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Magnetoanisotropic Andreev Reflection in Ferromagnetic-Superconductor Junctions
BaC6
Marcos Henrique Lima de Medeiros
Tuesday, May 03, 2016
Andreev reflection spectroscopy of ferromagnet-superconductor (FS)
junctions is an important probe of spin polarization. We theoretically
investigate spin-polarized transport in FS junctions in the presence
of Rashba and Dresselhaus interfacial spin-orbit fields and show that
Andreev reflection can be controlled by changing the magnetization
orientation. We predict a giant in- and out-of-plane magnetoanisotropy
of the junction conductance. If the ferromagnet is highly spin
polarized—in the half-metal limit—the magnetoanisotropic Andreev
reflection depends universally on the spin-orbit fields only. Our
results show that Andreev reflection spectroscopy can be used for
sensitive probing of interfacial spin-orbit fields in a FS junction.
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