Review on spintronics: Principles and device applications

https://www.tandfonline.com/doi/pdf/10.1080/14686996.2020.1812364

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

Is iridium demand a potential bottleneck in the realization of large-scale PEM water electrolysis?

Following the success and relevance of the 2014 and 2017 Magnetism Roadmap articles, this 2020 Magnetism Roadmap edition takes yet another timely look at newly relevant and highly active areas in magnetism research The overall layout of this article is hereby unchanged, given that it is very suitable to convey the most relevant aspects of today's magnetism research in a wide variety of sub-fields to a broad readership Again, a different group of experts has been selected, representing both the novelty of new research areas as well as the desire to incorporate different voices and viewpoints The latter is especially relevant for this type of article, in which one's field of expertise has to be accommodated on two printed pages only, so that personal selection preferences are naturally rather more visible than in other types of articles Most importantly, the very relevant advances in the field of magnetism research during the past years make yet another Magnetism Roadmap a very sensible and timely endeavour, and allow its authors and readers to take another broad-based, but concise look at the most significant developments in magnetism, their precise status, their challenges and their anticipated future developments

/pdf/the-2020-magnetism-roadmap-4649wvshns.pdf

The 2020 magnetism roadmap

Heusler Alloys: Past, Properties, New Alloys, And Prospects

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 compounds 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 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.

https://iopscience.iop.org/article/10.1088/1361-6463/aa88f4/pdf

Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material

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Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material