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Spin-Resolved Tunneling Studies of the Exchange Field in EuS=Al Bilayers Y. M. Xiong, S. Stadler, and P. W. Adams
 

Summary: Spin-Resolved Tunneling Studies of the Exchange Field in EuS=Al Bilayers
Y. M. Xiong, S. Stadler, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
G. Catelani
Department of Physics, Yale University, New Haven, Connecticut 06520, USA
(Received 25 February 2011; published 14 June 2011)
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 nonlinear 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.
DOI: 10.1103/PhysRevLett.106.247001 PACS numbers: 74.50.+r, 74.45.+c, 75.70.Ak, 85.75.Ąd
Owing to their different symmetries, itinerant ferromag-
netic (FM) order and spin-singlet superconducting (SC)
order are generally mutually exclusive. With rare excep-
tion, nature does not allow ferromagnetic order to coexist
with BCS superconductivity [1]. This immiscibility can,
however, lead to interesting effects in the vicinity of a FM-

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science