Artificial control of the bias-voltage dependence of tunnelling-anisotropic magnetoresistance using quantization in a single-crystal ferromagnet

Iriya Muneta (), Toshiki Kanaki, Shinobu Ohya () and Masaaki Tanaka ()
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Iriya Muneta: The University of Tokyo
Toshiki Kanaki: The University of Tokyo
Shinobu Ohya: The University of Tokyo
Masaaki Tanaka: The University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract A major issue in the development of spintronic memory devices is the reduction of the power consumption for the magnetization reversal. For this purpose, the artificial control of the magnetic anisotropy of ferromagnetic materials is of great importance. Here, we demonstrate the control of the carrier-energy dependence of the magnetic anisotropy of the density of states (DOS) using the quantum size effect in a single-crystal ferromagnetic material, GaMnAs. We show that the mainly twofold symmetry of the magnetic anisotropy of DOS, which is attributed to the impurity band, is changed to a fourfold symmetry by enhancing the quantum size effect in the valence band of the GaMnAs quantum wells. By combination with the gate electric-field control technique, our concept of the usage of the quantum size effect for the control of the magnetism will pave the way for the ultra-low-power manipulation of magnetization in future spintronic devices.

Date: 2017
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DOI: 10.1038/ncomms15387

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