Density of states spectra in ferromagnet/superconductor/ferromagnet heterostructures

Hao Meng; Lin Wen; Guo-Qiao Zha; Shi-Ping Zhou

doi:10.1103/PhysRevB.83.214506

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Density of states spectra in ferromagnet/superconductor/ferromagnet heterostructures

Hao Meng, Lin Wen, Guo-Qiao Zha, Shi-Ping Zhou

DOI 10.1103/PhysRevB.83.214506 · Physical Review B

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Abstract

We investigate density of states (DOS) spectra of a ferromagnet/superconductor/ferromagnet structure by including the interface spin-flip scattering potential into the existing mean-field Hamiltonian. We show that the spin-flip scattering can lead to electron spin mixing in the vicinity of an FS interface, enabling s-wave singlet and odd-frequency triplet pairs conversion and the existence of Andreev bound states with subgap energy (±ɛb) via the intra- and interband Andreev reflections. This adds spin-resolved subgap peaks to the DOS spectrum. The relevant elastic co-tunneling at ±ɛb enhances the local conductance, while its competition with the crossed Andreev reflection will lead to a sign change in the nonlocal differential conductance with the bias energy.