We perform magnetoresistance (MR) and magneto-optical Kerr effect (MOKE) measurements to experimentally track magnetic domain wall (DW) pinning/depinning process in L-shaped Permalloy nanostructures of different geometries (i.e., square/round corner and absence/presence of circular disks) with widths in the range 75-400 nm. With MR and MOKE measurements being in a good quantitative agreement, we demonstrate that the field interval between pinning and depinning events increases with reduction of the nanowire width. In addition, the DW pinning/depinning behavior is geometry dependent, where round corners break the symmetry in the device orientation with respect to the field. The interpretation of experimental results is supported by micromagnetic simulations

Influence of geometry on domain wall dynamics in Permalloy nanodevices / Corte-Leon, H.; Beguivin, A.; Krzysteczko, P.; Schumacher, H.W.; Manzin, A.; Cowburn, R.P.; Antonov, V.; Kazakova, O.. - In: IEEE TRANSACTIONS ON MAGNETICS. - ISSN 0018-9464. - 51:Issue 1, Article number 7029184(2015). [10.1109/TMAG.2014.2356617]

Influence of geometry on domain wall dynamics in Permalloy nanodevices

MANZIN, ALESSANDRA;
2015

Abstract

We perform magnetoresistance (MR) and magneto-optical Kerr effect (MOKE) measurements to experimentally track magnetic domain wall (DW) pinning/depinning process in L-shaped Permalloy nanostructures of different geometries (i.e., square/round corner and absence/presence of circular disks) with widths in the range 75-400 nm. With MR and MOKE measurements being in a good quantitative agreement, we demonstrate that the field interval between pinning and depinning events increases with reduction of the nanowire width. In addition, the DW pinning/depinning behavior is geometry dependent, where round corners break the symmetry in the device orientation with respect to the field. The interpretation of experimental results is supported by micromagnetic simulations
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/52309
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