Demagcal - Demagnetization Factor Calculator

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Web-based tool for calculating demagnetization factors and magnetic properties of nanostructures.

Features

• Multiple Geometries: Calculate demagnetization factors for:

  • Rectangular Prisms
  • Circular Cylinders
  • Spheres
  • Thin Films
  • Infinite Rods

• Comprehensive Analysis:

  • Demagnetization factors (Nx, Ny, Nz)
  • Shape anisotropy
  • Effective anisotropy
  • Coercive field
  • Thermal stability
  • Exchange length
  • Anisotropy classification

• Advanced Features:

  • Real-time calculations
  • Input validation
  • Keyboard shortcuts
  • Scientific formula rendering with MathJax

Usage

Option 1: Using Python (simplest)

python3 -m http.server 8000

Then open http://localhost:8000 in your browser.

Option 2: Using Node.js

npx serve

Then open the URL shown in the terminal (usually http://localhost:3000).

Option 3: Using any static file server

This is a static web application, so you can use any HTTP server to serve the files.

Using the Calculator

1. Select your geometry type
2. Enter dimensions and magnetic properties
3. Results calculate automatically

Keyboard Shortcuts

• 1-5: Switch between geometry types
• Ctrl/Cmd + Enter: Recalculate
• Esc: Clear input focus

Technical Details

Calculations

• Rectangular Prism: Exact solution from Aharoni (1998)
  J. Appl. Phys. 83, 3432–3434

• Circular Cylinder: Exact solution from Joseph (1966)
  J. Appl. Phys. 37, 4639–4643

• Sphere, Thin Film, and Infinite Rod: Exact analytical solutions

Input Parameters

• Saturation Magnetization (Ms): in kA/m
• Uniaxial Anisotropy (Ku): in MJ/m³
• Exchange Stiffness (Aex): in pJ/m
• Temperature: in Kelvin

Development

Built with vanilla JavaScript, CSS3, and HTML5. No framework dependencies.

File Structure

Demagcal/
├── index.html          # Main application
├── styles.css          # Styling with design tokens
├── app.js             # Application logic
├── calculator-engine.js # Core calculations
├── input-handler.js    # Input validation
├── ui-components.js    # UI rendering
├── demag-factors.js    # Demagnetization formulas
├── utils.js           # Utility functions
└── config.js          # Configuration constants

Author

Created by Afan • July 2025

Questions, feedback, or suggestions? Email: ata159@sfu.ca

License

This project is licensed under the MIT License.