Eur. Phys. J. Appl. Phys.
Volume 30, Number 2, May 2005
|Page(s)||113 - 116|
|Section||Magnetism, Superconductivity and Related Devices|
|Published online||04 March 2005|
Flux-gate like 2D magnetometer based on a single magnetic tunnel junction
LPM, UMR CNRS 7556, BP 239,
54506 Vandœuvre-lès-Nancy Cedex, France
2 LEPSI, 23 rue du Loess, BP 20, 67037 Strasbourg Cedex 2, France
3 LPMIA, UMR CNRS 7040, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
Corresponding author: firstname.lastname@example.org
Revised: 13 September 2004
Accepted: 26 October 2004
Published online: 4 March 2005
The pick-up coil of a conventional flux-gate sensor has been replaced by a magnetic tunnel junction.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 with an optimized magnetoresistive response.
PACS: 85.75.Ss – Magnetic field sensors using spin polarized transport
© EDP Sciences, 2005
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