We propose a superconducting spin-triplet valve, which consists of a superconductor and an itinerant magnetic material, with the magnet showing an intrinsic non-collinear order characterized by a wave vector that may be aligned in a few equivalent preferred directions under the control of a weak external magnetic field. Re-orienting the spiral direction allows one to controllably modify long-range spin-triplet superconducting correlations, leading to spin-valve switching behavior. Our results indicate that the spin-valve effect may be noticeable. This bilayer may be used as a magnetic memory element for cryogenic nanoelectronics. It has the following advantages in comparison to superconducting spin valves proposed previously: (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 memory elements.
Superconducting spin valves controlled by spiral re-orientation in B20-family magnets
N. G. Pugach, M. Safonchik, T. Champel, M. E. Zhitomirsky, E. Lähderanta, M. Eschrig, C. Lacroix; Superconducting spin valves controlled by spiral re-orientation in B20-family magnets. Appl. Phys. Lett. 16 October 2017; 111 (16): 162601. https://doi.org/10.1063/1.5000315
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