Spin configuration in a frustrated ferromagnetic/antiferromagnetic thin film system

Details Spin configuration in a frustrated ferromagnetic/antiferromagnetic thin film system Spin configuration in a frustrated ferromagnetic/antiferromagnetic thin film system

2007-06-28

arxiv.org/abs/0706.4172v1

Nanotechnology 18, 235702 (2007)

Physics

Condensed Matter

Materials Science

10 pages, 5 figures

Scientific paper

10.1088/0957-4484/18/23/235702

We have studied the magnetic configuration in ultrathin antiferromagnetic Mn films grown around monoatomic steps on an Fe(001) surface by spin-polarized scanning tunneling microscopy/spectroscopy and ab-initio-parametrized self-consistent real-space tight binding calculations in which the spin quantization axis is independent for each site thus allowing noncollinear magnetism. Mn grown on Fe(001) presents a layered antiferromagnetic structure. In the regions where the Mn films overgrows Fe steps the magnetization of the surface layer is reversed across the steps. Around these defects a frustration of the antiferromagnetic order occurs. Due to the weakened magnetic coupling at the central Mn layers, the amount of frustration is smaller than in Cr and the width of the wall induced by the step does not change with the thickness, at least for coverages up to seven monolayers.

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