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Magnetic Anisotropy in Case-Carburized Surfaces after Hard Turning

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Neslušan M., Blažek D., Hrabovský D., Bukovina M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
188-189
EN
This paper deals with magnetic anisotropy found in hard turned surfaces. The high magnetic anisotropy of the surface after hard turning operations occurs due to severe plastic deformation and high temperature, exceeding the Curie temperature in the cutting zone, followed by rapid cooling. The transformed microstructures of the surface, and stress anisotropy near the surface cause the magnetic anisotropy and magnetic domain reconfiguration. On the contrary, temperatures during grinding usually do not exceed Curie temperature and so the remarkable magnetic anisotropy after grinding operations in not found. The magnetic properties of the studied surfaces are analyzed by Barkhausen noise emission as well as magneto-optical methods. The results of these two techniques are used to study the magnetic anisotropy.
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Ellipsometric Selective Sensitivity to Magnetic Nanostructures

64%
Hamrlová J., Postava K., Životský O., Hrabovský D., Pištora J., Švec P., Janičkovič D., Maziewski A.
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EN
Recently, we have shown that the approach of depth sensitivity of magneto-optic ellipsometry can be generalized to selectivity from different materials in nanostructures. We use the condition number as the figure of merit to quantify the magneto-optic selectivity to two different magnetic contributions in magnetic nanostructure. The method is demonstrated on nanostructures containing magnetically hard Fe particles in surface layer of soft FeNbB amorphous ribbon. We separated both magnetic contributions from measurement of hysteresis loops using magneto-optic Kerr effect in longitudinal configuration. Magneto-optic selectivity is discussed and theoretical model on the basis of effective medium is compared with experimental data of longitudinal magneto-optic Kerr effect depending on angle of incidence.
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