Origin of coercivity in an anisotropic Sm(Fe,Ti,V)12-based sintered magnet

Zhang, J.S.; Tang, Xin; Sepehri-Amin, H.; Srinithi, A.K.; Ohkubo, T.; Hono, K.

doi:10.1016/j.actamat.2021.117161

Cited by 27 publications

(11 citation statements)

References 75 publications

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“…In the solid‐metal/liquid‐metal and solid‐non‐metal/liquid‐non‐metal systems, liquid‐phase sintering rivals solid‐state sintering in the enhancement of diffusion and mass transport, which ultimately promotes porosity elimination, grain growth and rapid densification at lower temperature. Typical examples include: permanent magnets (NdFeB , [ 26 ] SmFeTiV [ 27 ] ), electrical contacts (WCu [ 28 ] ), bronze (CuSn [ 29 ] ), shape memory alloys (NiTiNb [ 30 ] ), 2D materials (MXene‐H 2 O [ 31 ] ), aluminum alloys (AlCuMgSi [ 32 ] ), magnetic ferrites (MnZn, [ 11,33 ] NiZn [ 11 ] ), refractory ceramics (BN, [ 34 ] SiC [ 35 ] ), biological materials (Silica‐H 2 O [ 36 ] ) etc. In the solid‐non‐metal/liquid‐metal system, the objective of liquid‐phase sintering is to take advantage of reduced friction between solid particles and bonding at solid–liquid interface, which will balance strength and ductility in many cemented carbides (WCCo, [ 37 ] NbCTi, [ 38 ] TiBFe, [ 39 ] HfB 2 Ni [ 40 ] etc.).…”

Section: Resultsmentioning

confidence: 99%

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Bai

Liu

Bandaru

et al. 2023

Adv Funct Materials

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Soft magnetic composites (SMCs) are ungently demanded in high‐frequency power electronics for their large magnetization and high electrical resistivity. However, traditional cold‐pressed SMCs are faced with low mechanical strength and insulation instability, which severely restricts their applications. In this study, liquid‐phase sintering techniques to prepare FeSiAl/MoO3 SMCs are orginally employed, where consolidation and insulation of metallic magnetic particles are achieved in one step. The redox reaction between FeSiAl and MoO3 melt greatly reduces the interfacial energy, facilitates fully wetting of FeSiAl particles by MoO3 melt, and promotes the densification process during sintering. In the final FeSiAl/MoO3 SMC, FeSiAl particles are bonded covalently and insulated electrically/magnetically by the resultant Al2O3 transition layer, endowing the SMC with high crushing strength of 250 MPa, cut‐off frequency of 110 MHz, permeability of 35 (@1 MHz), and low power loss of 962 kW m−3 (5 MHz, 5 mT). This study provides alternative concept for designing new SMCs, and broadens the connotation and extension of liquid‐phase sintering.

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Section: Resultsmentioning

confidence: 99%

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Bai

Liu

Bandaru

et al. 2023

Adv Funct Materials

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“…Figure S4b,c, Supporting Information shows the magnetic domain structures for the area composed of both phases. The typical strip domains and vortex domains are observed for the hard magnetic ThMn 12 ‐type phase [ 5 ] and soft magnetic α‐FeCo phase, [ 31 ] respectively. The continuous domain walls and magnetic moments at the interface of two phases (marked areas C and D) depict the strong magnetic exchange coupling.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4] ThMn 12 -type SmFe 12 -based permanent magnets have been recognized as the promising one of potential candidates because of their intrinsically high temperature stability of magnetic properties. [5][6][7][8][9][10][11] However, because of the metastable enhanced pinning effect of domain walls of magnetic hardening shells. [24,25] For the ThMn 12 -type alloys, Tozman et al recently proposed the first core-shell structure composed of Gd-rich shell and Gd-lean core in the (Sm,Gd)Fe 12 -based alloys.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1–4 ] ThMn 12 ‐type SmFe 12 ‐based permanent magnets have been recognized as the promising one of potential candidates because of their intrinsically high temperature stability of magnetic properties. [ 5–11 ] However, because of the metastable characteristics, it still remains a challenge to achieve the single phase structure of SmFe 12 system in bulk magnets. [ 11,12 ]…”

