Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material
Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material
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Date
2017
Authors
Hirohata, Atsufumi
Huminiuc, Teodor
Sinclair, John
Wu, Haokaifeng
Samiepour, Marjan
Vallejo-Fernandez, Gonzalo
O’Grady, Kevin
Balluf, Jan
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HARFIR- Heusler Alloy Replacement for Iridium
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Journal of Physics D : Applied Physics ; 50 (2017), 44. - 443001. - ISSN 0022-3727. - eISSN 1361-6463
Abstract
As a platinum group metal, iridium (Ir) is the scarcest element on the earth but it has been widely used as an antiferromagnetic layer in magnetic recording, crucibles and spark plugs due to its high melting point. In magnetic recording, antiferromagnetic layers have been used to pin its neighbouring ferromagnetic layer in a spin-valve read head in a hard disk drive for example. Recently, antiferromagnetic layers have also been found to induce a spin-polarised electrical current. In these devices, the most commonly used antiferromagnet is an Ir–Mn alloy because of its corrosion resistance and the reliable magnetic pinning of adjacent ferromagnetic layers. It is therefore crucial to explore new antiferromagnetic materials without critical raw materials. In this review, recent research on new antiferromagnetic Heusler alloys and their exchange interactions along the plane normal is discussed. These new antiferromagnets are characterised by very sensitive magnetic and electrical measurement techniques recently developed to determine their characteristic temperatures together with atomic structural analysis. Mn-based alloys and compounds are found to be most promising based on their robustness against atomic disordering and large pinning strength up to 1.4 kOe, which is comparable with that for Ir–Mn. The search for new antiferromagnetic films and their characterisation are useful for further miniaturisation and development of spintronic devices in a sustainable manner.
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530 Physics
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antiferromagnetic, Heusler alloys, iridium
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HIROHATA, Atsufumi, Teodor HUMINIUC, John SINCLAIR, Haokaifeng WU, Marjan SAMIEPOUR, Gonzalo VALLEJO-FERNANDEZ, Kevin O’GRADY, Jan BALLUF, Rocio YANES DÍAZ, Ulrich NOWAK, 2017. Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material. In: Journal of Physics D : Applied Physics. 50(44), 443001. ISSN 0022-3727. eISSN 1361-6463. Available under: doi: 10.1088/1361-6463/aa88f4BibTex
@article{Hirohata2017-09-27Devel-40575, year={2017}, doi={10.1088/1361-6463/aa88f4}, title={Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material}, number={44}, volume={50}, issn={0022-3727}, journal={Journal of Physics D : Applied Physics}, author={Hirohata, Atsufumi and Huminiuc, Teodor and Sinclair, John and Wu, Haokaifeng and Samiepour, Marjan and Vallejo-Fernandez, Gonzalo and O’Grady, Kevin and Balluf, Jan and Yanes Díaz, Rocio and Nowak, Ulrich}, note={Article Number: 443001} }
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