Comparison of Magnetostatic Field Calculation Methods on Two Dimensional Square Grids as Applied to Micromagnetic Standard Problem

Published

April 1, 1999

Author(s)

Robert D. McMichael, Michael J. Donahue, Donald G. Porter, J G. Eicke

Abstract

Magnetization reversal modes and coercivities were calculated for a magnetic particle with thickness: width: length aspect ratios 0.1: 1:5 as a function of the reduced particle width d/1_ex, where d is the particle width and 1_ex is the intrinsic magnetostatic exchange length. With only exchange energy and magnetostatic energy included, the particle corresponds to MAG standard problem No. 2. The problem is modeled with two-dimensional grids of three-dimensional spins, and the results are compared for two methods of calculating magnetostatic energies, the constant the results are compared for two methods of calculating magnetostatic energies, the constant magnetization method and the constant charge method. For both magnetostatic computational methods, the coercivity decreases from H_c/M_s=0.06 0.003 to 0.014 0.003 over the range 3exex increases, the magnetization exhibits three modes of reversal: nearly uniform rotation, transverse switching of end domains followed by propagation of head-to-head domain walls from the ends to the center of the particle, and nucleation and propagation of vortices accompanied by more complex domain structures.

Citation

Journal of Applied Physics

Volume

85

Issue

No. 8

Pub Type

Journals

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Keywords

coercivities, magnetization, magnetostatic field, micromagnetic

Citation

McMichael, R. , Donahue, M. , Porter, D. and Eicke, J. (1999), Comparison of Magnetostatic Field Calculation Methods on Two Dimensional Square Grids as Applied to Micromagnetic Standard Problem, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853547 (Accessed May 12, 2026)

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