Phys.org January 8, 2018 The ability to develop SQUID-based quantum computers will require the stored magnetic data survive for long times. Theory calculations by a team of researchers in the US (University of Wisconsin–Madison, Argonne National Laboratory, UC Irvine, NIST-Colorado), showed that adsorbed molecular oxygen on the surfaces is the dominant contributor to magnetic noise for superconducting niobium and aluminum thin films. They found that surface treatment with ammonia and improving the sample vacuum environment dramatically reduced the surface contamination (to less than one oxygen molecule per 10 nm2), minimizing magnetic noise. Their work provides a design strategy for the […]
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Researchers demonstrate the existence of a new kind of magnetoresistance involving topological insulators
Phys.org January 10, 2018 Recently unidirectional spin Hall magnetoresistance was reported in a conventional metal bilayer material system. A team of researchers in the US (University of Minnesota, Pennsylvania State University) demonstrated the existence of such magnetoresistance in the topological insulator-ferromagnet bilayers and showed that the adoption of topological insulators, compared to heavy metals, doubles the magnetoresistance performance at 150 Kelvin (-123.15 Celsius). The research could improve the future of low-power computing and memory for the semiconductor industry, including brain-like computing and chips for robots and 3D magnetic memory…read more. Open Access TECHNICAL ARTICLE