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Mesures de basse température des matériaux magnétiques durs.

Low temperature measurements of the hard magnetic materials.

Numéro : pap. 24

Auteurs : GRIGORAS M., URSE M., CHIRIAC H., et al.

Résumé

Hard magnetic materials can be used at low temperatures down to the spin reorientation temperature, Tsr, (eg. around 135 K for Nd-Fe-B). In order to extend the lower limit of usage it is desired to decrease the value of Tsr. This paper reports the influence of different additions and substitutions (Mo, Mo-Cu, Ce) on the hard magnetic properties and Tsr of Nd-Fe-B based films prepared by vacuum deposition. The influence of embedding mode (by alloying or stratification) of additions (i.e. MoCu) in the Nd-Fe-B thin film volume on hard magnetic properties Tsr was also studied. The Nd-Fe-B films with MoCu additions, embedded by stratification, present an increase of the coercive field up to 23.9 kOe and a decrease of Tsr down to 56 K, while Nd-Fe-B films with Ce substitution present a slight deterioration of the magnetic properties and a decrease of Tsr down to 97 K.

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Détails

  • Titre original : Low temperature measurements of the hard magnetic materials.
  • Identifiant de la fiche : 30018358
  • Langues : Anglais
  • Source : 1st IIR International Conference of Cryogenics and Refrigeration Technology (ICCRT 2016). Proceedings: Bucharest, Romania, June 22-25, 2016.
  • Date d'édition : 22/06/2016
  • DOI : http://dx.doi.org/10.18462/IIR.ICCRT.2016.0024

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