Tunable surface magnetism by gate voltage in a slab of nonmagnetic half-Heusler compound CoTiSb

The electrical manipulation of magnetization is appealing to the relevant experiment and spintronic device. In this paper, we focus on the electrical and magnetic properties of a thin film cleaved from the nonmagnetic half-Heusler compound CoTiSb. By means of the first-principles calculations, we fi...

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Bibliographic Details
Published in:The Journal of chemical physics 2023-02, Vol.158 (6), p.064705-064705
Main Authors: Sun, He, Jiang, Liwei, Zheng, Yisong
Format: Article
Language:English
Subjects:
Curie temperature
Ferrimagnetism
First principles
Magnetic moments
Magnetic properties
Magnetism
Physics
Spin valves
Thin films
Unit cell
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Summary:The electrical manipulation of magnetization is appealing to the relevant experiment and spintronic device. In this paper, we focus on the electrical and magnetic properties of a thin film cleaved from the nonmagnetic half-Heusler compound CoTiSb. By means of the first-principles calculations, we find that the surface of TiSb termination possesses ferrimagnetism with a magnetic moment of 0.35 (0.49) μB per unit cell without (with) Hubbard U, which can persist below the Curie temperature of 48 (54) K. What is more, such a surface magnetism can be tuned to nonmagnetism by gate-induced hole doping with a concentration of 2.83 × 1014 (3.55 × 1014) cm−2. This magnetic tunability of the CoTiSb slab provides a platform to realize the pseudo-spin valve with both the magnetic electrodes and nonmagnetic space layer made of the same material without hetero-interfaces.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0136807