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SUMMARY:Coexistence of superconductivity and magnetism at the nanoscale - 
 Prof. Alexandre Buzdin\, University of Bordeaux
DTSTART:20180118T141500Z
DTEND:20180118T151500Z
UID:TALK82151@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:The main mechanisms of the interplay between magnetism and sup
 erconductivity and the coexistence between these two different long ranged
  orders in the bulk magnetic superconductors will be reviewed.  The antago
 nism of ferromagnetism with a singlet superconductivity leads to spectacul
 ar effects such as a re-entrant superconductivity and the nanoscopic domai
 n magnetic structure formation. In the case of the weak exchange interacti
 on (or triplet superconductivity)\, the competition between a self-induced
  vortex phase and a short-period domain structure may occur.\n\nThe very s
 pecial character of the proximity effect in superconductor-ferromagnet het
 erostructures is revealed in the damped oscillatory behaviour of the Coope
 r pair wave function. And the formation of the special π-Josephson juncti
 ons is possible. Such “π -junction” incorporated in a superconducting
  circuit may generate a spontaneous current. The quantum oscillations and 
 the “π”-states should also be present in multiply connected ferromagn
 et–superconductor hybrids\, for example in a thin-walled superconducting
  shell surrounding a ferromagnetic cylinder.\n\nThe proximity effect in S/
 F structures is usually short-ranged though it can become long ranged when
  the magnetic structure is non-collinear. Recently it has been demonstrate
 d that the Josephson junctions with a composite ferromagnetic interlayer i
 ndeed reveal the triplet long-ranged superconducting current. The triplet 
 superconducting correlations provide the possibility to generate the magne
 tization in the Josephson junction. Such induced magnetization occurs at a
  relatively large distance\, and is sensitive to the superconducting phase
  difference. By tuning the Josephson current\, one may manipulate the long
 -range induced magnetic moment. The induced magnetic moment controlled by 
 the Josephson current may therefore be used in spintronics devices instead
  of the spin-torque effect.\n\nCoupling between the superconducting curren
 t and magnetization opens the very interesting perspectives for emerging s
 uperconducting spintronics.\n\nAcknowledgement: A.B.  Visiting Professorsh
 ip at University of Cambridge is supported by the Leverhulme Trust Award.\
 n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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