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DPG

Berlin 2005 – scientific programme

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.55: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Bi-domain state in the exchange bias system FeF2/FM with FM=Fe, Co or Ni — •Oleg Petracic1,2, Igor V. Roshchin1, Zhi-Pan Li1, Rafael Morales1, Xavier Batlle1, and Ivan K. Schuller11Physics Department, University of California, San Diego, La Jolla, California 92093, USA — 2Angewandte Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany

Independently exchange biased subsystems can coexist in FeF2/FM bilayers (FM=Fe, Co or Ni) after various field-cooling protocols. This is evidenced from double hysteresis loops found in magnetization and spatially resolved magneto-optic Kerr-data. Surprisingly the double loops are not only found after zero-field cooling, but also using intermediate cooling fields. In both cases the ferromagnet does not experience an average bias from the antiferromagnet but rather two independent subsystems (’bi-domain’ state). This idea is confirmed by micromagnetic simulations including the effect of the antiferromagnet. We also present experiments, where thermally activated motion of these antiferromagnetic ’domain’ boundaries can be achieved.

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