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Journal of Applied Physics / Volume 93 / Issue 10 / Magnetic Tunnel Junctions: Materials and Applications

J. Appl. Phys. 93, 8382 (2003); http://dx.doi.org/10.1063/1.1555975 (3 pages)

Chopping techniques for low-frequency nanotesla spin-dependent tunneling field sensors

A. Jander, C. A. Nordman, A. V. Pohm, and J. M. Anderson

NVE Corporation, Eden Prairie, Minnesota 55438

Three chopping techniques to address 1/f noise in spin-dependent tunneling magnetoresistive sensors are investigated. These include modulation of the sensitivity using orthogonal fields, modulation, and second-harmonic generation using the nonlinear response of the magnetoresistive element and modulation of the flux concentrator permeability. Of these, only the second technique resulted in a slight reduction in low-frequency noise. In order to achieve significant noise reduction by chopping, domain noise will have to be reduced. © 2003 American Institute of Physics.

© 2003 American Institute of Physics

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KEYWORDS and PACS

Keywords

tunnelling magnetoresistance, magnetic sensors, 1/f noise, harmonic generation, magnetic permeability, magnetic noise, magnetic domains

PACS

  • 85.75.Ss

    Magnetic field sensors using spin polarized transport

  • 07.07.Df

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

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1555975

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Ingvarsson, G. Xiao, R. A. Wanner, P. Trouilloud, Y. Lu, W. J. Gallagher, A. Marley, K. P. Roche, and S. S. P. Parkin, J. Appl. Phys. 85, 5270 (1999)JAPIAU000085000008005270000001.

    S. Ingvarsson, G. Xiao, S. S. P. Parkin, W. J. Gallagher, G. Grinstein, and R. H. Koch, Phys. Rev. Lett. 85, 3289 (2000).

    E. R. Nowak, R. D. Merithew, M. B. Weissman, I. Bloom, and S. S. P. Parkin, J. Appl. Phys. 84, 6195 (1998)JAPIAU000084000011006195000001.


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