Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Magnetic Coupling Phenomena/ Exchange Bias
MA 4.2: Talk
Monday, March 14, 2011, 11:15–11:30, HSZ 403
Domain size engineering in exchange-biased samples — •Niraj Joshi1, Sevil Oezer1, Pablo Stickar2, Sara Romer2, Miguel Marioni2, Tim Ashworth3, and Hans Hug1,2 — 1Department of Physics, University of Basel, CH-4056 Basel, Switzerland — 2EMPA, CH-8600 Dubendorf, Switzerland — 3NanoScan Ltd, CH-8600 Dubendorf, Switzerland
In a magnetic force microscopy experiment the magnetic tip of the MFM maps the magnetic stray field emanating from the surface (or interface) of a sample [1]. Hence, the stray field must contain sufficient information on the magnetization structure to make imaging and quantification possible [2, 3, 4]. Magnetization structures that are divergence free, homogeneously magnetized or have a large spatial wavelength however generate no stray field at all or only near the domain walls. This limits the information that can be gained from MFM experiments. In this work we demonstrated, in EB sample with F (CoPt) / AF (CoCrO) interface, how the domain size can be suitable engineered independent of the thickness of the F-film of interest. We also expect that this domain-size engineering concept can be applied for samples with an in-plane magnetic anisotropy that usually show domain sizes beyond 1 μm.
[1] P. J. A. Schendel, J. Appl. Phys., 88 (2000) 435
[2] P. Kappenberger et al., Phys. Rev. Lett., 91 (2003) 267202
[3] I. Schmid et al., Europhys. Lett., 81 (2008) 17001
[4] I. Schmid et al., Phys. Rev. Lett., 105 (2010) 197201