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Equal-spin Andreev reflection at high-temperature superconductor/half-metal interfaces

The penetration of a superconducting current from a superconductor into a half-metallic ferromagnet is forbidden in the conventional picture of the proximity effect. However, we found resonances in the conductance spectra of superconductor/half-metal heterostructures that suggest the occurrence of unconventional equal-spin Andreev reflection, which allows for the generation and propagation of high-temperature superconducting spin currents into the half-metal. This mechanism may open the door to novel spintronic devices.
C. Visani et al., Nature Physics (2012)