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Römer, F. M., Hassel, C., Zakeri Lori, K., Tomaz, C., Barsukov, I., Meckenstock, R., Lindner, J., Farle, M.

Fe monolayers on InAs(001): An in situ study of surface, interface and volume magnetic anisotropy
Journal of Magnetism and Magnetic Materials 321, (14),pp 2232-2238 (2009)
The magnetic anisotropy of epitaxial Fe films with thicknesses in the range of 2-142 monolayers (ML) grown on 4x2 reconstructed InAs(001) was investigated by in situ ferromagnetic resonance. The easy magnetization direction was found to be parallel to the [1[1]0]-direction for Fe films below 4 ML, while it rotates by 45° toward the [100]-direction. It is observed that both surface-interface and volume contribution to the perpendicular anisotropy favor an easy axis perpendicular to the film plane. The cubic surface-interface anisotropy is relatively large with easy axes along 〈1[1]0〉-directions in contrast to the volume contribution which favors easy axes along the 〈110〉-directions. The volume contribution is found to be larger than the Fe bulk cubic anisotropy. A thickness independent uniaxial anisotropy has been found in films with a thickness of 2 up to 142 ML.