Gary Wysin, Condensed Matter Physics
Magnetism Theory and Simulation
Cachoeira do Pico do Bonê, Serra do Brigadeiro, Minas Gerais, Brazil, Oct. 2004.
Recently returned from sabbatical leave at
Universidade Federal de Santa Catarina, Florianopólis, Brazil.
working in the
Department of Physics
and at
Universidade Federal de Viçosa, Minas Gerais, Brazil.
Best way to contact me: wysin@phys.ksu.edu
Permanent address:
309 Cardwell Hall,
Department of Physics,
Kansas State University,
Manhattan KS 66506-2601, USA.
(785) 532-1628 / FAX: (785) 532-6806
Congratulations, however you did it, you found me! If you are interested in
theoretical physics, or in making computer simulations in physics, or just
want to know what I am doing, this is a good place to start.
There's an interesting world of magnetism, from the very applied, such as all
those MegaBytes of magnetic disk storage you are now using, to the very abstract, which
includes solitons and vortices. I use a combination of mathematical physics,
statistical physics, solid state physics, quantum mechanics, and common sense to figure out how
to get computers to calculate what I want to know about various magnetic materials.
It is all based on models of interacting spins on a lattice,
which are the microscopic magnetic moments (arrows) that can cooperate to
form what we see in magnetized objects, usually by all trying to be parallel.
What I do in physics:
Teaching:
Disclaimer: If you can't see any problem solutions for some class,
unfortunately I had to limit the access for one reason or another,
sorry!!! That way you will have more pleasure working the problems
out yourself!
- Physical World I 101
- Introductory course on many topics in science, especially physics and chemistry.
Go here to see Review Questions and Problems and other Physical World I information.
- General Physics I Lecture 113
- 2007-2009 course.
Motion, mechanics, energy, waves and thermodynamics.
Lecture notes and Exam solutions.
- General Physics II Lecture 114
- 2007-2009 course.
Electricity, magnetism, optics, quantum and nuclear physics.
Lecture notes and Exam solutions.
- General Physics II Recitation 114
- Electricity, magnetism, and beyond.
Brief summaries of the concepts and formulas for important topics.
- Descriptive Astronomy 191
- Go here to see Review Questions and Problems
and other Introductory Astronomy information.
- Engineering Physics I Lecture/Studio 213/223
- Newton's Laws, thermodynamics, work, energy and all that.
Go here to see my scribblings of solved EPI physics problems,
and other EPI information. From Spring 2004.
- Engineering Physics II Lecture 214/224
- Electric and magnetic fields, circuits, optics.
Go here to see my EPII lecture notes and other information.
From Fall 2003.
- Applied Quantum Mechanics 709
- Overview of basic applications of quantum mechanics in
modern physics. Go here to see my lecture notes and other information.
- Physics Journal Club 806
- Fall 2005 course.
Click to see the schedule of teaching and research talks that took place.
- Mathematical Methods for Physicists 801
- Advanced mathematical techniques for solving theoretical physics problems.
- Quantum Mechanics-I 811
- Graduate level quantum mechanics. Fundamentals, Schrodinger Eqn.,
wavefunctions, representations, etc.
- Quantum Mechanics-II 911
- Graduate level quantum mechanics. Scattering, spin, rotations, perturbation theory,
introduction to relativistic theory.
- Electrodynamics-I 831
- Fall 2005 course.
Graduate level analysis/application of Maxwell's equations, advanced mathematical
techniques for elecrostatics, magnetostatics, time-dependent fields, electromagnetic waves.
- Electrodynamics-II 931
- Spring 2006 course.
Graduate level analysis/application of Maxwell's equations for
electromagnetic radiation from antennas and moving particles,
relativistic EM fields.
Research:
Some short descriptions of recent and not-so-recent work.
- Publications
- My recent and not so recent papers, proceedings articles, and zipped RevTex preprints.
- Research Experiences for Undergraduates, Summer 2008
- Introductory information about a project on control of magnetic vortex properties.
- Physics Research Topics
- Some of the physics problems I've worked on, concerning vortices,
domain walls, fine magnetic particles, and their hysteresis.
- Computational Techniques and Simulations
- How some of the calculations are done, including Monte Carlo,
Spin Dynamics, and Numerical Diagonalization.
- Optical Modes in Micro-Cavities (image -->)
- Diagrams of the vibrations of electromagnetic fields (or
elastic membranes like drums!) when constrained to occur within
equilateral triangles or hexagons. Nice wavefunction plots!
- Vortex-Spinwave Scattering Results
- Some technical notes on my calculations of the spectrum of
spinwaves in the presence of a magnetic vortex in two dimensions.
- Notes on Numerical Quantum Mechanics
- Some technical notes on recent Quantum Monte Carlo methods
for spin models.
C/X11-Programming
Some programs I wrote related to research and teaching.
You'll need a c-compiler, UNIX and X11 libraries to compile and run them.
- xgrph.zip: A UNIX X11 xy-plotting program.
-
A UNIX c-program that quickly opens a window and draws plots of xy data
from data files given to it. It's a fast alternative to using gnuplot or
xvgr/xmgr. Hit 'h' for help window which shows all single keyboard stroke
commands. Includes 'p' and 'l' for portrait or landscape PostScript
printout.
Source code in C/X11 is here: xgrph.zip.
For a sample data file, click --> sample_data .
If you use it and find bugs please report them to me at wysin@phys.ksu.edu.
-
Typical graph drawn by xgrph with data for multiple curves inputted from
several files.
- xorbit.c: A Planetary Orbit Simulation Program
- A UNIX c-program that gives graphical demonstration of elliptical
planetary orbits. For C/X11 source code click here:
xorbit.c.
- gas2d.zip: A 2-Dimensional Gas Simulation Program
- A UNIX c-program that simulates motion and collisions of a mixture of
2D balls, with gravity, time-reversal, and average kinetic energy measurement.
(Under construction). For C/X11 source code click here:
gas2d.zip.
Light,
intermediate, and
heavy balls in thermal equilibrium in a
gravitational field, from gas2d simulation.
- xmc.zip: A Monte Carlo and Spin Dynamics Simulation Program
- A UNIX c-program that demonstrates how the spins in a magnet move around
under the influence of temperature only (xmc) or under temperature and time (xmd).
Source code is here:
xmc.zip (Monte Carlo sith spin dynamics).
Simulation of anisotropic Heisenberg model near its critical temperature,
showing calculations of absolute magnetic moment in XY plane, susceptibility,
internal energy, specific heat, and vorticity density. Blue/white arrows
indicate spins with +/- components out of the XY plane. Red +/- indicate
vortices/antivortices.
Other Activities:
-
Kansas Advanced Semiconductor Coordinated Laboratory,
- Newly formed Research Center involving Physics and Engineering.
- Co-workers on these projects
- It's a small world. These are some of the people I visit and work with.
- Photo album
- My art work.
Physics Department:
Other Links At KSU:
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since 2006/02/10.
Last update: Tuesday February 03 2009.
email to -->
wysin@phys.ksu.edu
Konza Prairie, July 1995.