Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 3: Magnetische Abbildungsverfahren
MA 3.4: Vortrag
Freitag, 4. März 2005, 11:15–11:30, TU H1028
Imaging uncompensated spins in microstructured CoFeB/MnIr — •T. Eimüller1, T. Kato2, T. Mizuno2, C. Quitmann3, T. Ramsvik3, S. Tsunashima2, S. Iwata4, and G. Schütz1 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, D-70569 Stuttgart, Germany — 2Department of Electronics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan — 3Paul-Scherrer-Institute, SLS, CH-5232 Villigen, Switzerland — 4CCRAST Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Exchange bias is assumed to originate in pinned, uncompensated magnetic moments, located at the FM/AFM interface. Recent progress in high resolution magnetic imaging with polarized soft x-rays allows direct observation of uncompensated spins. Using x-ray magnetic circular dichroism (XMCD) as a contrast mechanism in photoemission electron microscopy (PEEM) we studied the element specific domain configuration of a technologically important Co86Fe10B4 / Mn77Ir23 / Ni80Fe20 / Si3N4 exchange bias film [1]. We found that in regions, where the sample was patterned with a 22 keV Ga+ focused ion beam, the magnetization shows less preferred orientation along the exchange bias direction than in unpatterned areas. Furthermore, we imaged uncompensated Mn spins at the CoFeB/MnIr interface and found an antiferromagnetic coupling between the Mn and the Co magnetic moments.
[1] T. Eimüller, T. Kato, T. Mizuno, S. Tsunashima, C. Quitmann, T. Ramsvik, S. Iwata and G. Schütz, Appl. Phys. Lett. 85, 2310 (2004)