Magneto-Optical Spectroscopy of Heusler Alloys: Bulk Samples, Thin Films and Microwires

A. Novikov; E.A. Gan'shina; A. Granovsky; A. Zhukov; V. Chernenko

doi:10.4028/www.scientific.net/SSP.190.335

Paper Titles

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HomeSolid State PhenomenaSolid State Phenomena Vol. 190Magneto-Optical Spectroscopy of Heusler Alloys:...

Magneto-Optical Spectroscopy of Heusler Alloys: Bulk Samples, Thin Films and Microwires

Abstract:

We report magneto-optical spectra of the Heusler bulk alloys Ni-Mn-In, thin films Ni-Mn-Ga, microwires Ni-Mn-In and Ni-Mn-Ga in martensitic and austenitic states. Transversal Kerr effect (TKE) was studied at an angle of light incidence of 68° with respect to the sample plane, in the energy range 0.5 eV < E < 4.0 eV, at 50 350 K temperatures, and in magnetic fields up to 3.5 kOe. The TKE spectra profile does not change too much at martensitic transformation in Ni₂MnGa thin films, only magnitudes of characteristic maxima decrease. The magneto-optical response of Ni₂MnGa microwires is very similar to that for Ni₂MnGa thin films. For most of studied bulk samples, the TKE signal is very weak (about 10^-5), about two orders of magnitude smaller than for thin films, and in many cases could not be detected at all. It indicates the strong dependence of the magneto-optical response of Heusler alloys on the quality of optically or electrochemically polished surfaces and their microstructure.

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Periodical:

Solid State Phenomena (Volume 190)

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335-338

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.190.335

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Online since:

June 2012

Authors:

A. Novikov, E.A. Gan'shina, A. Granovsky, A. Zhukov, V. Chernenko

Keywords:

Heusler Alloy, Magnetooptics, Microwires, Thin Film

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