Permanent Magnet Materials

Müller, K.‐H.; Sawatzki, Simon; Gauß, Roland; Gutfleisch, Oliver

doi:10.1007/978-3-030-63101-7_29-1

Cited by 2 publications

(2 citation statements)

References 163 publications

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“…With good magnetic properties, rare earth magnets (Nd-Fe-B and Sm-Co) are widely used in practice [1][2][3]. However, the issue of the exploitation and utilization of rare earth elements is a global concern because of the scarcity, the monopoly of the nations, the environmental pollution... [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Pham

Nguyen

Lam

et al. 2023

Mater. Res. Express

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In this work, we investigated structure and magnetic properties of Mn65Ga20Al15-xCux (x = 0, 5, 10 and 15) alloy ribbons prepared by melt-spinning method combined with annealing. The annealing temperature was varied from 250°C to 350°C, and the annealing time was changed from 5 h to 20 h. Concentration of Cu and annealing process significantly influence on the formation of the desired phases in the alloy ribbons. The D022-type Mn3Ga crystalline phase with the hexagonal structure, which characterizes hard magnetic property of Mn-Ga based alloys, is enhanced after an appropriate annealing process. The change of grain size after annealing also contributes to the increased coercivity of the alloy ribbons. The highest coercivity of 12.9 kOe and saturation magnetization of 18.7 emu/g are achieved on the alloy ribbons with Cu concentration of 10%. The simultaneous enhancement of these magnetic parameters has an important significance for application possibility of the Mn-Ga based alloys.

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Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Pham

Nguyen

Lam

et al. 2023

Mater. Res. Express

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“…[1][2][3][4][5] This interest comes as a response to the 2011 RE crisis, where the prices for these critical elements increased substantially, allied with the increase in demand for magnetic materials for different applications, including e-mobility, data storage, automation, and generators. [6][7][8] The significance of Mn-Al alloys is justified since it combines relative high intrinsic magnetic properties with the use of noncritical and low-cost elements. [1,2] These points make this material system an interesting as a "gap magnet", meaning that it has potential to fill the magnetic performance gap between Sr-and/or Ba-hexaferrites (cheap and low performance) and RE-based permanent magnets (Sm-Co and Nd-Fe-B-expensive and high performance), which is only partially covered by the use of bonded RE-based magnets.…”

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confidence: 99%

Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing

et al. 2023

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The ferromagnetic Mn–Al–C τ‐phase ( tetragonal structure) shows intrinsic potential to be developed as a permanent magnet; however, this phase is metastable and is easily decomposed to nonmagnetic stable phases, affecting negatively the magnetic properties. Giving the necessity to careful control of its synthesis, the use of a novel approach is investigated using electric current–assisted annealing to obtain pure τ‐phase samples. The temperature and electrical resistance of the samples are monitored during annealing and it is shown that the change in resistance can be used to probe the phase transformation. Upon increase of electric current density, the required temperature for the ferromagnetic phase formation is reduced, reaching a maximum shift of 140 °C at 45 A mm−2. Even though this noticeable shift is achieved, the magnetic properties are not affected showing coercivity of 0.13 T and magnetization of 90 Am2 kg−1, independently from the electric current density used during annealing. Microstructural investigation reveals the nucleation of the τ‐phase at the grain boundaries of the parent ε‐phase. In addition, the existence of twin boundaries upon nucleation and growth of the metastable phase for all evaluated annealing conditions is observed, resulting in similar extrinsic magnetic properties.

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Permanent Magnet Materials

Cited by 2 publications

References 163 publications

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing

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Permanent Magnet Materials

Cited by 2 publications

References 163 publications

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Ferromagnetic Mn–Al–C L10 Formation by Electric Current Assisted Annealing

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Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing