Calculation of Three-dimensional Energy Product for Isotropic Nd2Fe14B Magnet
Source abstract
Abstract
A conventional energy product calculated by the product of the B-field and the H-field is not sufficient for representing the performance of a magnet because it considers the homogeneous and only the uniaxial magnetic properties of the magnet. The conventional energy product has been compared with another energy product obtained by integrating the scalar product of the B-field and the H-field of each cell composed of the three-dimensional components. We investigated a model system by micromagnetic simulation using finite differential method (FDM) and calculated the full hysteresis of the magnet. The model system of a Nd2Fe14B magnet composed of grains with a diameter of about 100 nm was assumed. In the case of the isotropic multi-grain magnet, the energy product calculated by the integration method was 28% larger than the energy product obtained by the conventional way, although a discrepancy between the distribution of the magnetizations and the demagnetizing fields at the reversal process resulted in the decrease of the energy product.
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Research context
OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Applications · Magnetic Properties of Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Powder Materials Division, Korea Institute of Materials Science, Changwon 51508, Korea
Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
Funding
National Research Foundation of Korea (NRF) · Korea Institute of Energy Technology Evaluation and Planning (KETEP)
References (26)
Show source-provided references
1. Perspective and Prospects for Rare Earth Permanent Magnets10.1016/j.eng.2018.11.034 ↗
2. Current progress and future challenges in rare-earth-free permanent magnets10.1016/j.actamat.2018.07.049 ↗
3. Practical Aspects of Modern and Future Permanent Magnets10.1146/annurev-matsci-070813-113457 ↗
4. Coey, J.M.D. (2012). Magnetism and Magnetic Materials, Cambridge University Press.
5. Geometric effects in cylindrical core/shell hard–soft exchange-coupled magnetic nanostructures10.1016/j.jmmm.2020.167599 ↗
6. Magnetic anisotropy—How much is enough for a permanent magnet?10.1016/j.scriptamat.2015.09.021 ↗
7. Energy barrier and effective thermal reversal volume in columnar grains10.1016/S0304-8853(03)00306-8 ↗
8. Magnetic reversal modes in cylindrical nanowires10.1088/0022-3727/46/48/485001 ↗
9. Reversal modes in magnetic nanotubes10.1063/1.2437655 ↗
10. Wave reversal mode: A new magnetization reversal mechanism in magnetic nanotubes10.1016/j.jmmm.2019.165944 ↗
11. Reversal modes in asymmetric Ni nanowires10.1016/j.jmmm.2012.06.023 ↗
12. Cooperative and noncooperative magnetization reversal in alnicos10.1063/1.4976216 ↗
13. Magnetic reversal in three-dimensional exchange-spring permanent magnets10.1063/1.2163837 ↗
14. Magnetic domain switching in Nd-Fe-B sintered magnets with superior magnetic properties10.1080/21663831.2018.1437571 ↗
15. Dynamical aspects of magnetization reversal in the neodymium permanent magnet by a stochastic Landau-Lifshitz-Gilbert simulation at finite temperature: Real-time dynamics and quantitative estimation of coercive force10.1103/PhysRevB.102.020413 ↗
16. Magnetic properties and crystal structure of Nd2Fe14B10.1016/0038-1098(84)90315-6 ↗
17. Field-induced spin reorientation in Nd2Fe14B and Er2Fe14B10.1016/0304-8853(92)90620-4 ↗
18. Improvement of magnetic properties and corrosion resistance of NdFeB magnets by intergranular addition of MgO10.1016/j.jallcom.2007.06.093 ↗
19. Crystal structure and magnetic properties of Nd2Fe14B powder prepared by using high energy milling from elements metal Nd,Fe,B powders10.1088/1742-6596/776/1/012013 ↗
20. Magnetic properties of rare-earth-iron-boron permanent magnet materials10.1063/1.334629 ↗
21. Fast micromagnetic simulations on GPU—recent advances made with10.1088/1361-6463/aaab1c ↗
22. The design and verification of MuMax310.1063/1.4899186 ↗
23. Temperature in micromagnetism: Cell size and scaling effects of the stochastic Landau–Lifshitz equation10.1088/2399-6528/ab31e6 ↗
24. Cell size corrections for nonzero-temperature micromagnetics10.1063/1.1846411 ↗
25. Distribution of non-uniform demagnetization fields in paramagnetic bulk solids10.1063/1.3601117 ↗
26. Demagnetizing Factors of the General Ellipsoid10.1103/PhysRev.67.351 ↗