Regensburg 2000 – scientific programme
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AM: Magnetismus
AM 13: Postersitzung: Dünne Schichten (1–22), Magnetowiderstand (23–40), Phasenübergänge (41–55), Mikromagnetismus (56–68), Spektroskopie (69–77), Nanokristalline Materialien (78–82), Anisotropie (83–86), Schmelzen (87–90), Weitere Bereiche (91–100)
AM 13.86: Poster
Tuesday, March 28, 2000, 16:00–20:00, A
The spin-reorientation transition analyzed by vectorial MOKE — •H.F. Ding1, S. Pütter1, H.P. Oepen1,2 und J. Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle/Saale — 2New address: Insititut für Angewandte Physik, Universitt Hamburg, Jungiusstr. 11, 20335 Hamburg
Magnetization curves obtained with the magneto-optical Kerr effect(MOKE) become generally complicated when not only the component of magnetization along the field direction is involved. This happens, in particular, close to a spin-reorientation transition in ultra-thin films which make the MOKE investigation of the reorientation difficult. In literature the mixing of Kerr signals within and close to the spin-reorientation transition is only qualitatively discussed [1]. We present a new method to separate the individual components which contribute to the mixed Kerr signal and demonstrate its feasibility by applying the method to study the spin-reorientation in Co/Au(111) films. Within the spin-reorientation, we find hysteresis loops with non-vanishing remanence in all three components when a field is applied within the film plane. A vertical field, however, drives the same film into a single domain state exhibiting full remanence. The fact that remanence is found in all magnetization components and full remanence in a vertical field rules out that the transition proceeds via a state of canting of magnetization. [1] Z.Q. Qiu, J. Pearson, and S.D. Bader, Phys. Rev. Lett. 70(1993),1006