Physics – Condensed Matter
Scientific paper
1995-08-09
J. Appl. Phys., 79 (1996) 5749-5751
Physics
Condensed Matter
3 pages, REVTeX, 3 figures. Submitted to Proceedings of the 40th Annual Magnetism and Magnetic Materials Conference
Scientific paper
10.1063/1.362175
Recently experimental techniques, such as magnetic force microscopy (MFM), have enabled the magnetic state of individual sub-micron particles to be resolved. Motivated by these experimental developments, we use Monte Carlo simulations of two-dimensional kinetic Ising ferromagnets to study the magnetic relaxation in a negative applied field of a grain with an initial magnetization $m_0 = +1$. The magnetostatic dipole-dipole interactions are treated to lowest order by adding to the Hamiltonian a term proportional to the square of the magnetization. We use droplet theory to predict the functional forms for some quantities observed by MFM, such as the probability that the magnetization is positive. Our simulations are in excellent agreement with droplet-theoretical predictions. The qualitative agreement between experiments and our simulations of switching in individual single-domain ferromagnets indicates that the switching mechanism in such particles may involve local nucleation and subsequent growth of droplets of the stable phase.
Novotny Mark A.
Richards Howard L.
Rikvold Per Arne
Sides Scott W.
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