Size-dependent effects in exchange-biased planar Hall effect sensor crosses

Marco Donolato, Bjarke Thomas Dalslet, Christian Danvad Damsgaard, K. Gunnarsson, Claus Schelde Jacobsen, P. Svedlindh, Mikkel Fougt Hansen

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Abstract

Exchange-biased planar Hall effect magnetic field sensor crosses with arm width w have been studied as function of w. For large values of w, the magnetic behavior is hysteresis-free and follows the single domain Stoner-Wohlfarth model. When w is decreased, hysteresis is observed in the sensor response. For intermediate values of w, the magnetization reversal takes place in two steps, and for small values of w, the magnetization reversal takes place in a single step. Based on electrical measurements, magnetic force microscopy, and micromagnetic simulations, the observations are explained by an increasing magnetic shape anisotropy of the arms of the cross. We propose a simple analytical model that captures the essential physics of the observations and parameterizes the effects of the cross-shape on the central part of the cross. (C) 2011 American Institute of Physics. [doi:10.1063/1.3561364]
Original languageEnglish
Article number064511
JournalJournal of Applied Physics
Volume109
Issue number6
ISSN0021-8979
DOIs
Publication statusPublished - 2011

Cite this

Donolato, M., Dalslet, B. T., Damsgaard, C. D., Gunnarsson, K., Jacobsen, C. S., Svedlindh, P., & Hansen, M. F. (2011). Size-dependent effects in exchange-biased planar Hall effect sensor crosses. Journal of Applied Physics, 109(6), [064511]. https://doi.org/10.1063/1.3561364