We report on exchange-induced spin polarization in the magnetic semiconductor EuS at room temperature studied by x-ray magnetic-circular-dichroism measurements. This turns EuS into a promising material for spin-injection applications. The system investigated is a Co∕EuS multilayer grown on top of a Co∕Pt multilayer on a Si(111) substrate. The EuS moments are aligned antiparallel to the Co moments in a narrow region at the Co∕EuS interface. We attribute this exchange-induced alignment to a magnetic proximity effect which is closely related to the magnetic exciton originally proposed by Kasuya [IBM J. Res. Dev.14, 214 (1970)] to explain ferromagnetism in EuS.
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Müller et al. (2006) studied this question.
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