Investigation on Magnetic Torque of Multi-Polarly Micro Rotor Using Shape-Magnetic-Anisotropy

Yamashita, F.; Nishimura, S.; Menjo, N; Kobayashi, Osamu; Nakano, Masaki; Fukunaga, H.; Ishiyama, K.

doi:10.1109/tmag.2010.2041051

Cited by 12 publications

(8 citation statements)

References 3 publications

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“…[1][2][3][4] In addition to the magnetic properties of a film magnet; its deposition rate and the simplicity with which it can be incorporated in a machine are important factors in determining its usefulness. From the perspective of this latter factor, 5 we have studied rapid fabrication of isotropic Nd-Fe-B thick-film magnets by pulsed laser deposition (PLD). We fabricated a film by PLD with a high deposition rate of 9 lm/(hÁW); this film had a coercivity of about 1000 kA/m, a remanence of about 0.6 T, and a (BH) max value of 60 kJ/m 3 (Ref.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser beam parameters on magnetic properties of Nd–Fe–B thick-film magnets fabricated by pulsed laser deposition

Fukunaga

Kamikawatoko

Nakano

et al. 2011

Journal of Applied Physics

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The effects of varying the laser power and the spot diameter of a laser beam on the magnetic properties, morphology, and deposition rate of Nd-Fe-B thick-film magnets fabricated by pulsed laser deposition (PLD) were investigated. Reducing the laser fluence on the target reduces the remanence and increases the Nd content and consequently the coercivity of the prepared films. The spot size of the laser beam was found to affect the film surface morphology, the deposition rate, and the reproducibility of the magnetic properties of the prepared films. Reducing the spot size reduces the number of droplets and the reproducibility of the magnetic properties and increases the droplet size. Controlling the spot size of the laser beam enabled us to maximize the deposition rate. Consequently, a coercivity of 1210 kA/m and a remanence of 0.51 T were obtained at a deposition rate of 11.8 lm/(hÁW). This deposition rate is 30% greater than the highest previously reported deposition rate by PLD.

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Section: Introductionmentioning

confidence: 99%

Effect of laser beam parameters on magnetic properties of Nd–Fe–B thick-film magnets fabricated by pulsed laser deposition

Fukunaga

Kamikawatoko

Nakano

et al. 2011

Journal of Applied Physics

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“…Although excellent magnetic properties have been reported for anisotropic thick film-magnets [2]- [4], isotropic ones are also attractive, because they are easily magnetized multi-polarly, and the multi-polar magnetization increases output torque of a motor. We have already reported a design example of a small motor consisting of isotropic film-magnets which has output torque larger than that of a motor consisting of an anisotropic magnet [5]. An increase in the remanence is expected to improve characteristics of small motors using a magnet-rotor with multi-polar pairs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Preparation Condition on Magnetic Properties of ${\rm Nd-Fe-B}/\alpha-{\rm Fe}$ Multi-Layered Thick Film-Magnets Prepared by PLD Method

et al. 2012

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multi-layered thick film-magnets were synthesized by pulse laser deposition (PLD) method from a -Fe composite target. In order to improve magnetic properties and their reproducibility, effects of the stacking period of layers, , the target-substrate distance, , and the laser beam energy on a target, , on them were studied. The reproducibility of magnetic properties was improved significantly by decreasing . In particular, the standard deviation of the Nd content was suppressed within 3%, when was reduced from a value higher than 200 to 25 . An increase in and selection of a suitable value improved the maximum energy product . The largest value obtained in this investigation was 112 , which is higher than the values reported previously for isotropic film-magnets thicker than 10. Origins of superior magnetic properties were discussed from the viewpoints of suitable interlayer exchange interaction between Nd-Fe-B and -Fe layers and morphology of prepared film-magnets.Index Terms-Layered structure, nanocomposite magnet, Nd-Fe-B, pulse laser deposition (PLD) method, thick film-magnet.

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“…We have already estimated that the magnetic torque of a laminated isotropic Fe 3 B/R 2 Fe 14 B film prepared from melt-spinning method with double pole pairs is much larger than that of an anisotropic bulk magnet with a single pole pair. 3 We also have developed a small bonded magnet rotor with a relative density of 80% prepared from isotropic a-Fe/Pr 2 Fe 14 B flakes. It was found that the magnet torque of a small motor using the bonded magnet increased by 114% compared with that of an conventional magnet rotor prepared from Nd 2 Fe 14 B flakes.…”

Section: Introductionmentioning

confidence: 99%

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

Yamashita

Nishimura

Kobayashi

et al. 2011

Journal of Applied Physics

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An advanced preparation method was carried out to obtain a magnetized cylindrical micro rotor fabricated from directly consolidated isotropic a-Fe/Pr 2 Fe 14 B nanocomposite thick-films with self-bonding layer. A magnetic torque of the above film with the remanence value of 0.97 T, the coercivity value of 650 kA/m, and the (BH) max value of 142 kJ/m 3 was investigated under different field strengths. Namely, magnetic torque of the above-mentioned rotor with a single pole pair increased by 117%, compared with that of Fe 3 B/Nd 2 Fe 14 B films with the remanence value of 1.1 T, the coercivity value of 334 kA/m, and the (BH) max value of 95 kJ/m 3. It was found that the use of a-Fe/Pr 2 Fe 14 B films is effective in obtaining a multipolarly magnetized micro rotor with highly dense torque as well as magnetic stability. V

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Investigation on Magnetic Torque of Multi-Polarly Micro Rotor Using Shape-Magnetic-Anisotropy

Cited by 12 publications

References 3 publications

Effect of laser beam parameters on magnetic properties of Nd–Fe–B thick-film magnets fabricated by pulsed laser deposition

Effect of laser beam parameters on magnetic properties of Nd–Fe–B thick-film magnets fabricated by pulsed laser deposition

Effect of Preparation Condition on Magnetic Properties of ${\rm Nd-Fe-B}/\alpha-{\rm Fe}$ Multi-Layered Thick Film-Magnets Prepared by PLD Method

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

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