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Dive into the research topics where Masaya Hagiwara is active.

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Featured researches published by Masaya Hagiwara.


IEEE Transactions on Magnetics | 2013

Effects of Solution Treated Temperature on the Structural and Magnetic Properties of Iron-Rich

Yosuke Horiuchi; Masaya Hagiwara; Keiko Okamoto; Tsuyoshi Kobayashi; Masaki Endo; Tadahiko Kobayashi; Takashi Nakamura; Shinya Sakurada

The effects of solution-treatment temperature on the phase constitution, microstructure and magnetic properties of Sm(Co<sub>bal.</sub>Fe<sub>0.35</sub>Cu<sub>0.06</sub>Zr<sub>0.018</sub>)<sub>7.8</sub> were investigated systematically. The formation of Sm<sub>2</sub>Co<sub>7</sub> around the Sm<sub>2</sub>O<sub>3</sub> was confirmed and the volume fraction of Sm<sub>2</sub>Co<sub>7</sub> increases with decreasing solution-treatment temperature. An area without cellular structure was observed around the Sm<sub>2</sub>Co<sub>7</sub> phase in aged specimens solution treated at 1403 K. Thus, it was found that precipitation of Sm<sub>2</sub>Co<sub>7</sub> phase prevents the formation of cellular structure during aging treatment. The coercivity of those magnets was less than 600 kA/m. On the other hand, the obvious formation of cellular structure was confirmed in the case of solution treatment at 1423 K and these magnets showed high coercivity of more than 1000 kA/m. The magnetic properties of M<sub>r</sub> = 1.22 T and H<sub>cJ</sub> = 1011 kA/m have been obtained for Sm(Co<sub>bal.</sub>Fe<sub>0.35</sub>Cu<sub>0.06</sub>Zr<sub>0.018</sub>)7.8 by solution treatment at 1423 K.


Journal of Applied Physics | 2015

{\rm Sm}({\rm CoFeCuZr})_{\rm Z}

Yosuke Horiuchi; Masaya Hagiwara; Masaki Endo; Naoyuki Sanada; Shinya Sakurada

In this study, we investigated intermediate-heat treatment (IHT) at temperatures between those of sintering and solution treatment, and evaluated the effects on the macrostructure, microstructure, and magnetic properties of Sm(Cobal.Fe0.35Cu0.06Zr0.018)7.8. We found that squareness was clearly improved by adopting the IHT, which promotes grain growth. These results indicate that reducing the fraction of grain boundaries by increasing the grain size affects the behavior of domain-wall motion. Magnetic properties of Mr 1.22 T, HcJ 1580 kA/m, and (BH)max 282 kJ/m3 (>35 MGOe) were obtained for Sm(Cobal.Fe0.35Cu0.06Zr0.018)7.8 subjected to IHT at 1453 K.


Archive | 2013

Sintered Magnet

Yosuke Horiuchi; Shinya Sakurada; Keiko Okamoto; Masaya Hagiwara; Tsuyoshi Kobayashi; Masaki Endo; Tadahiko Kobayashi


Materials Transactions | 2014

Influence of intermediate-heat treatment on the structure and magnetic properties of iron-rich Sm(CoFeCuZr)Z sintered magnets

Yosuke Horiuchi; Masaya Hagiwara; Keiko Okamoto; Tsuyoshi Kobayashi; Masaki Endo; Tadahiko Kobayashi; Naoyuki Sanada; Shinya Sakurada


Archive | 2011

PERMANENT MAGNET, AND MOTOR AND POWER GENERATOR USING THE SAME

Yosuke Horiuchi; 陽介 堀内; Shinya Sakurada; 新哉 桜田; Takashi Kobayashi; 剛史 小林; Yoshiko Okamoto; 佳子 岡本; Masaya Hagiwara; 将也 萩原


Archive | 2013

Effect of Pre-Aging Treatment on the Microstructure and Magnetic Properties of Sm(Co,Fe,Cu,Zr)7.8 Sintered Magnets

Yosuke Horiuchi; Shinya Sakurada; Keiko Okamoto; Masaya Hagiwara; Tsuyoshi Kobayashi; Masaki Endo; Tadahiko Kobayashi


Archive | 2012

Permanent magnet, method for producing the same, and motor and generator using the same

Yosuke Horiuchi; Shinya Sakurada; Tsuyoshi Kobayashi; Keiko Okamoto; Masaya Hagiwara


Archive | 2011

Permanent magnet, motor, and power generator

Masaya Hagiwara; 将也 萩原; Shinya Sakurada; 新哉 桜田; Yosuke Horiuchi; 陽介 堀内; Takefumi Kobayashi; 剛史 小林; Yoshiko Okamoto; 佳子 岡本


Archive | 2015

PERMANENT MAGNET AND MANUFACTURING METHOD THEREOF, AND MOTOR AND GENERATOR USING THE SAME

Yosuke Horiuchi; Shinya Sakurada; Masaya Hagiwara; Tsuyoshi Kobayashi; Tadahiko Kobayashi; Naoyuki Sanada


Archive | 2012

Permanent magnet, and motor and dynamo including the same

Yosuke Horiuchi; 陽介 堀内; Shinya Sakurada; 新哉 桜田; Takefumi Kobayashi; 剛史 小林; Yoshiko Okamoto; 佳子 岡本; Masaya Hagiwara; 将也 萩原; Masaki Endo; 将起 遠藤

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