# Java Hysteresis Simulation

## version 0.9a, updated 24 May 1995

## author: Paul Houle

Our applet simulates
hysteresis using a
random-field ising model developed by
Jim Sethna and his group.
You can run our model at three different values of the random field,
which determines the influence of disorder on the system. With less
disorder, such as *R=0.5*, you will observe very large
avalanches as most of the system changes magnetization as once.
*R=1.0* is just about critical and you will observe both very
small and very large avalanches. (*R=1.0* is certainly critical
for systems of dimension greater than 2, but we do not know for
certain if there is a critical point in 2-d).
*R=2.0* is well above critical and you will see mostly small
avalanches.

You can download the source code,
browse the
class documentation and source code
for our applet, or
find out more about the physics of hysteresis.

This applet is part of the NSF project
Integration of Information Age Networking and Parallel Supercomputer
Simulations into University General Science and K-12 Curricula.

Copyright © 1997
honeylocust media systems,
contact paul@honeylocust.com