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Phys. Rev. Lett. 69, 1121–1124 (1992)

[Issue 7 – 17 August 1992 ]

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Magnetic ordering of Cr layers on Fe(100)

T. G. Walker, A. W. Pang, and H. Hopster

Department of Physics and Institute for Surface and Interface Science, University of California, Irvine, California 92717

S. F. Alvarado

IBM Research Division, Zürich Research Laboratory, 8803 Rüschlikon, Switzerland

The magnetic ordering at the surface of epitaxial Cr overlayers on Fe(100) is studied by spin-polarized electron-energy-loss spectroscopy. The exchange asymmetry oscillates with the thickness of the Cr overlayer with a period of about two atomic layers, proving directly that the surface Cr layer has a net ferromagnetic moment and that successive layers order antiferromagnetically. The exchange asymmetry is predominantly due to spin-flip scattering. The spin-flip spectrum broadens toward lower energy with increasing thickness, suggesting that Cr may have a surface-enhanced magnetic moment.

©1992 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v69/p1121
DOI: 10.1103/PhysRevLett.69.1121
PACS: 75.70.Ak, 75.30.Pd, 75.50.Rr

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