Spin-Resolved Tunneling Studies of the Exchange Field in EuS/Al Bilayers
arXiv:1105.3759 · doi:10.1103/PhysRevLett.106.247001
Abstract
We use spin-resolved electron tunneling to study the exchange field in the Al component of EuS/Al bilayers, in both the superconducting and normal-state phases of the Al. Contrary to expectation, we show that the exchange field, Hex, is a non-linear function of applied field, even in applied fields that are well beyond the EuS coercive field. Furthermore the magnitude Hex is unaffected by the superconducting phase. In addition, Hex decreases significantly with increasing temperature in the temperature range of 0.1-1 K. We discuss these results in the context of recent theories of generalized spin-dependent boundary conditions at a superconductor/ferromagnet interface.
4+ pages, 5 figures, to appear in Phys. Rev. Lett
References in corpus (5)
- Spectroscopy and critical temperature of diffusive superconducting/ferromagnetic hybrid structures with spin-active interfaces
- Fermi-liquid effects in the gapless state of marginally thin superconducting films
- Nonequilibrium spin-dependent phenomena in mesoscopic superconductor-normal metal tunnel structures
- Pairing resonance as a normal-state spin probe in ultra-thin Al films
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