Magnetic moment distribution in non-stoichiometric Ni-Mn-Ga ferromagnetic shape memory alloys (Articolo in rivista)

Type
Label
  • Magnetic moment distribution in non-stoichiometric Ni-Mn-Ga ferromagnetic shape memory alloys (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/325/1/012016 (literal)
Alternative label
  • Lazpita, P.; Barandiaran, J. M.; Feuchtwanger, J.; Gutierrez, J.; Rodriguez, I.; Chernenko, V. A.; Stunault, A.; Mondelli, C. (2011)
    Magnetic moment distribution in non-stoichiometric Ni-Mn-Ga ferromagnetic shape memory alloys
    in Journal of physics. Conference series (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lazpita, P.; Barandiaran, J. M.; Feuchtwanger, J.; Gutierrez, J.; Rodriguez, I.; Chernenko, V. A.; Stunault, A.; Mondelli, C. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 325 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Basque Country, Institut Laue Langevin, CNR-IOM-OGG (literal)
Titolo
  • Magnetic moment distribution in non-stoichiometric Ni-Mn-Ga ferromagnetic shape memory alloys (literal)
Abstract
  • In this work we present a model for the net magnetic moment per formula unit measured in Ni-Mn-Ga Ferromagnetic Shape Memory Alloys, analyzing the different types of magnetic interactions appearing in such compounds. We have studied four compositions ranging from a 44% to a 52% Ni content. We found that excess Mn atoms occupy empty positions at Ni and Ga sites. We consider that the Mn atoms at Ni sites (Mn/Ni) can determine that Mn/Ga atoms couple either ferromagnetic (FM) or antiferromagnetically (AF) to Mn/Mn atoms. If Mn/Ga are nearest neighbors to properly-sited Mn/Mn atoms they present AF coupling. However, when Mn/Ni atoms are at closer distances than Mn/Ga ones, so that they become nearest neighbors to Mn/Mn, the AF coupling between Mn/Ni and Mn/Mn atoms is stronger and overcomes that between Mn/Ga and Mn/Mn ones. Therefore Mn/Ga and Mn/Mn will couple ferromagnetically. Polarized neutron diffraction experiments will help to elucidate the validity of our model. (literal)
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