Y
Yukio Takada
Researcher at Toyota
Publications - 19
Citations - 478
Yukio Takada is an academic researcher from Toyota. The author has contributed to research in topics: Magnet & Coercivity. The author has an hindex of 9, co-authored 19 publications receiving 321 citations.
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Journal ArticleDOI
Formation of non-ferromagnetic grain boundary phase in a Ga-doped Nd-rich Nd–Fe–B sintered magnet
TL;DR: In this article, the microstructures of as-sintered and optimally post-sinter annealed Nd-rich Ga-doped Nd−Fe-B magnets were characterized by scanning electron microscopy (SEM) and aberration-corrected scanning transmission electron microscope (STEM).
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Magnetization reversal of exchange-coupled and exchange-decoupled Nd-Fe-B magnets observed by magneto-optical Kerr effect microscopy
M. Soderžnik,M. Soderžnik,Hossein Sepehri-Amin,Takayoshi Sasaki,Tadakatsu Ohkubo,Yukio Takada,T. Sato,Yuji Kaneko,Akira Kato,Thomas Schrefl,Kazuhiro Hono +10 more
TL;DR: In this article, the magnetization reversals of exchange-coupled and exchange-decoupled Nd-Fe-B sintered magnets with coercivities of 1.16 and 1.80 T, respectively, were observed by magneto-optical Kerr effect (MOKE) microscopy.
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Microstructure and coercivity of grain boundary diffusion processed Dy-free and Dy-containing Nd Fe B sintered magnets
T.-H. Kim,Takayoshi Sasaki,Tadakatsu Ohkubo,Yukio Takada,Akira Kato,Yuji Kaneko,Kazuhiro Hono +6 more
TL;DR: In this paper, the formation of a secondary Dy-rich shell within the well-known primary Dyrich shell, which is a key contributor to the 3.0 T coercivity, was investigated in Dy-free and Dy-containing Nd Fe B sintered magnet.
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Role of Ga on the high coercivity of Nd-rich Ga-doped Nd-Fe-B sintered magnet
Takayoshi Sasaki,Yukio Takada,Hiroyuki Okazaki,Tadakatsu Ohkubo,Tetsuya Nakamura,T. Sato,Akira Kato,Yuji Kaneko,Kazuhiro Hono +8 more
TL;DR: In this paper, the effect of Ga on the microstructure and coercivity in Nd-rich Ga-doped nd-Fe-B sintered magnets with different amount of Ga additions was investigated using focused ion beam scanning electron microscope (FIB/SEM), aberration corrected scanning transmission electron microscopy (STEM), three dimensional atom probe (3DAP) and synchrotron X-ray diffraction.
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Magnetization measurements for grain boundary phases in Ga-doped Nd-Fe-B sintered magnet
Kodai Niitsu,Atsuko Sato,Takayoshi Sasaki,R. Sawada,Youngji Cho,Yukio Takada,T. Sato,Yuji Kaneko,Akira Kato,Tadakatsu Ohkubo,Daisuke Shindo,Daisuke Shindo,Kazuhiro Hono,Yasukazu Murakami,Yasukazu Murakami +14 more
TL;DR: In this article, the magnetism of grain boundary (GB) phases in the Nd-rich Ga-doped nd-Fe-B sintered magnet that shows unusually high improvement in coercivity by post-sinter optimal heat treatment was studied using electron holography.