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29 March 2024
 
  » arxiv » 1702.8828

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Superconducting spin valves controlled by spiral re-orientation in MnSi
N. G. Pugach ; M. Safonchik ; T. Champel ; M. E. Zhitomirsky ; E. Lähderanta ; M. Eschrig ; C. Lacroix ;
Date 28 Feb 2017
AbstractWe propose a superconducting spin-triplet valve of a new type. This spin valve consists of a bilayer that involves a superconductor and an itinerant magnetic material, with the magnet showing an intrinsic non-collinear magnetic order characterized by a wave vector ${f Q}$ that may be aligned in a few equivalent preferred directions under control of a weak external magnetic field. Re-orienting the direction of ${f Q}$ allows one to controllably modify long-range spin-triplet superconducting correlations in the magnetic material, leading to spin-valve switching behavior. This new type of superconducting spin valve may be used as a magnetic memory element for cryogenic nanoelectronics. It has the following advantages in comparison with superconducting spin valves proposed earlier: (i) it contains only one magnetic layer, which may be more easily fabricated and controlled; (ii) its ground states are separated by a potential barrier, which solves the "half-select" problem of the addressed switch of such memory elements.
Source arXiv, 1702.8828
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