What is a demagnetization factor?

A demagnetization factor (N) describes how the shape of a magnetic body affects its internal magnetic field. It ranges from 0 to 1, with N_x + N_y + N_z = 1 for any geometry. Higher N values indicate stronger demagnetizing effects along that axis.

What geometries does Demagcal support?

Demagcal calculates demagnetization factors for six geometries: ellipsoids, rectangular prisms (using Aharoni's formula), cylinders (using Joseph's formula), spheres, thin films, and infinite rods.

What is Stoner-Wohlfarth analysis?

Stoner-Wohlfarth analysis is a model for single-domain magnetic particles that calculates the competition between magnetocrystalline anisotropy and shape anisotropy to determine magnetic behavior and switching fields.

Demagnetization Factor Calculator

Shape & Dimensions

Geometry Type:

Semi-axis a (x) [nm]:

Semi-axis b (y) [nm]:

Semi-axis c (z) [nm]:

Length (x) [nm]:

Width (y) [nm]:

Height (z) [nm]:

Thickness (z) [nm]:

Diameter (xy) [nm]:

Diameter [nm]:

Infinite Thin Film (2D Limit)

Thickness ≪ lateral dimensions

Infinite Rod (1D Limit)

Length ≫ diameter

Material Properties

Saturation Magnetization ($M_s$):

Uniaxial Anisotropy ($K_u$) [MJ/m³]:

Crystalline Easy Axis Direction:

⊥ Out-of-plane — In-plane

Advanced Options

Enter dimensions and magnetic properties for complete Stoner-Wohlfarth analysis

Source: R. I. Joseph, J. Appl. Phys. 37, 4639 (1966)

Enter dimensions and magnetic properties for
                                    complete Stoner-Wohlfarth analysis

Source: A. Aharoni, J. Appl. Phys. 83, 3432–3434 (1998)

Enter diameter and magnetic properties for complete Stoner-Wohlfarth analysis

Theoretical limiting case for maximum shape anisotropy

Theoretical limiting case for intermediate shape anisotropy

Enter semi-axes and magnetic properties for triaxial ellipsoid

Source: J. A. Osborn, Phys. Rev. 67, 351 (1945)

Demagnetization Calculator

Shape & Dimensions

Material Properties