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2002•IEEE Transactions on MagneticsRequires access

Zero-field viscosity in perpendicular media

S. Wang, Tong Zhao, J. W. Harrell

Open publisher page 4 citations

Abstract

The thermal relaxation of the magnetization has been measured in zero applied field as a function of the remanent magnetization in a CoPtCrB thin film with perpendicular magnetization. The remanent magnetization was obtained by partial dc demagnetization by applying a saturation-reverse-zero-field sequence. The initial viscosity was found to be strongly dependent on the initial remanence and the demagnetization field. The initial viscosity was calculated using a mean-field Arrhenius-Neel model giving good agreement with the experimental data.

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What this paper is about

The thermal relaxation of the magnetization has been measured in zero applied field as a function of the remanent magnetization in a CoPtCrB thin film with perpendicular magnetization. The remanent magnetization was obtained by partial dc demagnetization by applying a saturation-reverse-zero-field sequence. The initial viscosity was found to be strongly dependent on the initial remanence and the demagnetization field. The initial viscosity was calculated using a mean-field Arrhenius-Neel model giving good agreement with the experimental data.

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Available abstract

The thermal relaxation of the magnetization has been measured in zero applied field as a function of the remanent magnetization in a CoPtCrB thin film with perpendicular magnetization. The remanent magnetization was obtained by partial dc demagnetization by applying a saturation-reverse-zero-field sequence. The initial viscosity was found to be strongly dependent on the initial remanence and the demagnetization field. The initial viscosity was calculated using a mean-field Arrhenius-Neel model giving good agreement with the experimental data.

Key concepts: Remanence, Demagnetizing field, Condensed matter physics, Magnetization, Stoner–Wohlfarth model, Materials science, Saturation (graph theory), Single domain

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