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AM: Magnetismus

AM 11: Postersitzung

AM 11.29: Poster

Dienstag, 24. März 1998, 16:15–20:00, B

Perpendicular Anisotropy in Fe/CeH₂ Multilayers with reduced Pair Number — •M. MÜNZENBERG¹, W. LOHSTROH¹, O. SCHULTE¹, W. FELSCH¹, C. DUFOUR², and P. BAUER² — ¹I. Physikalisches Institut und SFB 345, Universität Göttingen — ²Laboratoire du Physique de Solide, Université de Nancy I, France

The magnetism of UHV-sputtered (111)-textured Fe films, separated by CeH₂, has been studied with the magneto-optic Kerr effect in the longitudinal configuration. VSM-studies, susceptibility measurements and Mössbauer spectroscopy on samples with ∼30 couples have shown a thermally driven reorientation of the magnetisation from perpendicular to in plane [1]. MOKE experiments reveal that the reorientation temperature T_R decreases with the number of bilayers. This can be ascribed to a reduced magnetostatic contribution to the anisotropy energy. At the reorientation transition, multiple peaks in the differentiated Kerr-signal occur. In a first interpretation these peaks could be identified with a different magnetic anisotropy energy of the outer and inner Fe-layers. In addition Mössbauer spectroscopy on samples with a reduced pair number shows that the mangetisation direction below T_R is not perfectly out-of-plane. At the reorientation transition it turns gradually in correspondence with the MOKE-measurements.

[1] O. Schulte, F. Klose, and W. Felsch, Phys. Rev. B 52, 6480 (1995)