journal article·2020-09-01Open access

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

Karumuri Sriharsha, Le Duc Anh, Yuuji Shimada, Takuji Takahashi, Masaaki Tanaka

APL Materials· Volume 8· Issue 9

Abstract

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 1¯10 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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Research context

OpenAlex topics: Semiconductor Quantum Structures and Devices · ZnO doping and properties · Quantum and electron transport phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical Engineering and Information Systems, The University of Tokyo 1 , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

Institute of Engineering Innovation, The University of Tokyo 2 , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

Institute of Industrial Science, The University of Tokyo 3 , 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan

Institute for Nano Quantum Information Electronics 4 , 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan

Center for Spintronics Research Network (CSRN), The University of Tokyo 5 , 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

Funding

Spintronics Research Network of Japan · Precursory Research for Embryonic Science and Technology · Core Research for Evolutional Science and Technology · Grants-in-Aid for Scientific Research

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