Invariance of the magnetization axis under spin reorientation transitions in polycrystalline magnets of Nd2Fe14B Articles uri icon

authors

  • DIEZ JIMENEZ, EFREN
  • PEREZ DIAZ, JOSE LUIS
  • CANEPA, FABIO
  • FERDEGHINI, CARLO

publication date

  • September 2012

start page

  • 1

end page

  • 4

issue

  • 6 (063918)

volume

  • 112

International Standard Serial Number (ISSN)

  • 0021-8979

Electronic International Standard Serial Number (EISSN)

  • 1089-7550

abstract

  • A great number of useful and practical devices benefit from the use of Nd2Fe14B magnets because of their good magnetic properties and relatively low cost. However, Nd2Fe14B presents a spin-reorientation transition (SRT) at cryogenic temperature that constitutes a challenge for engineers aiming to design devices for use in this environment. Although the spin reorientation transition is well-known for single crystals, there are very few papers describing experiments with polycrystalline samples. In this paper we show the effects of the SRT in macroscopic commercial samples, providing useful experimental data for designers. It has been proven that the macroscopic axis of magnetization in polycrystalline magnets of Nd2Fe14B remains invariant under spin reorientation transition whenever it occurs at H = 0 T. However, the transverse magnetic susceptibility slightly increases after the spin reorientation transition. This makes Nd2Fe14B suitable for cryogenic applications in which permanent magnets with defined axis of magnetization are required.

keywords

  • boron alloys; iron alloys; magnetic susceptibility; neodymium alloys spin dynamics