Computational Micromagnetics for Magnetostrictive Actuators
Krishnaprasad, P S.
Date: May 21 - May 24, 2000
Computational micromagnetics plays an important role in design and control of magnetostrictive actuators. A systematic approach to calculate magnetic dynamics and magnetostriction is presented. A method is developed to solve the coupled Landau-Lifshitz-Gilbert equation for dynamics of magnetization and the 1-D elastic motion equation. A hierarchical algorithm using multipole approximation speeds up the evaluation of the demagnetizing eld, reducing computational cost from O(N2) to O(NlogN). A hybrid 3D-1D scheme is adopted to compute the magnetostriction. Numerical results include domain wall dynamics, hysteresis, magnetostriction, and applications to control of actuators.Download Full Paper