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MA: Fachverband Magnetismus

MA 43: Micro- and Nanostructured Magnetic Materials IV

MA 43.2: Talk

Wednesday, March 16, 2011, 17:15–17:30, HSZ 103

Domain wall movement assisted transport of superparamagnetic particles on magnetically patterned samples — •Daniel Lengemann, Florian Göllner, Dieter Engel, and Arno Ehresmann — Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

By 10 keV He-ion bombardment IrMn/CoFe exchange biased layers were patterned magnetically into stripes with alternating anisotropy directions. In remanence superparamagnetic particles were deposited onto the Bloch domain walls. The domains of the sample have different magnetization reversal mechanisms in an external magnetic field for each hysteresis loop branch: In the branch towards saturation the reversal is dominated by domain wall movement, in the branch towards remanence domain nucleation and coherent rotation are dominant.

With these mechanisms the particles move due to domain wall movement while no movement is seen for the domain nucleation and rotation. With controlling the x- and the z-direction of the pulsed external field, the direction of the particle movement can be defined.