Phys. Rev. Lett. 102, 227005 (2009) [4 pages]Spin-Dependent Cooper Pair Phase and Pure Spin Supercurrents in Strongly Polarized FerromagnetsReceived 20 March 2009; published 4 June 2009 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∼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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.227005
DOI:
10.1103/PhysRevLett.102.227005
PACS:
74.50.+r, 72.25.Mk, 74.78.Fk, 85.25.Cp
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