Spin-valve effect in superconductor/ferromagnet/ferromagnet and ferromagnet/superconductor/ferromagnet structures of atomic thickness
Zh. Devizorova, S. Mironov
DOI 10.1103/PhysRevB.95.144514 · Physical Review B
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Abstract
We show that the peculiarities of the electron band structure strongly affect the spin-valve effect in heterostructures consisting of a superconductor (S) and two ferromagnetic layers F1 and F2. For the S/F1/F2 systems the energy shift between the electron bands in the S and F2 layers determines whether the critical temperature Tc of the superconductor increases or decreases as a function of the angle θ between the magnetic moments in the ferromagnets. In the case of the half-metallic F2 layer the type of the spin-valve effect becomes dependent on the position of the only occupied spin band and the minimum of Tc may correspond to the antiparallel, parallel, or noncollinear orientations of magnetic moments. Also, for the first time, we analytically demonstrate the possibility of the triplet spin-valve effect in the F/S/half-metal structures.
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