Temperature Hysteresis in the Dynamic Spin-Fluctuation Theory for Strong Ferromagnets

B.I. Reser; Vladimir I. Grebennikov; N.B. Melnikov

doi:10.4028/www.scientific.net/SSP.152-153.579

Paper Titles

Conditions for the Spin-Spiral State in Itinerant Magnets
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A Fluctuating Field Theory for Systems of Localized Magnetic Moments
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Impurity Assisted Interlayer Exchange Coupling in Iron/Silicon Multilayers
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Investigation of the Critical Properties in the 3D Site-Diluted Potts Model
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Investigation of the 3D ANNNI Model by Monte Carlo Methods
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Temperature Hysteresis in the Dynamic Spin-Fluctuation Theory for Strong Ferromagnets
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Charge and Spin Pairing Instabilities in Hubbard Nanoclusters
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Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium
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Application of the Mean-Field Approximation to the Magnetic and Superconducting Phases of Quasi-One-Dimensional Metal
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Temperature Hysteresis in the Dynamic Spin-Fluctuation Theory for Strong Ferromagnets

Abstract:

Temperature dependence of magnetic characteristics of Fe and Fe-Ni invar is considered in the dynamic nonlocal approximation of the spin-fluctuation theory. Numerical calculations show that the magnetic characteristics can have a discontinuous jump at high temperatures, well below the Curie temperature. Using methods of the catastrophe theory, we investigate the effect of small changes in the initial data on the results of the calculation. It is demonstrated that the discontinuous jump can only be smoothed but cannot be eliminated entirely without a significant change in the system of equations of the spin-fluctuation theory. Possible variants of such changes are discussed.