Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 9: Magnetic Imaging

MA 9.6: Vortrag

Montag, 27. März 2006, 16:15–16:30, HSZ 401

Atomic Spin Structure of Antiferromagnetic Domain Walls — •M. Bode, E. Vedmedenko, K. von Bergmann, A. Kubetzka, P. Ferriani, S. Heinze, and R. Wiesendanger — Institute of Applied Physics and Microstructure Research Center, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

The search for uncompensated magnetic moments on antiferromagnetic surfaces is of great technological importance as they are responsible for the so-called exchange-bias effect which is widely used in state-of-the-art magnetic storage devices. We have studied the atomic spin structure of phase domain walls in the antiferromagnetic Fe monolayer on W(001) by means of spin-polarized scanning tunneling microscopy and Monte-Carlo simulations. The domain wall width amounts to 6-8 atomic rows only. While walls oriented along ⟨ 100⟩ directions are found to be fully compensated, the detailed analysis of ⟨ 110⟩ walls reveals an uncompensated perpendicular magnetic moment. This finding may lead to a detailed understanding of the exchange-bias effect.