Magneto-optical spectroscopy of ferromagnetic shape-memory Ni-Mn-Ga alloy

Magneto-optical properties of single crystal of Ni50.1Mn28.4Ga21.5 magnetic shape memory alloy in martensite and austenite phase were systematically studied. Crystal orientation was approximately along {100} planes of parent cubic austenite. At room temperature, the sample was in modulated 10M marte...

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Bibliographic Details
Published in:Journal of applied physics 2014-05, Vol.115 (17)
Main Authors: Veis, M., Beran, L., Zahradnik, M., Antos, R., Straka, L., Kopecek, J., Fekete, L., Heczko, O.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
APPROXIMATIONS
AUSTENITE
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Crystal structure
CURIE POINT
Curie temperature
Dependence
ELLIPSOMETRY
Ferromagnetism
GALLIUM
INTERMETALLIC COMPOUNDS
KERR EFFECT
Kerr magnetooptical effect
Magnetic properties
MANGANESE
MARTENSITE
Martensitic transformations
MONOCRYSTALS
NICKEL
Nickel base alloys
Optical memory (data storage)
OPTICAL PROPERTIES
PHASE TRANSFORMATIONS
Phase transitions
PHOTONS
ROTATION
Shape memory alloys
SHAPE MEMORY EFFECT
Single crystals
Spectrum analysis
Temperature
TEMPERATURE RANGE 0273-0400 K
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Summary:Magneto-optical properties of single crystal of Ni50.1Mn28.4Ga21.5 magnetic shape memory alloy in martensite and austenite phase were systematically studied. Crystal orientation was approximately along {100} planes of parent cubic austenite. At room temperature, the sample was in modulated 10M martensite phase and transformed to cubic austenite at 323 K. Spectral dependence of polar magneto-optical Kerr effect was obtained by generalized magneto-optical ellipsometry with rotating analyzer in the photon energy range from 1.2 to 4 eV, and from room temperature to temperature above the Curie point. The Kerr rotation spectra exhibit prominent features typical for complexes containing Mn atoms. Significant spectral changes during transformation to austenite can be explained by different optical properties caused by changes in density of states near the Fermi energy.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4867754