Growth and characterization of ferromagnetic Fe-doped GaSb quantum dots with high Curie temperature

被引：2
|
作者：
Sriharsha, Karumuri [1 ]
Le Duc Anh [1 ,2 ]
Shimada, Yuuji [3 ]
Takahashi, Takuji [3 ,4 ]
Tanaka, Masaaki [1 ,4 ,5 ]
机构：
[1] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
[2] Univ Tokyo, Inst Engn Innovat, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
[3] Univ Tokyo, Inst Ind Sci, Meguro Ku, 4-6-1 Komaba, Tokyo 1538505, Japan
[4] Inst Nano Quantum Informat Elect, Meguro Ku, 4-6-1 Komaba, Tokyo 1538505, Japan
[5] Univ Tokyo, Ctr Spintron Res Network CSRN, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
来源：
APL MATERIALS | 2020年 / 8卷 / 09期
关键词：
NANOPARTICLES;
D O I：
10.1063/5.0017938
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report the structural and magnetic properties of the Fe-doped GaSb quantum dots (QDs) (nominal Fe concentration x = 4.7%-16.6%) grown on GaAs (001) substrates by molecular beam epitaxy. The QDs with nanometer-scale dimensions consist of two areas with different crystal structures, a zinc-blende GaAsSb wetting layer and a new phase of FeGaSb alloy that has a simple cubic lattice. The size and distribution of the QDs depend on the Fe concentration, as revealed by atomic force microscopy. Magnetic force microscopy measurements at zero applied magnetic field show the presence of ferromagnetism in the QDs at room temperature with an easy axis in the <mml:mfenced close="]" open="[">1<mml:mo><overbar></mml:mover>10</mml:mfenced> direction, which is consistent with magnetometry measurements. The Curie temperature in these QDs is very high (>400 K), which is promising for spintronic applications at room temperature.
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页数：7
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