Misch metal-Fe-B melt spun magnets with 8 MGOe energy product

Yamasaki, J.; Soeda, Hideo; Yanagida, M.; Mohri, K.; Teshima, N.; Kohmoto, O.; Yoneyama, T.; Yamaguchi, Naoya

doi:10.1109/tmag.1986.1064332

Cited by 36 publications

(7 citation statements)

References 4 publications

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“…It can be seen that the nanocrystalline ribbons prepared at 15 m/s show hard magnetic characteristics, while the amorphous ribbons prepared at 35 m/s reveal soft magnetic properties. Such behavior was also observed by other authors [36].…”

Section: Resultssupporting

confidence: 89%

Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si

Grigoras,

Lostun,

Ababei

et al. 2023

Metals

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In order to develop mischmetal-based permanent magnets with a high performance/cost ratio, Si addition was employed to enhance the magnetic performance of the MM16Fe76-xCo2SixB6 (x = 0–1.5%) ribbons. The ribbons were manufactured by a melt-spinning technique at different velocities. Samples were studied in an as-cast state and after annealing. It was found that the addition of Si in the MM16Fe76-xCo2SixB6 ribbons increased the exchange interaction between Fe atoms in the 2:14:1 phase, reduced the crystal grain size, and increased the exchange coupling between the crystal grains; as a result, the magnetic properties were improved. The coercivity and Curie temperature increased with the increasing Si content from x = 0 to x = 1.5 at%, while the remanence and energy product increased with the addition of Si up to 1% and decreased with further Si addition. The best combination of magnetic properties, such as coercivity of Hc = 8.9 kOe, remanence Mr = 98 emu/g, Curie temperature Tc = 257 °C, and energy product (BH)max = 13.84 MGOe, were obtained in ribbons with 1.0 at. % Si. Thus, it is demonstrated that the addition of Si leads to an improvement of the magnetic properties of MM16Fe76-xCo2SixB6 ribbons, making them good candidates as precursors for the preparation of permanent magnets with an energy product between that of ferrites and Nd-Fe-B magnets.

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Section: Resultssupporting

confidence: 89%

Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si

Grigoras,

Lostun,

Ababei

et al. 2023

Metals

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“…Several investigators found that the magnetic properties of melt-spun ribbons of a given composition depend on the quench rate, i.e., on the wheel velocity V . [96][97][98][99][100][101] When plotted as a function of the wheel velocity V , the coercive force passes through a maximum at an optimum quenching rate (V 0 ). Thus, Croat et al proposed that the peak coercivity corresponds to a grain size equal to the single-domain particle size.…”

Section: Size Effect and Grain Boundary Enhancementmentioning

confidence: 99%

Coercivity mechanisms in nanostructured permanent magnets*

Zhao¹,

Zhao²,

Shen³

et al. 2019

Chinese Phys. B

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Coercivity mechanism in permanent magnets has been debated for many years. In this paper, various models of the coercivity mechanism are classified and re-examined by the comparison and contrast. Coherent rotation and curling models can reveal the underlying reversal mechanism clearly based on isolated grains with elliptic shapes. By contrast, the numerical methods consider inter-grain interactions while simulating the evolution of the spins and hysteresis loops with complicated shapes. However, an exact simulation of magnetic reversal in permanent nanomagnets requires many meshes to mimic the thin domain wall well. Nucleation and pinning are the two main coercivity mechanisms in permanent magnets. The former signifies the beginning of the magnetic reversal, whilst the latter completes it. Recently, it is proposed that the large difference between the intrinsic magnetic properties of the nucleation centers and those of the main phase can result in a large pinning field (self-pinning), which has the attributes of both traditional nucleation and pinning. Such a pinning explains the experimental data of permanent magnets very well, including the enhancement of the coercivity by the grain boundary pinning.

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“…[1][2][3] To take full advantage of rich resources, the effort to reduce the amount of neodymium in Nd-Fe-B magnet by substituting partial Nd with cerium has been made in recent years. For economic and environmental pressures arising from the large-scale consumption of neodymium, [4][5][6][7][8][9][10] some work has been done to apply cerium to magnets. However, the crystal anisotropy field of 4.6 T of Ce 2 Fe 14 B is only approximately half that of Nd 2 Fe 14 B (7.5 T), the saturation magnetization of Ce 2 Fe 14 B (1.17 T) is substantially lower than that of Nd 2 Fe 14 B (1.61 T).…”

Section: Introductionmentioning

confidence: 99%

Effects of spacer layers on magnetic properties and exchange couplings of Nd–Fe–B/Nd–Ce–Fe–B multilayer films

Sun¹,

Zhu²,

Liu³

et al. 2017

Chinese Phys. B

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The influences of the spacer-layer Ta on the structures and magnetic properties of NdFeB/NdCeFeB multilayer films are investigated via DC sputtering under an Ar pressure of 1.2 Pa. An obvious (00l) texture of the hard phase is observed in each of the films, which indicates that the main phase of the film does not significantly change with Ta spacer-layer thickness. As a result, both the remanence and the saturation magnetization of the magnet first increase and then decrease, and the maximum values of 4πM r and H cj are 10.4 kGs (1 Gs = 10 −4 T) and 15.0 kOe (1 Oe = 79.5775 A•m −1 ) for the film with a 2-nm-thick Ta spacer-layer, respectively, where the crystalline structures are columnar shape particles. The measured relationship between irreversible portion D(H) = −∆M irr /2M r and H indicates that the nucleation field of the film decreases with spacer layer thickness increasing, owing to slightly disordered grains near the interface between different magnetic layers.

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Misch metal-Fe-B melt spun magnets with 8 MGOe energy product

Cited by 36 publications

References 4 publications

Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si

Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si

Coercivity mechanisms in nanostructured permanent magnets*

Effects of spacer layers on magnetic properties and exchange couplings of Nd–Fe–B/Nd–Ce–Fe–B multilayer films

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