2-D Ising Model
Spin up and spin down in a 2-D 60x60 ferromagnetic Ising
system are represented below by
blue and
red squares.
The applet gives Monte-Carlo updates of the lattice
at a rate of about 3 per second (you can alter the applet
code to get faster updates).
Click on the thermometer (left bar at the
right of the lattice) to change the temperature T
(in units of J=k=1) and on the magnetic field bar (right bar)
to change the value of the magnetic field H in the direction
of the up spins.
You can see with this simple system
spontaneous magnetization, hysteresis, and other
interesting effects such as critical slowing down and the
creation of metastable magnetic domains.
Play with it until you cannot stand it any longer.
Java applet
source code
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