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APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 26
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Phys. Rev. Lett. 101, 267201 (2008) [4 pages]

Evidence for a Magnetic Proximity Effect up to Room Temperature at Fe/(Ga,Mn)As Interfaces

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F. Maccherozzi1, M. Sperl2, G. Panaccione1, J. Minár3, S. Polesya3, H. Ebert3, U. Wurstbauer2, M. Hochstrasser4, G. Rossi1,5, G. Woltersdorf2, W. Wegscheider2, and C. H. Back2,*
1Laboratorio Nazionale TASC, INFM-CNR, in Area Science Park, S.S. 14, Km 163.5, I-34012, Trieste, Italy
2Institut für Experimentelle Physik, University Regensburg, D-93040 Regensburg, Germany
3Laboratorium für Festkörperphysik, Wolfgang-Pauli-Strasse 16, ETH Hönggerberg, CH-8093 Zürich, Switzerland
4Dipartimento di Fisica, Universita di Modena e Reggio Emilia, Via A. Campi 231/A, I-41100, Modena, Italy
5Department of Chemistry, Ludwig-Maximilians University Munich, Germany

Received 15 January 2008; revised 30 September 2008; published 22 December 2008

See accompanying Physics Viewpoint

We report x-ray magnetic circular dichroism and superconducting quantum interference device magnetometry experiments to study magnetic order and coupling in thin Fe/(Ga,Mn)As(100) films. We observe induced magnetic order in the (Ga,Mn)As layer that extends over more than 2 nm, even at room temperature. We find spectroscopic evidences of a hybridized d configuration of Mn atoms in Fe/(Ga,Mn)As, with negligible Mn diffusion and/or MnFe intermixing. We show by experiment as well as by theory that the magnetic moment of the Mn ions couples antiparallel to the moment of the Fe overlayer.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.267201
DOI:
10.1103/PhysRevLett.101.267201
PACS:
75.50.Pp, 71.20.Nr, 78.70.Dm

*christian.back@physik.uni-regensburg.de

 
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