Abstract
This paper reports on an IR study (5–20 µm) of the dispersion and field dependences of the magnetorefractive effect in granular CoFe-MgF (metal-insulator) systems, which exhibit, in compositions close to the percolation threshold, a tunneling magnetoresistance of 7.5% in a field of 1700 Oe. The change in the reflectivity of p-polarized light under magnetization in the IR spectral region 5–7 µm is of the order of 0.1%, while in the 10-to 12-µm region, this change, reaches record-high values of 1.2–1.5%, which exceed the usual odd and even magnetooptic reflectivities in the IR range by two orders of magnitude. The magnetorefractive effect in magnetic systems with tunneling conduction originates from spin-dependent high-frequency tunneling.
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Translated from Fizika Tverdogo Tela, Vol. 45, No. 5, 2003, pp. 868–870.
Original Russian Text Copyright © 2003 by Granovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\), Gushchin, Bykov, Kozlov, Kobayashi, Ohnuma, Masumoto, Inoue.
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Granovskii, A., Gushchin, V., Bykov, I. et al. Giant magnetorefractive effect in magnetic granular CoFe-MgF alloys. Phys. Solid State 45, 911–913 (2003). https://doi.org/10.1134/1.1575334
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DOI: https://doi.org/10.1134/1.1575334