Magnetization dynamics

The applet below calculates the time evolution of the magnetization of a single domain particle using the Landau-Lifshitz Gilbert equation including damping. The direction of the external magnetic field, the damping constant and the anisotropy of the particle can be changed while the simulation is running.

See also:
Magnetization reversal applet
Stoner-Wohlfarth astroid applet
Spin-torque applet.
Tim Mewes - Mainpage

Simulation of the magnetization dynamics

The simulation solves the Landau-Lifshitz Gilbert equation:

by using a Runge-Kutta-Fehlberg 5(4) algorithm. Where \hat{m} is the unit magnetization vector, \vec{H}_{eff} is the effective field which includes the external magnetic field and a uniaxial or four-fold anisotropy field, \gamma is the gyromagnetic ratio.
Try to change the external field by dragging the tip of the green vector, also try changing the damping constant and changing the anisotropy (including the sign).



Here are some more things to try:


Tips:


Acknowledgements

This material is based upon work supported by the National Science Foundation under Grant No. 0804243. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).
Created with Easy Java Simulations


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