Activation entropy, activation energy, and magnetic viscosity

R. Skomski; R. D. Kirby; D. J. Sellmyer

doi:10.1063/1.370093

Activation entropy, activation energy, and magnetic viscosity

R. Skomski, R. D. Kirby, D. J. Sellmyer

Physics and Astronomy

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Abstract

Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers' escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are found.

Original language	English (US)
Pages (from-to)	5069-5071
Number of pages	3
Journal	Journal of Applied Physics
Volume	85
Issue number	8 II A
DOIs	https://doi.org/10.1063/1.370093
State	Published - Apr 15 1999
Event	Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States Duration: Nov 9 1998 → Nov 12 1998

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General Physics and Astronomy

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10.1063/1.370093

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abstract = "Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers' escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are found.",

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AU - Skomski, R.

AU - Kirby, R. D.

AU - Sellmyer, D. J.

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N2 - Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers' escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are found.

AB - Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers' escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are found.

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SN - 0021-8979

VL - 85

SP - 5069

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 8 II A

T2 - Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials

Y2 - 9 November 1998 through 12 November 1998

ER -

Activation entropy, activation energy, and magnetic viscosity

Abstract

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