Modelling the sensitivity of infrared emissivity of magnetic thin films to giant magnetoresistance |
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Authors: | SM Stirk SM Thompson JAD Matthew |
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Institution: | Department of Physics, University of York, York YO10 5DD, UK |
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Abstract: | The correlation between emissivity and giant magnetoresistance (GMR) in magnetic thin films is investigated at infrared (IR) wavelengths using a thin-film model of emissivity. The sensitivity of emissivity to GMR is shown to depend upon film thickness, and agrees excellently with bulk-material results for films thicker than the material skin depth. However, for films thinner than the skin depth the sensitivity to GMR is shown to weaken. In addition, at mid-to-far IR wavelengths the spectral dependence of the correlation is investigated using a modified Drude-type expression for the refractive index combined with the thin-film model. This is applied to a multilayered GMR material, and the sensitivity of emissivity to GMR is shown to have a similar spectral dependence to that of the magnetorefractive effect. An analytical interpretation in terms of skin depth is also developed at long wavelengths, and shown to agree excellently with thin-film simulations. |
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Keywords: | 07 07 Df 42 79 Pw 73 50 Jt 73 61 At 75 47 De 75 47 Np 75 70 Cn 78 20 Ci 78 20 Ls 78 66 Bz 78 67 Pt 81 70 Fy 85 60 G |
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