期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.247001
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资金
- U.S. DOE [DE-FG02-07ER46420]
- Yale University
- NSF [DMR-0545728]
- U.S. Department of Energy (DOE) [DE-FG02-07ER46420] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [965009] Funding Source: National Science Foundation
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 H-ex is a nonlinear function of applied field, even in applied fields that are well beyond the EuS coercive field. Furthermore, the magnitude H-ex is unaffected by the superconducting phase. In addition, H-ex 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.
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