Comparison of the magnetorefractive effect in transmission and reflection for giant magnetoresistive Co-Ag thin films

Author

Bozec, D. ; Canet, Fanny ; Kravets, V.G. ; Thompson, S.M. ; Matthew, J.A.D.

Author_Institution

Dept. of Phys., York Univ., UK

fYear

2002

Abstract

Summary form only given. The magnetorefractive effect (MRE) measures a change of the dielectric function in the infrared region due to the change in conductivity when a magnetic field is applied to a giant magnetoresistive material. An experimental and theoretical study of the MRE has been performed in reflection and transmission for Co/sub x/Ag/sub 1-x/ granular films on Si[111] substrates. The maximum GMR of 7% was obtained for composition x=0.25. Fourier transform infrared spectroscopy was used to measure the change of reflection and transmission for s- and p-polarisation over a wavelength range from 2 to 25 /spl mu/m in an applied magnetic field up to 15 kOe. Spin dependence was introduced by calculating the optical conductivity using the Zhang and Levy model for GMR in granular materials.

Keywords

Fourier transform spectra; cobalt alloys; dielectric function; discontinuous metallic thin films; giant magnetoresistance; infrared spectra; magneto-optical effects; optical conductivity; silver alloys; 2 to 25 micron; Co/sub x/Ag/sub 1-x/; FTIR reflection; FTIR transmission; Fourier transform infrared spectra; GMR; Si; Si[111] substrate; Zhang and Levy model; dielectric function; giant magnetoresistive material; granular films; magnetorefractive effect; optical conductivity; Conducting materials; Conductivity measurement; Dielectric measurements; Dielectric thin films; Giant magnetoresistance; Magnetic field measurement; Magnetic materials; Optical films; Optical reflection; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2002. INTERMAG Europe 2002. Digest of Technical Papers. 2002 IEEE International

Conference_Location

Amsterdam, The Netherlands

Print_ISBN

0-7803-7365-0

Type

conf

DOI

10.1109/INTMAG.2002.1001243

Filename

1001243