Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-05
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, two-column, 8 figures
Scientific paper
The energetics of thin elongated ferromagnetic nano-islands is considered for some different shapes, aspect ratios, and applied magnetic field directions. These nano-island particles are important for artificial spin-ice materials. For low temperature, the magnetic internal energy of an individual particle is evaluated numerically as a function of the direction of a particle's net magnetization. This leads to estimations of effective anisotropy constants for (1) the easy axis along the particle's long direction, and (2) the hard axis along the particle's thin direction. A spin relaxation algorithm together with fast Fourier transform for the demagnetization field is used to solve the micromagnetics problem for a thin system. The magnetic hysteresis is also found. The results indicate some possibilities for controlling the equilibrium and dynamics in spin-ice materials by using different island geometries.
Mol Lucas A. S.
Moura-Melo Winder A.
Pereira Afranio Rodrigues
Wysin Gary M.
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