Abstract
Magnetic-field-induced changes in infrared transmission in magnetron sputtered Fe∕Co∕Cu∕Co pseudo-spin-valves (PSV’s) were studied for the magetorefractive effect (MRE). These PSV films deposited on Si (0001) were optimized by annealing at various temperatures (between 100 and 400°C). The optimized PSV films possessed abrupt low-field giant magnetoresistance (GMR) response at 15Oe and the switching field of the top hard magnetic layer was found to be sensitive to post treatments such as annealing and chemical exposure. The room temperature MRE spectra of a Fe (5nm)∕Co (5nm)∕Cu (3nm)∕Co (2nm) PSV were measured and the observed MRE was about 1% at 4μm, correlating well with the GMR effect.
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