Optical coatings for improved contrast in longitudinal magneto-optic Kerr effect measurements
Journal of Applied Physics, ISSN: 0021-8979, Vol: 100, Issue: 9
2006
- 36Citations
- 22Captures
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Article Description
We have studied the increases in the longitudinal magneto-optic Kerr effect signal contrast that can be achieved by the application of optical overlayers on magnetic films. For simple coatings, a factor of ∼3 improvement in signal contrast is possible. Matching the optical impedance of the magnetic material improves the raw Kerr signal and also reduces the sample reflectivity, yielding a large Kerr angle. The contrast can be optimized by increasing the rotated Kerr reflectivity component while maintaining enough of the base reflectivity Fresnel component to produce a strong signal. Calculations and experimental results are presented for single layer Zr O2 dielectric coatings on Ni along with calculations for a three-layer Au-Zr O2 -Ni structure. Incidence angle effects are also presented. © 2006 American Institute of Physics.
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