Two- and three-dimensional calculation of remanence enhancement of rare-earth based composite magnets (invited)
- 15 November 1994
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 76 (10) , 7053-7058
- https://doi.org/10.1063/1.358026
Abstract
Micromagnetic calculations using a finite element technique rigorously describe the magnetic properties of novel, isotropic rare‐earth‐based composite magnets. Numerical results obtained for a composite material of Nd2Fe14B, SmCo5 or Sm2(Fe0.8Co0.2)17N2.8 and α‐Fe particles show that remanence, coercivity, and coercive squareness sensitively depend on microstructural features. Interparticle exchange interactions enhance the remanence by about 60% with respect to noninteracting particles for a mean‐grain size approaching the exchange length of the soft magnetic phase and a significant percentage of α‐Fe. On the other hand, exchange interactions between the phases suppress the nucleation of reversed domains and thus preserve a high coercive field. Therefore, optimally structured, isotropic composite magnets show remarkably high energy products exceeding 400 kJ/m3.This publication has 21 references indexed in Scilit:
- Microstructure analysis of nanocrystalline Fe-Nd-B ribbons with enhanced hard magnetic propertiesJournal of Magnetism and Magnetic Materials, 1993
- New nanocrystalline high-remanence Nd-Fe-B alloys by rapid solidificationJournal of Magnetism and Magnetic Materials, 1993
- Nucleation field and energy product of aligned two-phase magnets-progress towards the '1 MJ/m/sup 3/' magnetIEEE Transactions on Magnetics, 1993
- Remanence enhancement in mechanically alloyed isotropic Sm7Fe93-nitrideJournal of Magnetism and Magnetic Materials, 1993
- B materials: Intrinsic properties and technological aspectsReviews of Modern Physics, 1991
- The exchange-spring magnet: a new material principle for permanent magnetsIEEE Transactions on Magnetics, 1991
- Size dependence of the nucleation field of rectangular ferromagnetic parallelepipedsJournal of Magnetism and Magnetic Materials, 1991
- Meltspun permanent magnet materials containing Fe3B as the main phaseJournal of Magnetism and Magnetic Materials, 1989
- Nucleation Fields in Periodic MultilayersPhysica Status Solidi (b), 1989
- A mechanism of magnetic hysteresis in heterogeneous alloysPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1948