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

Magneto-optical properties of single crystal of Ni{sub 50.1}Mn{sub 28.4}Ga{sub 21.5} 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.
Authors:
; ; ;  [1] ;  [2] ; ; ;  [3]
  1. Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague (Czech Republic)
  2. Aalto University School of Engineering, PL14200, FIN-00076 Aalto (Finland)
  3. Institute of Physics, ASCR, Na Slovance 2, 182 21 Prague (Czech Republic)
Publication Date:
OSTI Identifier:
22273957
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; APPROXIMATIONS; AUSTENITE; CURIE POINT; ELLIPSOMETRY; GALLIUM; INTERMETALLIC COMPOUNDS; KERR EFFECT; MANGANESE; MARTENSITE; MONOCRYSTALS; NICKEL; OPTICAL PROPERTIES; PHASE TRANSFORMATIONS; PHOTONS; ROTATION; SHAPE MEMORY EFFECT; TEMPERATURE RANGE 0273-0400 K