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Flux-gate like 2D magnetometer based on a single magnetic tunnel junction

Published online by Cambridge University Press:  04 March 2005

G. Malinowski ,
M. Hehn ,
J.-B. Kammerer ,
M. Sajieddine ,
E. Jouguelet ,
L. Hébrard ,
P. Alnot ,
F. Braun  and
A. Schuhl
G. Malinowski
Affiliation:
LPM, UMR CNRS 7556, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
M. Hehn*
Affiliation:
LPM, UMR CNRS 7556, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
J.-B. Kammerer
Affiliation:
LEPSI, 23 rue du Loess, BP 20, 67037 Strasbourg Cedex 2, France
M. Sajieddine
Affiliation:
LPM, UMR CNRS 7556, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
E. Jouguelet
Affiliation:
LPM, UMR CNRS 7556, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
L. Hébrard
Affiliation:
LEPSI, 23 rue du Loess, BP 20, 67037 Strasbourg Cedex 2, France
P. Alnot
Affiliation:
LPMIA, UMR CNRS 7040, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
F. Braun
Affiliation:
LEPSI, 23 rue du Loess, BP 20, 67037 Strasbourg Cedex 2, France
A. Schuhl
Affiliation:
LPM, UMR CNRS 7556, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
*
hehn@lpm.u-nancy.fr
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Abstract

The pick-up coil of a conventional flux-gate sensor has been replaced by a magnetic tunnel junction. With this respect, the magnetic properties of tunnel junctions have been optimized to be relevant to flux-gate operation i.e. low-coercitive field and reproducibility of the dynamic switchings. Furthermore, the use of an alternative two-dimensional magnetic driving field extends the use of the flux-gate like sensor to make a 2D magnetometer with a single magnetic tunnel junction without any cross sensitivity. A first demonstration is given with sensitivity above 500 V/T and a noise level evaluated to 2 $\rm \mu T/ \sqrt{Hz}$ with an optimized magnetoresistive response.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 30 , Issue 2 , May 2005 , pp. 113 - 116
Copyright
© EDP Sciences, 2005

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