The University of Minnesota has sputtered a ‘topological insulator’ – a solid that conducts on its surface but not inside – avoiding the single crystal growth process or molecular beam epitaxy normally needed. Bismuth selenide (Bi2Se3) is the material, magnetron-sputtered into a thin film of particles <6nm across in hetero-structures with CoFeB – “Using the sputtering ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/good-old-sputtering-might-route-mram-2018-08/
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