Magnetic properties of Sm–Fe–Ti nanocomposite magnets with a ThMn12 structure

Saito, Tetsuji; Miyoshi, Hiroya; Nishio–Hamane, Daisuke

doi:10.1016/j.jallcom.2011.12.156

Cited by 33 publications

(13 citation statements)

References 23 publications

(30 reference statements)

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“…The coercivity of 5.8 kOe obtained for the SmFe 9 Co 2 Ti alloy, is comparable to the values reported for melt-spun Sm-Fe-(Co)-Ti-(B) alloys [13][14][15][16] (5.0 − 7.7 kOe), and the energy product after even partial alignment (9.9 MGOe) already markedly exceeds the 7.0 − 8.4 MGOe of the isotropic melt-spun alloys. 14,17 The mechanochemical process used in the present work had been only tuned to obtain the most pure 1:12 structure; further improvement of the anisotropy and coercivity of the synthesized particles may still be possible.…”

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confidence: 84%

Low-cost Ce1-xSmx(Fe, Co, Ti)12 alloys for permanent magnets

et al. 2016

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Ce1-xSmxFe9Co2Ti alloys based on the ThMn12-type crystal structure have been synthesized via melt-spinning of prefabricated alloys and via mechanochemical processing of CeO2- Sm2O3- Fe2O3-TiO2- Co - Ca - CaO powder mixtures. Coercive fields up to 0.8 kOe and 2.1 kOe were obtained in annealed melt-spun alloys with x = 0 and x = 0.5, respectively. Submicron, partially anisotropic particles collected after the mechanochemical synthesis for x = 0.5 and x = 1 exhibited coercivity (energy product) of 1.8 kOe (5.4 MGOe) and 5.8 kOe (9.9 MGOe), respectively. The low magnetic anisotropy field of CeFe9Co2Ti alloy requires at least a partial Sm-substitution for Ce in order to develop a reasonably high coercivity.

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confidence: 84%

Low-cost Ce1-xSmx(Fe, Co, Ti)12 alloys for permanent magnets

et al. 2016

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“…It has been reported that the addition or substitution of Ti and Zr increased the stability of RFe 12 compounds and that the resultant compounds exhibited a large saturation magnetization with a high magnetic anisotropy. [13][14][15][16][17][18][19] The crystalline phases of the (Sm 1-x Zr x ) 2 Heat treatment of these specimens was carried out to increase the coercivity. 17 melt-spun ribbon resulted in a drastic change in the microstructure.…”

Section: Resultsmentioning

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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“…Figure 1 compares coercivity values from literature of benchmark Nd2Fe14B-based materials and Sm(Fe,X)12-based materials [20,[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61], as a function of grain size. For the Nd2Fe14B system coercivity values up to 2.95 T have been reported for thin films, while coercivity around 1.95 T have been achieved for sintered bulk samples.…”

Section: Introductionmentioning

confidence: 99%

Twins – A weak link in the magnetic hardening of ThMn12-type permanent magnets

et al. 2021

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Nd2Fe14B-type materials exhibit the highest energy product around room temperature and hence dominate the high-performance permanent magnet market. Intensive research efforts aim at alternative material systems containing less critical elements with similar or better magnetic properties. Nd-and Sm-based compounds with a ThMn12-type structure exhibit intrinsic properties comparable or even superior to Nd2Fe14B. However, it has not been possible to achieve technically relevant coercivity and remanent magnetization in ThMn12-based bulk sintered magnets. Using SmFe11Ti as a prototypical representative, we demonstrate that one important reason for the poor performance is the formation of twins inside micro-crystalline grains. The nature of the twins in SmFe11Ti was investigated in twinned "single crystals" and both bulk and thin film poly-crystalline samples, using advanced electron microscopy and atom probe tomography as well as simulations and compared with benchmark Nd2Fe14B. Both micro-twins and nano-twins show a twin orientation of 57±2 • and an enrichment in Sm, which could affect domain wall motion in this 2 material. Micromagnetic simulations indicate that twins act as nucleation centers, representing the magnetically weakest link in the microstructure. The relation between twin formation energies and geometrical features are briefly discussed using molecular dynamic simulations.

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Magnetic properties of Sm–Fe–Ti nanocomposite magnets with a ThMn12 structure

Cited by 33 publications

References 23 publications

Low-cost Ce1-xSmx(Fe, Co, Ti)12 alloys for permanent magnets

Low-cost Ce1-xSmx(Fe, Co, Ti)12 alloys for permanent magnets

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

Twins – A weak link in the magnetic hardening of ThMn12-type permanent magnets

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