Effect of nitrogen content on magnetic properties of Sm/sub 2/Fe/sub 17/N/sub x/ (0&lt;x&lt;6)

Iriyama, Takahiko; Kobayashi, Kurima; Imaoka, Nobuyoshi; Fukuda, Takashi; Katô, Hiroaki; Nakagawa, Yasuaki

doi:10.1109/20.179482

Cited by 253 publications

(60 citation statements)

References 9 publications

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“…[1][2][3] It has been argued that bulk Sm-Fe-N magnets cannot be produced because of the thermal decomposition, but this drawback is being overcome according to recent research activity. [4][5][6][7] On the other hand, many researchers have been striving to improve the coercivity of the ingredient powder for producing bulk magnets by refining particle size.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale electron microscopy of overnitrided Sm-Fe-Mn-N powder

Hosokawa

Takagi

2018

AIP Advances

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Multi-scale electron microscopy technique that combines transmission electron microscopy (TEM) and focused ion beam - scanning electron microscopy (FIB-SEM) was utilized to investigate the influences of the change in microstructure of Sm2(Fe0.95Mn0.05)17Nx by overnitridation on the magnetic properties. The recent high-contrast backscatter electron imaging technique in SEM machines enabled us to reveal the formation events of cell-like microstructure from a quite large field of view. In addition, detailed TEM observations revealed the crystallographic orientations of the cells as well as the local chemical fluctuation. The combination of these techniques allows us to understand the microstructural hierarchy in this material, verifying that the original orientations of the individual particles are inherited to the nanocrystalline cells formed by overnitridation.

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Section: Introductionmentioning

confidence: 99%

Multi-scale electron microscopy of overnitrided Sm-Fe-Mn-N powder

Hosokawa

Takagi

2018

AIP Advances

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“…Sm-Fe-N bulk magnets cannot be produced by the sintering of Sm-Fe-N powder, however, due to the poor thermal properties of the powder. [6][7][8] Therefore, it would be desirable if the magnetic properties of the Sm 2 Fe 17 phase could be increased without the need for nitrogenation. Although several studies were carried out on the Sm 2 Fe 17 phase at the early stage of such research, relatively little attention has been paid to this material due to their easy-plane anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Effects of titanium and zirconium addition on magnetic properties of Sm2Fe17 melt-spun ribbons

Saito

Nishio–Hamane

2018

AIP Advances

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The structures and magnetic properties of Sm2(Fe,Co)17 melt-spun ribbons with Ti and Zr added in the ratios of (Sm1-xZrx)2(Fe0.7Co0.3)17-yTiy (x=0–0.3, y=0–2.0) were investigated. The (Sm1-xZrx)2(Fe0.7Co0.3)17-yTiy (x=0–0.3, y=0–2.0) melt-spun ribbons showed low coercivity, but after annealing their coercivity differed according to the amounts of Zr and Ti contained. Structural studies revealed that the addition of Ti and Zr to the Sm2(Fe,Co)17 alloys resulted in a change from the Th2Zn17-type phase to the ThMn12-type phase. It was found that the specimens with a low coercivity retained the Th2Zn17-type phase (an average diameter of 100 nm), whereas the specimens with a high coercivity mainly consisted of the ThMn12-type phase (an average diameter of 30 nm). Among the specimens tested, (Sm0.7Zr0.3)2(Fe0.7Co0.3)15.5Ti1.5 melt-spun ribbon with the ThMn12-type phase exhibited a high coercivity of 4.0 kOe.

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“…[1][2][3][4][5] In particular, Sm 2 Fe 17 N 3 fine powders with average sizes of 2-3 mm have been used as bonded magnets. However, fine powders suffer from poor oxidation resistance and thermal instability of coercivity.…”

Section: Introductionmentioning

confidence: 99%

Magnetization Process in Sm2Fe17N3 Fine Powders Studied Using Lorentz Microscopy and Electron Holography

Kim

Shindo

et al. 2010

Mater. Trans.

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The magnetization process for Sm 2 Fe 17 N 3 fine powders was studied by Lorentz microscopy and electron holography. In ex situ observations under the external magnetic field produced by an electromagnet, the change of the domain wall position was observed by Lorentz microscopy, while the drastic change in the distribution of lines of magnetic flux outside the fine powders was clarified by electron holography. Through in situ observations with a piezodriving holder with localized magnetic field produced by a sharp magnetic needle, the shift of domain walls was observed in real time by Lorentz microscopy. Finally, on the basis of Lorentz microscopy observations, the magnetization process of Sm 2 Fe 17 N 3 fine powders was briefly discussed taking into account a hysteresis loop.

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Effect of nitrogen content on magnetic properties of Sm/sub 2/Fe/sub 17/N/sub x/ (0<x<6)

Cited by 253 publications

References 9 publications

Multi-scale electron microscopy of overnitrided Sm-Fe-Mn-N powder

Multi-scale electron microscopy of overnitrided Sm-Fe-Mn-N powder

Effects of titanium and zirconium addition on magnetic properties of Sm2Fe17 melt-spun ribbons

Magnetization Process in Sm<SUB>2</SUB>Fe<SUB>17</SUB>N<SUB>3</SUB> Fine Powders Studied Using Lorentz Microscopy and Electron Holography

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