Maximum Energy Product Of Isotropic Nd-Fe-B-based Nanocomposite Magnets

Kuma, J.; Kitajima, N.; Kanai, Yasushi; Fukunaga, H.

doi:10.1109/intmag.1998.737273

Cited by 1 publication

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“…Examination of the crystal grains of this sample showed that the grain diameter was distributed in a wide range of 10 nm to 200 nm, with the average being 70 nm. This is obviously large compared to the optimal grain size of 10 mm to 20 mm for isotropic α − Fe∕Nd − Fe − B nanocomposite magnets as estimated by a computer analysis by Fukunaga and colleagues [16]. In addition, from the results of STEM-HAADF images ( Fig.…”

Section: Composition Dependence Of Magneticmentioning

confidence: 85%

Isotropic Nd‐Fe‐B Thick‐Film Magnets for Micro‐Rotors Prepared by PLD Method

Nakano

Itakura

Yanai

et al. 2014

Electrical Engineering Japan

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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.

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Section: Composition Dependence Of Magneticmentioning

confidence: 85%