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A new magneto-optic enhancement effect in macroscopic ferrimagnets

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4 Author(s)
Fumagalli, Paul ; 2. Phys. Inst., Tech. Hochschule Aachen, Germany ; Spaeth, C. ; Rudiger, Ulrich ; Gambino, R.J.

Optical and magneto-optic properties at room temperature of Co1-x(EuS)x evaporated thin films are presented over a wide photon-energy range. Co1-x(EuS)x belongs to a new class of phase-separated magnetic materials, called macroscopic ferrimagnets, in which two magnetic phases couple antiferromagnetically across the phase boundary. Polar Kerr rotations of up to 2° are observed in Co rich samples (x⩽0.3) at photon energies of 4.5 eV. The high Kerr rotation coincides with a distinct decrease in reflectivity suggesting an optical enhancement effect. A model calculation indicates a new type of enhancement based on the relative index of refraction at the phase boundary between the Co matrix and the EuS precipitate particles

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )