Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Magnetic Thin Films II
MA 21.15: Vortrag
Mittwoch, 27. Februar 2008, 17:45–18:00, H 1012
Direct observation of field and temperature induced domain replication in dipolar coupled perpendicular anisotropy films — Thomas Hauet1, •Christian M Günther2, Bastian Pfau2, Stefan Eisebitt2, Peter Fischer3, Ramon L Rick4,5, Jan-Ullrich Thiele1, Bruce Terris1, and Olav Hellwig1 — 1Hitachi GST, San Jose, CA 95135, USA — 2BESSY, 12489 Berlin, Germany — 3CXRO, LBNL, Berkeley CA 94720, USA — 4Applied Physics, Stanford University, Stanford CA 94305-4090, USA — 5SSRL, SLAC, Menlo Park CA 94295, USA
Studies on the dipolar interactions in magnetic multilayers with perpendicular anisotropy have recently attracted increasing attention in order to improve the reliability of magneto-electronic devices [1] and for applications in multilevel magnetic recording [2]. Particularly, replication of non-uniform magnetic configurations such as domains or bit-patterns in hard/soft bilayers induced by stray fields has been investigated. Combining magnetometry and dichroism in soft X-ray microscopy [3] and holography [4], we directly reveal dipolar interactions in a hard/soft [Co/Pd]_n/Pd/[CoNi/Pd]_m bilayer system. With sub 100 nm resolution, we image domain replication from the hard to the soft magnetic layer. In addition, by tuning the Curie temperature Tc in the CoNi/Pd multilayers, we demonstrate thermally activated domain replication at room temperature in remanence. [1] B. Rodmacq, et al., Phys. Rev. B 73, 92405 (2006). [2] T. Ohta, et al., J. Magn. Magn. Mater. 242, 108 (2002). [3] D.-H. Kim, et al., J. Appl. Phys. 99, 08H303 (2006). [4] S. Eisebitt et al., Nature, 432, 885 (2004).