Determination of the Infrared Complex Magnetoconductivity Tensor in Itinerant Ferromagnets from Faraday and Kerr Measurements

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.75.214416· OSTI ID:931989

Kim, M. H. ^[1]; Acbas, G. ^[1]; Yang, M. H. ^[1]; Ohkubo, I. ^[2]; Christen, Hans M ^[3]; Mandrus, David ^[3]; Scarpulla, M.A. Scarpulla ^[4]; Dubon, O. D. ^[5]; Schlesinger, Z. ^[6]; Khalifah, Peter ^[3]; Cerne, J. ^[1]

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1. University of Buffalo, The State University of New York
2. University of Tokyo, Tokyo, Japan
3. ORNL
4. Lawrence Berkeley National Laboratory (LBNL)
5. University of California, Berkeley
6. University of California, Santa Cruz

We present measurement and analysis techniques that allow the complete complex magnetoconductivity tensor to be determined from mid-infrared (11-1.6 {micro}m; 100-800 meV) measurements of the complex Faraday ({theta}{sub F}) and Kerr ({theta}{sub K}) angles. Since this approach involves measurement of the geometry (orientation axis and ellipticity of the polarization) of transmitted and reflected light, no absolute transmittance or reflectance measurements are required. Thick-film transmission and reflection equations are used to convert the complex {theta}{sub F} and {theta}{sub K} into the complex longitudinal conductivity {sigma}{sub xx} and the complex transverse (Hall) conductivity {sigma}{sub xy}. {theta}{sub F} and {theta}{sub K} are measured in a Ga{sub 1-x}Mn{sub x}As and SrRuO{sub 3} films. The resulting {sigma}{sub xx} is compared to the values obtained from conventional transmittance and reflectance measurements, as well as the results from Kramers-Kronig analysis of reflectance measurements on similar films.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931989
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 75
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FARADAY EFFECT
FERROMAGNETIC MATERIALS
GALLIUM ARSENIDES
HALL EFFECT
KERR EFFECT
MANGANESE ARSENIDES
MEASURING METHODS
RUTHENIUM OXIDES
STRONTIUM OXIDES