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Computer Program Detail Page

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Quantum Magnetism Analysis Model
written by Larry Engelhardt, Chad Garland, Cameron Rainey, and Austin Freeman
The Quantum Magnetism Analysis Model was created to help students as well as researchers who are studying magnetism.  It provides a very simple interface for defining (theoretical) quantum spin models; sliders are automatically created to vary the parameters in the models; and several plots are automatically created to visualize the results.  Within the program, several measured (experimental) data sets are included for a variety of real molecules.  These provide the opportunity to experience the modeling process by varying the parameters in the model and exploring how the simulated results compare to the measured data.

The interactions between neighboring quantum magnetic moments ("spins") are modeled using the Heisenberg model; calculations are carried out by numerically diagonalizing the matrix representation of the Heisenberg Hamiltonian; and plots display the energy spectrum, magnetization, and magnetic susceptibility as a function of temperature and magnetic field.

This simulation is a "Fully Integrated Tool for Magnetic Analysis in Research & Teaching," so we also refer to it with the acronym "FIT-MART".  FIT-MART was developed using the Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking ejs_fitmart.jar file will run the package if Java is installed.  In future versions of this simulation, curricular materials will be included to help students to learn about magnetism, and automated fitting routines will be included to help researchers quickly and easily model experimental data.

FIT-MART was developed using the Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking ejs_fitmart.jar file will run the package if Java is installed.

Please note that this resource requires at least version 1.6 of Java.
1 supplemental document is available
1 source code document is available
Subjects Levels Resource Types
Quantum Physics
- General
- Multi-particle Systems
- Spin and Finite Dimensional Systems
- Upper Undergraduate
- Graduate/Professional
- Lower Undergraduate
- Collection
- Instructional Material
= Curriculum support
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Professional/Practitioners
- Educators
- application/java
  • Currently 4.0/5

Rated 4.0 stars by 1 person

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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license. Additional information is available.
Rights Holder:
Larry Englehardt
Record Cloner:
Metadata instance created July 27, 2012 by Wolfgang Christian
Record Updated:
July 10, 2015 by Wolfgang Christian
Last Update
when Cataloged:
July 27, 2012

Research With Spin Systems

Author: MuckrakerW M
Posted: July 10, 2015 at 4:04PM

Building a spin system with fit-mart is based on crystalline structures already researched. Most of the papers for reference or study cost at least $35.00. The only other option is to find crystalline compounds created in nature which could be analogous to your own spin chain or cluster. I do believe the Internet will have information about such compounds because I have knowledge of both inorganic and organic chemistry. But without these papers as reference you're working somewhat in the blind.

Moreover this is only a simulation and unless you have access to a physical lab with the necessary chemicals you cannot built these crystalline structures and test them.

The abstract portion of the experimental data provides miniscule information with an image most often of the spin chain or cluster but still you are limited in understanding since in order to get the whole picture of what is going on you must buy the reference paper.

I do believe this is the catch for using the simulator....

» reply

Re: Research With Spin Systems

Author: Wolfgang
Posted: Jul 10, 2015 at 10:53PM

A preprint of the article describing FIT-MART is available on the ArXIV server.

» reply

Spin Systems - Multiparticle

Author: MuckrakerW M
Posted: June 25, 2015 at 1:14AM

I found this simulator just what I needed to better understand spin-1/2, spin-0 and spin-1 particles. Since photons theoretically have zero mass the X parameters/fields in Tesla are usually set to zero. I'm not sure if the Lande g factor or gyromagnetic ratio g or the Bohr magneton apply to photons, bosons, since they carry no charge. Anyway I set these parameters to zero as well.

On the other hand all these parameters do play a major role in defining the electron. Especially the Bohr magneton for the direct behavior of the electron in a magnetic field. In effect, this is a great simulator for learning to understand the properties of charged particles fundamentally as well as bond energies and particle interactions.

If only there was more practical information on the use of the data and the simulator itself. That is, more on learning to read the plots more scientifically. Otherwise this simulator is awesome.

Thanks guys for a great quantum mechanical tool to help me with my research....

» reply

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Record Link
AIP Format
L. Engelhardt, C. Garland, C. Rainey, and A. Freeman, Computer Program QUANTUM MAGNETISM ANALYSIS MODEL, Version 1.0 (2012), WWW Document, (
L. Engelhardt, C. Garland, C. Rainey, and A. Freeman, Computer Program QUANTUM MAGNETISM ANALYSIS MODEL, Version 1.0 (2012), <>.
APA Format
Engelhardt, L., Garland, C., Rainey, C., & Freeman, A. (2012). Quantum Magnetism Analysis Model (Version 1.0) [Computer software]. Retrieved May 4, 2016, from
Chicago Format
Engelhardt, L, C. Garland, C. Rainey, and A. Freeman. "Quantum Magnetism Analysis Model." Version 1.0. (accessed 4 May 2016).
MLA Format
Engelhardt, Larry, Chad Garland, Cameron Rainey, and Austin Freeman. Quantum Magnetism Analysis Model. Vers. 1.0. Computer software. 2012. Java 1.6. 4 May 2016 <>.
BibTeX Export Format
@misc{ Author = "Larry Engelhardt and Chad Garland and Cameron Rainey and Austin Freeman", Title = {Quantum Magnetism Analysis Model}, Month = {July}, Year = {2012} }
Refer Export Format

%A Larry Engelhardt
%A Chad Garland
%A Cameron Rainey
%A Austin Freeman
%T Quantum Magnetism Analysis Model
%D July 27, 2012
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Engelhardt, Larry
%A Garland, Chad
%A Rainey, Cameron
%A Freeman, Austin
%D July 27, 2012
%T Quantum Magnetism Analysis Model
%7 1.0
%8 July 27, 2012

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Quantum Magnetism Analysis Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Quantum Magnetism Analysis Model.

relation by Wolfgang Christian
Is Referenced By an article preprint that describes the theory used by the software.

A preprint of "FIT-MART: Quantum Magnetism with a Gentle Learning Curve" hosted on ArXIV.

relation by Wolfgang Christian

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