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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.5: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Real time observation of magnetic nanobead transportation using domain walls in ferromagnetic nanostripes — •Sascha Glathe, Jörg Beinersdorf, Robert Müller, Sandra Julich, Thomas Henkel, Uwe Hübner, and Roland Mattheis — IPHT Jena e.V., Albert-Einstein-Str. 9, 07745 Jena

It was recently proposed that magnetic nanobeads can be trapped [1] and manipulated [2] by means of domain walls (DW) in magnetic nanostripes for biological applications. The bead is pinned in the vicinity of the DW due to the stray field originating from a transverse DW at the surface. We will show the reliable control of magnetic beads (SiO₂ coated γ−Fe₂O₃ particles) with a diameter of 500-1500 nm by DWs in 200*20 nm² Permalloy (Py) nanostripes. The Py layer was deposited by means of a UHV sputter deposition and patterned using e-Beam lithography and Ar-Ion etching. We used not-gate like structures [3] to allow for DW transportation with a rotating magnetic field, whereby the frequency of the rotating field determines the velocity of the DWs. The nanobead movement was detected by means of a dark field microscope with a 14,7 frames/s camera. We will show that the DW velocity is limited by the drag force of the nanobead in the liquid medium. From frequency dependent measurements we could estimate the drag force in dependence on the bead diameter.

[1] P. Vavassori et al., Appl. Phys. Lett., 93, 203502 (2008)

[2] M. T. Bryan et al., Appl. Phys. Lett., 96, 192503 (2010)

[3] D. A. Allwood et al., Science, 296, 2003 (2002)