Simulation of alnico coercivity

Abstract

Micromagnetic simulations of alnico show substantial deviations from Stoner-Wohlfarth behavior due to the unique size and spatial distribution of the rod-like Fe-Co phase formed during spinodal decomposition in an external magnetic field. The maximum coercivity is limited by single-rod effects, especially deviations from ellipsoidal shape, and by interactions between the rods. Both the exchange interaction between connected rods and magnetostatic interaction between rods are considered, and the results of our calculations show good agreement with recent experiments. Unlike systems dominated by magnetocrystalline anisotropy, coercivity in alnico is highly dependent on size, shape, and geometric distribution of the Fe-Co phase, all factors that can be tuned with appropriate chemistry and thermal-magnetic annealing.

References in corpus (3)

• The design and verification of Mumax3
• LaBonte's method revisited: An effective steepest descent method for micromagnetic energy minimization
• Microstructural and magnetic property evolution with different heat-treatment conditions in an alnico alloy

Cited by in corpus (3)

• Micromagnetics of rare-earth efficient permanent magnets
• On spinodal decomposition in alnico---a transmission electron microscopy and atom probe tomography study
• Interplay between Exchange Interaction and Magnetic Shape Anisotropy of ferromagnetic nanoparticles in a non-magnetic matrix for rare-earth-free permanent magnets