学術雑誌論文

学術雑誌論文

text

NPG Asia Materials. 2024, 16(1), p. 19

Formulation of energy loss due to magnetostriction to design ultraefficient soft magnets

Nature Research

英語

text

2024-03-26

https://doi.org/10.1038/s41427-024-00538-8

Tsukahara H., Huang H., Suzuki K., et al. Formulation of energy loss due to magnetostriction to design ultraefficient soft magnets. NPG Asia Materials 16, 19 (2024); https://doi.org/10.1038/s41427-024-00538-8.

The mechanism of energy loss due to magnetostriction in soft magnetic materials was analytically formulated, and our experiments validated this formulation. The viscosity of magnetic materials causes the resistive force acting on magnetic domain walls through strain due to magnetostriction, and magnetic energy is eventually dissipated by friction even without eddy currents. This energy loss mechanism explains the frequency dependence of the excess loss observed in the experiments, and the excess loss is dominated by the contribution of magnetostriction when the magnetostriction constant exceeds approximately 20 ppm. The random anisotropy model was extended by considering the effect of local magnetostriction as a correction to the magnetocrystalline anisotropy. The effect of magnetostriction was considerably suppressed by the exchange-averaging effect. The estimated effective random magnetoelastic anisotropy for nanocrystalline α-Fe reached as low as 18.6 J/m3, but this static effect could not explain the high excess loss at high frequencies observed in the experiments. The results of this research could provide new design criteria for high-performance soft magnetic materials based on low magnetostriction to reduce the excess loss.

This article is licensed under a Creative Commons Attribution 4.0 International License.

94926

Formulation of energy loss due to magnetostriction to design ultraefficient soft magnets

Nature Research

英語

2024-03-26

NPG Asia Materials

16

1

19

https://doi.org/10.1038/s41427-024-00538-8

https://hdl.handle.net/11094/94926