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. (c) 2008 Elsevier B. V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 354-360 |
| Number of pages | 7 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 321 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Mar 2009 |
Keywords
- Emissivity
- Infrared
- Giant magnetoresistance
- Remote sensing
- Magnetorefractive effect
- CO/CU MULTILAYERS