Section: Introductionmentioning

confidence: 99%

“…could effectively improve the stability of Sm(Fe, M) 12 phases. [5,[13][14][15][16][17] Nevertheless, the intrinsic magnetic properties would be seriously decreased; in particular, the μ 0 M s reduced from 1.52 T for the SmFe 12 phase to 1.32 and 1.12 T for the SmFe 11 Ti and the SmFe 11 V phases, respectively. [13,18] In order to address this trade-off, several significant approaches have been developed.…”

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confidence: 99%

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Intrinsically High Magnetic Performance in Core–Shell Structural (Sm,Y)Fe₁₂‐Based Permanent Magnets

Zhao

Lin

et al. 2022

Advanced Materials

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ThMn12‐type SmFe12‐based permanent magnets have exhibited great potential in advanced magnet motors because of their high temperature stability of magnetic properties. However, the applications could be seriously limited due to the trade‐off between phase stability and intrinsic magnetic properties. In this work, an effective solution is demonstrated by constructing the core–shell structure (Sm‐rich shell and Y‐rich core) via a spontaneous spinodal decomposition process. The anisotropy field for the (Sm0.75Y0.25)(Fe0.8Co0.2)11.25Ti0.75 alloy is mostly optimized to be 9.24 T at room temperature. Such an enhancement is ascribed to the pinning process of domain walls by the magnetic‐hardening Sm‐rich shell, which is directly observed by in situ Lorentz transmission electron microscopy and reconstructed by micromagnetic simulation. Moreover, the phase stability and saturation magnetization are simultaneously increased, which is attributed to the synergistic effect of Y, Co, and Ti substitutions. More importantly, the high μ0Ms value of 1.52 T is comparable to the reported (Sm,Zr)Fe12‐based bulk alloys that contain a larger amount of soft α‐Fe phases, indicating that this strategy is more promising toward bulk magnets. The present study provides a significant concept for the development of advanced permanent magnets and also has implications for understanding the structural origin of intrinsic magnetic configurations.

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Large Coercivity and High Remanence in Iron‐Rich 2:17‐Type SmCo Magnets:Effect of Dislocation on Solid‐Solution Precursors

Hu,

He,

Liu

et al. 2024

Adv Funct Materials

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Iron‐rich 2:17‐type SmCo magnets are expected to achieve high performance and relatively low cost. However, inhomogeneous cellular structures usually exist in iron‐rich magnets, resulting in a drastic reduction in coercivity and energy product. Herein, a strategy is proposed to regulate the dislocation by decreasing the Sm content and extending the solid‐solution duration in precursor of iron‐rich SmCo magnet. High‐density dislocations in precursor contributed to 1:5H nucleation, leading to uniform cellular structures in final magnets. As a result, a remarkable intrinsic coercivity of 1.50 T and one of the highest remanences (1.24 T) are simultaneously achieved in the iron‐rich Sm25Co42Fe26Cu5Zr2 (wt%) magnet. This study provides valuable insights into the design and development of iron‐rich 2:17‐type SmCo magnets.

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Origin of coercivity in an anisotropic Sm(Fe,Ti,V)12-based sintered magnet

Cited by 27 publications

References 75 publications

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Intrinsically High Magnetic Performance in Core–Shell Structural (Sm,Y)Fe₁₂‐Based Permanent Magnets

Large Coercivity and High Remanence in Iron‐Rich 2:17‐Type SmCo Magnets:Effect of Dislocation on Solid‐Solution Precursors

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Origin of coercivity in an anisotropic Sm(Fe,Ti,V)12-based sintered magnet

Cited by 27 publications

References 75 publications

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Intrinsically High Magnetic Performance in Core–Shell Structural (Sm,Y)Fe12‐Based Permanent Magnets

Large Coercivity and High Remanence in Iron‐Rich 2:17‐Type SmCo Magnets:Effect of Dislocation on Solid‐Solution Precursors

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Product

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Intrinsically High Magnetic Performance in Core–Shell Structural (Sm,Y)Fe₁₂‐Based Permanent Magnets