Inverse transition from low temperature paramagetism to high temperature ferromagnetism in Co-doped NiMnGa alloys (Abstract/Poster in convegno)

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Label
  • Inverse transition from low temperature paramagetism to high temperature ferromagnetism in Co-doped NiMnGa alloys (Abstract/Poster in convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Fabbrici S.; Albertini F.; Paoluzi A.; Bolzoni F.; Cabassi R.; Solzi M.; Righi L.; Calestani G.; Soukova M.; Kamarad J.; Arnold Z. (2009)
    Inverse transition from low temperature paramagetism to high temperature ferromagnetism in Co-doped NiMnGa alloys
    in 8th European Symposium on Martensitic Transformations, Praga, Repubblica Ceca
    (literal)
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  • Fabbrici S.; Albertini F.; Paoluzi A.; Bolzoni F.; Cabassi R.; Solzi M.; Righi L.; Calestani G.; Soukova M.; Kamarad J.; Arnold Z. (literal)
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  • In: ESOMAT 2009 - 8th European Symposium on Martensitic Transformations (Praga, Repubblica Ceca, 7-11 settembre 2009). (literal)
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  • NiMnGa alloys display several \"giant\" effects (e.g. magnetocaloric, magnetoelastic, magnetoresistive) due to the interplay between magnetic and structural degrees of freedom. A large magnetization difference, ΔM, between martensitic (MP) and austenitic (AP) phases is of great importance to obtain higher performances due to the improved possibility of driving structural transformations by magnetic fields. A ΔM enhancement was recently achieved by adding Co to Mn-rich NiMnGa alloys [1]. To contribute to the understanding of Co effects we have mapped the behaviour of Co-substituted alloys. Samples of composition Ni50-xCoxMn25+yGa25-y (5x13 and 5y7) were arc melted and characterized by microprobe analysis and, as a function of temperature, by X-ray diffraction and magnetic measurements. Using the dependence of magnetic order and of martensitic transition on Mn and Co content, we have been able to tune the critical temperatures and to obtain the Curie temperature of the MP much lower than the AP and lower than the structural transformation temperatures. For peculiar compositions (e.g x (literal)
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  • CNR-IMEM, Parma, CNISM-Dipartimento di Fisica, Università di Parma, Dipartimento di Chimica dell'Università di Parma, Italy, Dipartimento di Chimica GIAF, Parma, Italy, Institute of Physics, ASCR, Prague, Czech Republic (literal)
Titolo
  • Inverse transition from low temperature paramagetism to high temperature ferromagnetism in Co-doped NiMnGa alloys (literal)
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