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Deutsche Physikalische Gessellschaft IOP Institute of Physics

On the resolution limits of tunnel magnetoresistance sensors for particle detection

A Weddemann1, A Auge, C Albon, F Wittbracht and A Hütten

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Elliptical magnetoresistance sensors are analyzed with respect to their capability of high spatial resolution of particle detection. The sensor response with respect to the particle position is investigated by solving the equation of static micromagnetism. We demonstrate how the shape of the sensor can be used to obtain information about the particle position. It is verified that the external fields applied to bring particles into saturation can be utilized to tune the measurement: increasing the external fields will increase the spatial resolution of the sensor but will also reduce the visibility field in which a particle can still be detected.


PACS

85.70.-w Magnetic devices

07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing

07.55.-w Magnetic instruments and components

Subjects

Electronics and devices

Condensed matter: electrical, magnetic and optical

Instrumentation and measurement

Dates

Issue 11 (November 2009)

Received 11 August 2009

Published 13 November 2009



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