MAGMANet : Overview : Learn about magnetism : Modelling Magnetism : Modelling Magnetism

Modelling Magnetism

1 History of Molecular Magnetism

2 Modelling Magnetism

3 The Stoner-Wohlfarth model

4 New books/publications

About < sm | ms >

< sm | ms > is the name of a technical software project written for the Wolfram Research Mathematica environment. It is designed to perform calculations of interest on Giant Spin Molecular Magnetic systems. The user can vary commonly identified physical characteristics and then see the theoretical results instantly in a graphical screen display.

The software is of great potential as a practical tool to aid the investigation of observed phenomena for magnetic molecules and as an aid to teaching the concepts of Molecular Magnetism at ground state energies for currently tractable systems.

The < sm | ms > project has been built around the Mathematica 5 system to implement numerical quantum theory for Giant Spins. The program itself is a demonstration of the interplay possible between symbolic and fast numeric processing on a seamless platform. However this alloying of the two main computational models has been deliberately kept to a minimum, with execution speed very much the beneficiary.

The project has continuing scope for development and can be considered "open" in that sense. Feedback from our users would thus be an invaluable asset to the continuing effort of supplying MAGMANET with working software that breaks away from traditional models allowing free access to productively innovative calculation technology both online and in the lab itself.

Downloading < sm | ms >

MAGMANet users are free to download and use the Mathematica original from this page and any comments, questions or suggestions are especially welcome and should be directed to jackdyson31@univpm.it.

To download the software simply click this link

< sm | ms >. The software was written on Mathematica 5 for the PC and it is best run on that platform. To install the attachment, simply unzip it into your preferred directory. Make sure a copy of Mathematica 5 is installed on your machine and then do the following:

make a copy of the original folder and store it in a safe place.
start Mathematica 5

From there all you need to do is to go open the file menu and navigate to the folder you unzipped.

The file to click on is called FrontEnd.nb in the folder you just copied. Open that and it will run automatically. When you run for the first time simply press any button on the Frontend and allow it to finish executing (a black toolbox should come up). Then close the software answering no to any save messages. Now close Mathematica 5 and run the FrontEnd again and all should work fine.

A word of warning or two; Never change anything in the main SMMS folder except to move CSV or EPS files from it if you have activated the save flag on the Functionbox menu.

Web < sm | ms > Optimised for Mozilla Firefox

In addition to being available as a download, < sm | ms > is also available as a web enabled service

Web < sm | ms > for those without access to Mathematica 5.0+ or for classroom purposes. The design of the web pages has been deliberately kept intuitive and the programming model is inert from function to function. Testing and writing of the code has so far been restricted to the Mozilla Firefox web browser and MS Internet Explorer 6 available as standard on MS Windows XP.

The calculations themselves are implemented on Mathematica running as a background engine and the web front end is generated using java servlets via jsp technology, all running seamlessly on Wolfram Research's Web Mathematica 2. The original < sm | ms > engine has been in fact completely rewritten for large scale use on the net. However should calculations become excessive users may experience "server time out" messages. Depending on demand this can be modified so please write in and let us know.

The online service is a full implementation of the original program and absolutely no limits have been placed upon its parameter entry. However please do note that web < sm | ms > is still very much under active development and not all of its planned components are yet in place.

Plans for the near future include the provision of online manual pages and enhanced plot options as well as new calculation modules with an option to download theoretical results files.

The ultimate usefulness of this experimental program will derive from the dialog between its regular users and developers. Feedback is therefore strongly encouraged and popularly requested changes to < sm | ms > will be incorporated into future versions.

Web < sm | ms > requirements

The following is absolutely necessary for the online service to function on client (user) machines irrespective of operating system:

Mozilla Firefox or IE web browsers (newer is better)
Javascript and Java runtime language enabled (available as a free downloadable)
Cookies must be enabled on your browser

For the online help pages to correctly render we recommend that users download and install the Mozilla Firefox browser on any platform. However any XML and MathML compliant browser on any platform should suffice.

For users with Mathematica 5+ installed there is no need to do anything else. However if Mathematica 5 or higher is not installed, the help pages will need the Mathematica font foundry installed. This can be downloaded free as a part of the Wolfram Mathreader software which allows any Mathematica file to be read but not processed.

Summarising, in order that the help pages render correctly on client (user) machines irrespective of operating system we recommend:

Mozilla Firefox web browser (newer is better)
Wolfram Notebook Mathreader (available as a free downloadable)