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Axial And Off-Axial Dynamic Transitions In Uniaxially Anisotropic Heisenberg Ferromagnet: A Comparison

Author

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  • MUKTISH ACHARYYA

    (Department of Physics, Krishnanagar Government College, P.O.-Krishnanagar, Dist.- Nadia, West-Bengal, PIN-741101, India)

Abstract

Uniaxially anisotropic Heisenberg ferromagnet, in the presence of a magnetic field varying sinusoidally in time, is studied by Monte Carlo simulation. The axial (field applied only along the direction of anisotropy) and off-axial (field applied only along the direction which is perpendicular to the direction of anisotropy) dynamic transitions are studied. By studying the distribution of the dynamic order parameter component, it is observed that the axial transition is discontinuous for low anisotropy and becomes continuous in high anisotropy. The off-axial transition is found to be continuous for all values of anisotropy. In the infinite anisotropy limit, both types of transitions are compared with that observed in an Ising ferromagnet for the same value of the field and frequency. The infinitely anisotropic axial transition and dynamic transition in the Ising ferromagnet occur at different temperatures, whereas the infinitely anisotropic off-axial transition and the equilibrium ferro-para transition in the Ising model occur at the same temperature.

Suggested Citation

  • Muktish Acharyya, 2003. "Axial And Off-Axial Dynamic Transitions In Uniaxially Anisotropic Heisenberg Ferromagnet: A Comparison," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 14(01), pages 49-59.
    • Handle: RePEc:wsi:ijmpcx:v:14:y:2003:i:01:n:s0129183103004206
    DOI: 10.1142/S0129183103004206
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