Magnetorefractive and magnetic-linear-dichroism effect in exchange-biased spin valves

J. van Driel, F. de Boer, R. Coehoorn

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelpeer review

21 Citaten (Scopus)


We have investigated the magnetorefractive and the magnetic-linear-dichroism effects, which both lead to a frequency-dependent change of the transmission of infrared light, in giant magnetoresistance exchange-biased spin valves. The magnetorefractive effect occurs upon changing the magnetic configuration of the spin valve, whereas the magnetic-linear-dichroism effect occurs when changing the linear polarization direction of the light with respect to the magnetization direction(s) in the spin valve. The systems studied are (Formula presented) with (Formula presented) or NiO. A linear relation between the maximum size of the magnetorefractive effect and the dc magnetoresistance ratio has been found at room temperature. The magnetorefractive effect was analyzed with a simple model containing a frequency-dependent and spin-dependent conductivity that influences the complex refractive index of the spin valve. From the analysis of the measurements, the spin-polarized relaxation times averaged over the layer stack were determined. Extrapolation of the relaxation times to zero Cu thickness yields spin-asymmetry parameters (Formula presented) and (Formula presented) at room temperature for (Formula presented) and NiO-biased spin valves, respectively (Formula presented) and (Formula presented) are the spin-dependent relaxation times). The results indicate that scattering of electrons at the (Formula presented) interface in the spin valves is, at least in part, specular.

Originele taal-2Engels
Pagina's (van-tot)15321-15326
Aantal pagina's6
TijdschriftPhysical Review B - Condensed Matter and Materials Physics
Nummer van het tijdschrift22
StatusGepubliceerd - 1 jan 2000
Extern gepubliceerdJa


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