Spin-Dependent Cooper Pair Phase and Pure Spin Supercurrents in Strongly Polarized Ferromagnets

R. Grein; M. Eschrig; G. Metalidis; Gerd Schön

doi:10.1103/PhysRevLett.102.227005

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Spin-Dependent Cooper Pair Phase and Pure Spin Supercurrents in Strongly Polarized Ferromagnets

R. Grein, M. Eschrig, G. Metalidis, Gerd Schön

DOI 10.1103/PhysRevLett.102.227005 · Physical Review Letters

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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∼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.