Theory of Proximity Effect in Ferromagnet/Superconductor Heterostructures in the Presence of Spin Dependent Interfacial Phase Shift

• Daisuke Yoshizaki

• Alexander A. Golubov

• Yukio Tanaka

• Yasuhiro Asano

抄録

We study the proximity effect and charge transport in ferromagnet (F)/superconductor (S) and S/F/I/F/S junctions (where I is insulator) by taking into account simultaneously exchange field in F and spin-dependent interfacial phase shifts (SDIPS) at the F/S interface. We solve the Usadel equations using extended Kupriyanov–Lukichev boundary conditions which include SDIPS, where spin-independent part of tunneling conductance G T and spin-dependent one G φ coexist. The resulting local density of states (LDOS) in a ferromagnet depends both on the exchange energy E ex and G φ / G T . We show that the magnitude of zero-temperature gap and the height of zero-energy LDOS have a non-monotonic dependence on G φ / G T . We also calculate Josephson current in S/F/I/F/S junctions and show that crossover from 0-state to π.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 51 (1R), 010108-, 2011-12-12

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360284921833361792
• NII論文ID: 210000071597
• DOI: 10.1143/jjap.51.010108
• ISSN: 13474065
• ISSN: 00214922
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.51.010108
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.51.010108/pdf
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