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Spin-dependent cooper pair phase and pure spin supercurrents in strongly polarized ferromagnets.

Authors
  • Grein, R
  • Eschrig, M
  • Metalidis, G
  • Schön, Gerd
Type
Published Article
Journal
Physical review letters
Publication Date
Jun 05, 2009
Volume
102
Issue
22
Pages
227005–227005
Identifiers
PMID: 19658894
Source
Medline
License
Unknown

Abstract

We study heterostructures of singlet superconductors and strongly spin-polarized ferromagnets and show that a relative phase arises between the superconducting proximity amplitudes in the two ferromagnetic spin bands. We find a tunable pure spin supercurrent in a spin-polarized ferromagnet contacted with only one superconductor electrode. We show that Josephson junctions are most effective for a spin polarization P approximately 0.3, and that critical currents for positive and negative bias differ for a high transmission Josephson junction, due to a relative phase between single and double pair transmission.

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