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Phys. Rev. B 49, 12797–12800 (1994)

[Issue 18 – 1 May 1994 ]

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Topological antiferromagnetism at Cr surfaces and interfaces

A. Vega and L. C. Balbas

Departamento de Fisica Teorica, Universidad de Valladolid, Valladolid, Spain

A. Chouairi

Laboratoire de Physique du Solide, Université de Nancy I, Boîte Postale 239, 54506 Vandoeuvre-les-Nancy, France

C. Demangeat and H. Dreyssé

Institut de Physique et Chimie des Matériaux de Strasbourg, Université Louis Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg, France

The Hubbard tight-binding Hamiltonian is used to derive the local magnetic moments of vicinal Cr surfaces and interfaces. For Cr vicinal surfaces, the magnetic arrangement is a double-cell configuration which consists of monoatomic steps antiferromagnetically coupled to nearest-neighbor monoatomic steps. These results allow us to explain the apparently contradictory observations obtained by spin-resolved and angle-and-energy-resolved photoemission. For the Fe monolayer on vicinal Cr surfaces, a magnetic configuration with a periodicity of two steps is also obtained. As a consequence, the sign of the magnetization at the Fe overlayer oscillates from step to step. This result is in agreement with recent experiments using scanning-electron-microscopy with polarization analysis and magneto-optic Kerr effect.

©1994 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v49/p12797
DOI: 10.1103/PhysRevB.49.12797
PACS: 75.30.Pd, 73.20.-r

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