Isotropic Nd-Fe-B thick-film magnets for micro-rotors prepared by PLD method

Masaki Nakano, Masaru Itakura, Takeshi Yanai, Fumitoshi Yamashita, Hirotoshi Fukunaga

Research output: Contribution to journalArticle


The flexibility of magnetization of isotropic thick-film magnets enabled us to enhance the torque of a millimeter-size motor comprising a multipolar magnetized rotor compared to the torque of a miniaturized motor using an anisotropic Nd-Fe-B sintered magnet. In order to upgrade the torque of the small motor further, an increase in the remanence value of the isotropic films is indispensable. In this study, therefore, we prepared nano-composite Nd-Fe-B thick films by a high-speed PLD (pulsed laser deposition) method with a deposition rate of approximately 40 μm/h. Resultantly, the use of additive (Zr or Nb) was effective to enhance the coercivity value of Nd-Fe-B thick-film magnets with Nd-poor composition, however it was difficult to increase the remanence values. In order to apply the thick films to a micro-rotor, investigation on several experiments related to mechanical property was also carried out.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number3
Publication statusPublished - May 1 2014


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

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