Attractive-domain-wall-pinning controlled Sm-Co magnets overcome the coercivity-remanence trade-off

Chen, Hansheng; Wang, Yunqiao; Yao, Yin; Qu, Jiangtao; Fan, Yun; Li, Yuqing; Ringer, Simon P.; Yue, Ming; Zheng, Rongkun

doi:10.1016/j.actamat.2018.10.046

Cited by 103 publications

(16 citation statements)

References 33 publications

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“… 44 In a more general situation, domain walls prefer to stay at the low energy state, for example, trapping at specific boundary locations; thus, the actual position of the domain wall is determined by its energy state. 45 Accordingly, coercivity can be improved by increasing the anisotropy field of possible nucleation sites. 33…”

Section: Discussionmentioning

confidence: 99%

Misorientations across boundary planes in a sintered NdFeB permanent magnet

Xiu-gan

Zhu

2022

RSC Adv.

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Section: Discussionmentioning

confidence: 99%

Misorientations across boundary planes in a sintered NdFeB permanent magnet

Xiu-gan

Zhu

2022

RSC Adv.

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“…[18,[20][21][22][23][24][25] When the domain wall energy density of 2:17R phase is larger than 1:5H phase, the domain walls are located along 1:5H cell boundaries, which is called attractive domain wall pinning. [26] Otherwise, the domain walls are pinned inside 2:17R cells, belonging to repulsive domain wall pinning. The above two types of domain wall pinning have been observed with Lorentz transmission electron microscopy.…”

Section: Introductionmentioning

confidence: 99%

Atomic‐Scale Transition Zones Determined Coercivity in Samarium‐Cobalt Based Permanent Magnets

Liu,

Wang,

et al. 2023

Adv Funct Materials

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SmCo‐based permanent magnets with nanocellular structure exhibit significant advantage for high‐temperature applications. Due to the lack of experimental intrinsic magnetic parameters and unclear nanocellular interface, a fully understanding on coercivity mechanism is still limited. Here the intrinsic magnetic properties of designed two single‐phase alloys representing nanocellular structure at various temperatures are acquired. Using 3D atom probe and high‐angle annular dark‐field scanning transmission electron microscopy, the existence of the nanoscale transition zones located at nanocellular interface is revealed. Moreover, the transition zones exhibiting high magnetocrystalline anisotropy is found to contribute dominantly to the coercivity. The calculated coercivity via micromagnetic simulation considering transition zones agrees well with the tested coercivity at various temperatures. This knowledge deepens the fundamental understanding on coercivity mechanism.

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“…Sm-Co-based permanent magnets have been used in aerospace, electric vehicle motors, wind turbines, sensors and actuators because of high Curie temperatures, excellent temperature stability and good corrosion resistance [1][2][3]. Extensive investigations were conducted to investigate the magnetic properties of Sm-Co alloys with alloying elements Fe, Cu and Zr, which results in a new class of Sm(Co, Fe, Cu, Zr) z (5 ≤ Z ≤ 8.5) permanent magnets [4][5][6][7][8][9][10][11]. It was reported that the addition of Cu into Sm-Co-based permanent magnets would improve their coercivity (H cj ) [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Substitution and Heat Treatment on Phase Formation and Magnetic Properties of Sm12Co88−xCux Melt-Spun Ribbons

Dai

Luo

et al. 2022

Materials

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The phase structure and microstructure of Sm12Co88−xCux (x = 0, 2, 4, 6, 8, 10; at.%) as-cast alloys and melt-spun ribbons prepared via the arc-melting method and melt-spun technology were studied experimentally by X-ray diffraction (XRD) and scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). The results reveal that the Sm12Co88−xCux (x = 0) as-cast alloy contains Sm2Co17 and Sm5Co19 phases, while the Sm12Co88−xCux (x = 2) as-cast alloy is composed of Sm2Co17, Sm2Co7 and Sm(Co, Cu)5 phases. Sm2Co17 and Sm(Co, Cu)5 phases are detected in Sm12Co88−xCux (x = 4, 6, 8, 10) as-cast alloys. Meanwhile, Sm12Co88−xCux ribbons show a single SmCo7 phase, which is still formed in the ribbons annealed at 1023 K for one hour. After annealed at 1123 K for two hours, cooled slowly down to 673 K at 0.5 K/min and then kept for four hours, the ribbons are composed of Sm2Co17 and Sm(Co, Cu)5 phases. The magnetic measurements of Sm12Co88−xCux ribbons were performed by vibrating sample magnetometer (VSM). The results exhibit that the maximum magnetic energy product ((BH)max), the coercivity (Hcj) and the remanence (Br) of the Sm12Co88−xCux ribbons increase generally with the increase in Cu substitution. In particular, the magnetic properties of the ribbons annealed at 1123 K and 673 K increase significantly with the increase in Cu substitution, resulting from the increase in the volume fraction of the formed Sm(Co, Cu)5 phase after heat treatment.

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Attractive-domain-wall-pinning controlled Sm-Co magnets overcome the coercivity-remanence trade-off

Cited by 103 publications

References 33 publications

Misorientations across boundary planes in a sintered NdFeB permanent magnet

Misorientations across boundary planes in a sintered NdFeB permanent magnet

Atomic‐Scale Transition Zones Determined Coercivity in Samarium‐Cobalt Based Permanent Magnets

Effect of Cu Substitution and Heat Treatment on Phase Formation and Magnetic Properties of Sm12Co88−xCux Melt-Spun Ribbons

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