Two-Dimensional Imaging of Giant Magnetoresistance with Improved Sensitivity

Author

Armstrong, R. ; Stirk, S.M. ; Mennicke, R.T. ; Matthew, J.A.D. ; Stanton, T. ; Lee, A.F. ; Thompson, S.M.

Author_Institution

Dept. of Phys., Univ. of York, York

Volume

44

Issue

11

fYear

2008

Firstpage

2632

Lastpage

2635

Abstract

Two-dimensional images of giant magnetoresistance (GMR) using an infrared (IR) camera in the 8-12 mum wavelength regime are presented. Remote imaging of GMR involves the use of an IR camera to remotely sense changes in the emissivity of a thin film when a magnetic field is applied through a change in effective temperature, which is shown to be approximately linearly related to the GMR. Operating in the longer wavelength regime offers advantages in the theoretical connection between emissivity and GMR and also in the matching of the peak wavelength of the radiated flux with sample temperature. The GMR images obtained at 8-12 mum demonstrate an improvement in the correlation between GMR and emissivity change over previous work performed at 3-5 mum.

Keywords

giant magnetoresistance; infrared imaging; magnetic fields; 2D imaging; giant magnetoresistance; improved sensitivity; infrared camera; magnetic field; remote imaging; thin film emissivity; wavelength 8 mum to 12 mum; Emissivity; giant magnetoresistance (GMR);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2008.2002599

Filename

4717654