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Heusler alloys for spintronic devices: review on recent development and future perspectives

Authors :
Kelvin Elphick
William Frost
Marjan Samiepour
Takahide Kubota
Koki Takanashi
Hiroaki Sukegawa
Seiji Mitani
Atsufumi Hirohata
Source :
Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 235-271 (2021)
Publication Year :
2021
Publisher :
Taylor & Francis Group, 2021.

Abstract

Heusler alloys are theoretically predicted to become half-metals at room temperature (RT). The advantages of using these alloys are good lattice matching with major substrates, high Curie temperature above RT and intermetallic controllability for spin density of states at the Fermi energy level. The alloys are categorised into half- and full-Heusler alloys depending upon the crystalline structures, each being discussed both experimentally and theoretically. Fundamental properties of ferromagnetic Heusler alloys are described. Both structural and magnetic characterisations on an atomic scale are typically carried out in order to prove the half-metallicity at RT. Atomic ordering in the films is directly observed by X-ray diffraction and is also indirectly probed via the temperature dependence of electrical resistivity. Element specific magnetic moments and spin polarisation of the Heusler alloy films are directly measured using X-ray magnetic circular dichroism and Andreev reflection, respectively. By employing these ferromagnetic alloy films in a spintronic device, efficient spin injection into a non-magnetic material and large magnetoresistance are also discussed. Fundamental properties of antiferromagnetic Heusler alloys are then described. Both structural and magnetic characterisations on an atomic scale are shown. Atomic ordering in the Heusler alloy films is indirectly measured by the temperature dependence of electrical resistivity. Antiferromagnetic configurations are directly imaged by X-ray magnetic linear dichroism and polarised neutron reflection. The applications of the antiferromagnetic Heusler alloy films are also explained. The other non-magnetic Heusler alloys are listed. A brief summary is provided at the end of this review.

Details

Language :
English
ISSN :
14686996 and 18785514
Volume :
22
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Science and Technology of Advanced Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.142bb71960bc46c98ad4f45a8f4a2569
Document Type :
article
Full Text :
https://doi.org/10.1080/14686996.2020.1812364