Enhancement in magnetic torque of cylindrical micro rotor by usage of directly consolidated α-Fe/Pr2Fe14B-based nanocomposite thick-films

Yamashita, F.; Nishimura, S.; Kobayashi, Osamu; Itoh, Masahiro; Nakano, Masaki; Fukunaga, H.; Ishiyama, K.

doi:10.1063/1.3553934

Cited by 16 publications

(7 citation statements)

References 2 publications

(4 reference statements)

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“…Considering future application of thick‐film magnets to micro‐rotors, the the magnetic properties must be further improved and the mechanical characteristics must be estimated. Thus researchers are considering depositing anisotropic thick‐film magnets on nonmagnetic substrates combined with in‐plane magnetization so as to reduce the influence of the demagnetizing field by using magnetic shape anisotropy . The magnetic film should be several times as thick as the nonmagnetic substrate to generate a stronger magnetic field from the film edges.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Yamashita and colleagues investigated torque enhancement based on high degrees of freedom in the magnetization direction of isotropic magnetic films, and promoted the use of isotropic magnetic films in the rotors of miniature motors . Regarding the improvement of the magnetic properties of isotropic thick‐film magnets fabricated by PLD, especially high remanences of up to 1.0 T combined with thermal stability, one can expect experimental magnets with coercivities above 600 kA/m.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…miniaturized permanent magnet is useful to develop the size reduction of devices in industrial and medical fields [1][2][3]. Although thinned Nd-Fe-B magnets prepared using a sputtering method have been applied to small electronic devices [4][5][6][7][8], we have difficulty obtaining small Nd-Fe-B magnets with the thickness of sub millimeter due to the low deposition rate.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Deposition of Pr–Fe–B Permanent-Magnet Powder Using Pulsed Laser

et al. 2020

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We have already prepared a thin permanent magnet with the thickness of sub millimeter by obtaining magnet powders using a PLD (Pulsed Laser Deposition) method. In the study, the PLD followed by a flash annealing enabled us to deposit isotropic Pr-Fe-B magnet powders with coercivity (H cj ) > 1000 kA/m on a stainless thin shaft applicable to a miniaturized motor. Observation on the surface of Pr-Fe-B magnets and evaluation on mechanical behavior was carried out. Since the surface of a Pr-Fe-B magnet was coated by a Pr oxide through an annealing process, their magnetic properties didn't degrade after one year. We also confirmed that the Pr-Fe-B magnet has possibility to be applied to a micro magnetization process. It was clarified that the powder technology using the PLD is useful to propose a thin magnet applicable to a next generation small motor.

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“…25) The values of remanence and (BH) max of two samples were, however, inferior to those of isotropic RE (Nd or Pr)-Fe-B=α-Fe nanocomposite ribbons. 26,27) In this contribution, we focused on the high magnetic crystalline anisotropy constant of a Pr 2 Fe 14 B phase (K u = 6.8 MJ=m 3 ) 28) as a hard magnetic phase of a multilayered nanocomposite magnet.…”

Section: Introductionmentioning

confidence: 99%

Pr–Fe–B+α-Fe nanocomposite film magnets prepared by pulsed laser deposition method

Yamashita¹,

Nakano²,

Oshima³

et al. 2016

Jpn. J. Appl. Phys.

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An increase in the remanence of an isotropic film magnet is indispensable to improve the properties of miniaturized devices. We, therefore, tried to prepare Pr–Fe–B/α-Fe multilayered nanocomposite thick-film magnets by a pulsed laser deposition (PLD) method. Namely, a rotated target composed of a Pr x Fe14B (x = 2.2 or 2.4) target together with an α-Fe segment was ablated. We also took account of a small spot size of the laser beam in order to suppress the emission of droplets (large particles) from each target. An optimization on the area of the α-Fe segment in each Pr x Fe14B target was carried out, and the remanence of an annealed film reached approximately 1.1 T. Moreover, a transmission electron microscopy (TEM) observation of the above-mentioned sample revealed that the microstructure varied from a multilayered structure (as-deposited) to a dispersed one through the annealing process. Resultantly, the annealed film had a dispersed nanocomposite structure with good exchange coupling.

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Enhancement in magnetic torque of cylindrical micro rotor by usage of directly consolidated α-Fe/Pr2Fe14B-based nanocomposite thick-films

Cited by 16 publications

References 2 publications

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

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

Preparation and Deposition of Pr–Fe–B Permanent-Magnet Powder Using Pulsed Laser

Pr–Fe–B+α-Fe nanocomposite film magnets prepared by pulsed laser deposition method

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