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SUMMARY:Superconducting spin valves based on spiral magnets - Dr. Nataliya
  Pugach\, Lomonosov Moscow State University\, Russia 
DTSTART:20171122T141500Z
DTEND:20171122T150000Z
UID:TALK95971@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:Superconducting spintronics has emerged in the last decade as 
 a promising new field that seeks to open a new dimension for nanoelectroni
 cs by utilizing the internal spin structure of the superconducting Cooper 
 pair as a new degree of freedom. Currently\, the discipline finds itself a
 t the crossroads for developing first-generation devices. Among the basic 
 units of superconducting spintronics are the so-called superconducting spi
 n valves. These are nanodevices in which the superconducting current is co
 ntrolled through the spin degree by changing the magnetization of magnetic
  elements.\nWe propose a superconducting spin-triplet valve\, which consis
 ts of a superconductor and an itinerant magnetic material\, with the magne
 t showing an intrinsic non-collinear order characterized by a wave vector 
 that may be aligned in a few equivalent preferred directions under the con
 trol 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 behaviour. Our results indi
 cate that the spin-valve effect may be noticeable [1]. This bilayer may be
  used as a magnetic memory element for cryogenic nanoelectronics. It has t
 he following advantages in comparison to superconducting spin valves propo
 sed previously: (i) it contains only one magnetic layer\, which may be mor
 e 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.\n\n[1]  N. G. Pugach\, M. Safonchik\
 , T. Champel\, M. E. Zhitomirsky\, E. Lahderanta\, M. Eschrig\, and C. Lac
 roix. Appl. Phys. Lett. 111\, 162601 (2017).\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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