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Finite-Temperature Micromagnetism

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4 Author(s)
Ralph Skomski$^{1}$ Department of Physics and Astronomy and NCMN,, University of Nebraska,, Lincoln,, NE , USA ; Pankaj Kumar ; George C. Hadjipanayis ; D. J. Sellmyer

It is investigated how magnetic hysteresis is affected by finite-temperature excitations, using soft regions in hard-magnetic matrices as model systems. In lowest order, magnetization processes are described by the traditional approach of using finite-temperature materials constants such as K1 (T). Nanoscale excitations are usually small perturbations. For example, a Bloch summation over all magnon wave vectors shows that remanence is slightly enhanced, because long-wavelength excitations are suppressed. However, a reverse magnetic field enhances the effect of thermal excitations and causes a small reduction of the coercivity. To describe such effects, we advocate micromagnetic calculations where finite-temperature fluctuations are treated as small corrections to the traditional approach, as contrasted to full-scale Monte Carlo simulations.

Published in:

IEEE Transactions on Magnetics  (Volume:49 ,  Issue: 7 )