Nanostructured Exchange-Coupled Magnets

Liu, W.; Liu, Y.; Skomski, Ralph; Sellmyer, David J.

doi:10.1007/1-4020-7984-2_6

Cited by 12 publications

(6 citation statements)

References 247 publications

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“…Intrinsic magnetic properties and theoretical (BH) max limits of 1:5, 2:17 and other phases. [19,98,99] Compound Among RECo 5 compounds, SmCo 5 compounds are obvious candidates for developing coercivity, owing to their extraordinary magnetocrystalline anisotropy. However, the CaCu 5 -type 1:5 phase is stable only at temperature above 805 • C according to Sm-Co phase diagram, [100] below which it decomposes into Sm 2 Co 7 and Sm 2 Co 17 phases.…”

Section: :5 Phasementioning

confidence: 99%

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

Rong

Shen

2018

Chinese Phys. B

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The melt-spinning technique offers an opportunity for tailoring magnetic properties by controlling the structures and microstructures in both single-phase and composite magnets. This review first broadly discusses the principle of cooling control, amorphization, crystallization, annealing, and consolidation of the melt-spun ribbons. The phase, microstructure, and magnetic properties of popular single-phase nanocrystalline magnets are reviewed, followed by the nanocomposite magnets consisting of magnetically hard and soft phases. The precipitation-hardened magnetic materials prepared by melt spinning are also discussed. Finally, the role of intergrain exchange coupling, thermal fluctuation, and reversible/irreversible magnetization processes are discussed and correlated to the magnetic phenomena in both single-phase and nanocomposite magnets.

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Section: :5 Phasementioning

confidence: 99%

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

Rong

Shen

2018

Chinese Phys. B

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“…So, many works have been done on multilayer films or nanostructured films with Nd-Fe-B, PtFe, SmFe or SmCo as the hard magnetic phase. [8][9][10][11][12][13] Later, based on the summary and analysis of previous work on nanostructured exchangecoupled magnets [14] and our work on exchange couplings in magnetic films, [15] it was realized that the higher energy product may be obtained in anisotropic exchange-coupled multilayer magnetic films.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic nanocomposite soft/hard multilayer magnets

Liu¹,

Zhang²

2017

Chinese Phys. B

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Experimental and theoretical researches on nanostructured exchange coupled magnets have been carried out since about 1988. Here, we review the structure and magnetic properties of the anisotropic nanocomposite soft/hard multilayer magnets including some new results and phenomena from an experimental point of view. According to the different component of the oriented hard phase in the nanocomposite soft/hard multilayer magnets, three types of magnets will be discussed: 1) anisotropic Nd 2 Fe 14 B based nanocomposite multilayer magnets, 2) anisotropic SmCo 5 based nanocomposite multilayer magnets, and 3) anisotropic rare-earth free based nanocomposite multilayer magnets. For each of them, the formation of the oriented hard phase, exchange coupling, coercivity mechanism, and magnetic properties of the corresponding anisotropic nanocomposite multilayer magnets are briefly reviewed, and then the prospect of realization of bulk magnets on new results of anisotropic nanocomposite multilayer magnets will be carried out.

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“…These alloys are precursors of permanent magnets, which can be used in a wide range of applications [5][6][7]. An interesting group are Pr-Fe-B-type alloys, in which the Pr 2 Fe 14 B phase is responsible for the high coercivity [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Phase Constitution of the Nanocrystalline Fe₆₅Pr₉B₁₈W₈Alloy Ribbons

et al. 2017

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The aim of the present work was to investigate the phase constitution and magnetic properties of the rapidly solidified Fe65Pr9B18W8 alloy ribbons in the as-cast state and subjected to annealing. The base alloy was prepared by arc-melting of the high purity elements under the Ar atmosphere. The ribbon samples were obtained by the melt-spinning technique under a low pressure of Ar. The studies have shown an amorphous structure of the ribbon in the as-cast state and its soft magnetic properties. Annealing at various temperatures for 5 min resulted in an evolution of the phase constitution that caused changes in magnetic properties of the alloy. The crystallization behavior was studied using differential scanning calorimetry. In order to determine the phase composition of annealed ribbons, X-ray diffractometry was used. The evolution of microstructure and phase constitution was verified by the Mössbauer spectroscopy. The magnetic properties were determined from hysteresis loops measured by a vibrating sample magnetometer in the external magnetic field up to 2 T at room temperature.

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Nanostructured Exchange-Coupled Magnets

Cited by 12 publications

References 247 publications

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

Anisotropic nanocomposite soft/hard multilayer magnets

Magnetic Properties and Phase Constitution of the Nanocrystalline Fe₆₅Pr₉B₁₈W₈Alloy Ribbons

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Nanostructured Exchange-Coupled Magnets

Cited by 12 publications

References 247 publications

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

Anisotropic nanocomposite soft/hard multilayer magnets

Magnetic Properties and Phase Constitution of the Nanocrystalline Fe65Pr9B18W8Alloy Ribbons

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Magnetic Properties and Phase Constitution of the Nanocrystalline Fe₆₅Pr₉B₁₈W₈Alloy Ribbons