observation has revealed the columnar growth of AlxFe2-xO3 films with an average width of ∼10 nm on the bottom layer that may have a similar cation arrangement with a bixbyite-type structure.
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7 July 2017
Research Article|
July 05 2017
Crystal structure and magnetism in κ-Al2O3-type AlxFe2-xO3 films on SrTiO3(111)
Yosuke Hamasaki;
Yosuke Hamasaki
1
Laboratory for Materials and Structures, Tokyo Institute of Technology
, 4259-J2-19, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Takao Shimizu;
Takao Shimizu
2
School of Materials and Chemical Technology, Tokyo Institute of Technology
, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Shintaro Yasui
;
Shintaro Yasui
a)
1
Laboratory for Materials and Structures, Tokyo Institute of Technology
, 4259-J2-19, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Takahisa Shiraishi;
Takahisa Shiraishi
3
Institute for Materials Research, Tohoku University
, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Akihiro Akama;
Akihiro Akama
3
Institute for Materials Research, Tohoku University
, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Takanori Kiguchi;
Takanori Kiguchi
3
Institute for Materials Research, Tohoku University
, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Tomoyasu Taniyama;
Tomoyasu Taniyama
1
Laboratory for Materials and Structures, Tokyo Institute of Technology
, 4259-J2-19, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Mitsuru Itoh
Mitsuru Itoh
b)
1
Laboratory for Materials and Structures, Tokyo Institute of Technology
, 4259-J2-19, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Yosuke Hamasaki
1
Takao Shimizu
2
Shintaro Yasui
1,a)
Takahisa Shiraishi
3
Akihiro Akama
3
Takanori Kiguchi
3
Tomoyasu Taniyama
1
Mitsuru Itoh
1,b)
1
Laboratory for Materials and Structures, Tokyo Institute of Technology
, 4259-J2-19, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
2
School of Materials and Chemical Technology, Tokyo Institute of Technology
, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
3
Institute for Materials Research, Tohoku University
, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
a)
E-mail: [email protected]
b)
E-mail: [email protected]
J. Appl. Phys. 122, 015301 (2017)
Article history
Received:
April 20 2017
Accepted:
June 13 2017
Citation
Yosuke Hamasaki, Takao Shimizu, Shintaro Yasui, Takahisa Shiraishi, Akihiro Akama, Takanori Kiguchi, Tomoyasu Taniyama, Mitsuru Itoh; Crystal structure and magnetism in κ-Al2O3-type AlxFe2-xO3 films on SrTiO3(111). J. Appl. Phys. 7 July 2017; 122 (1): 015301. https://doi.org/10.1063/1.4990947
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