Influence of intergranular exchange coupling on the magnetization dynamics of CoCrPt:SiO2 granular media

We investigate the effect of Co+ irradiation on the magnetization dynamics of CoCrPt:SiO2 granular media. Increasing irradiation levels reduce the saturation magnetization and effective anisotropy, which decrease the intrinsic magnetization precession frequency. Furthermore, increasing intergranular...

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Veröffentlicht in:	Journal of applied physics 2012-08, Vol.112 (3)
Hauptverfasser:	Brandt, R., Tibus, S., Springer, F., Fassbender, J., Rohrmann, H., Albrecht, M., Schmidt, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	Anisotropy Dynamic tests Dynamics Irradiation Joining Magnetization Media Saturation (magnetic)
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creator	Brandt, R. Tibus, S. Springer, F. Fassbender, J. Rohrmann, H. Albrecht, M. Schmidt, H.
description	We investigate the effect of Co+ irradiation on the magnetization dynamics of CoCrPt:SiO2 granular media. Increasing irradiation levels reduce the saturation magnetization and effective anisotropy, which decrease the intrinsic magnetization precession frequency. Furthermore, increasing intergranular exchange coupling results in a qualitative change in the behavior of the magnetic material from a collection of individual grains to a homogeneous thin film, as evidenced in both the switching behavior and dynamics. The frequency change cannot be explained by single crystal macrospin modeling, and can only be reproduced by the inclusion of the dipolar effects and anisotropy distribution inherent in a granular medium.
doi_str_mv	10.1063/1.4745906
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Increasing irradiation levels reduce the saturation magnetization and effective anisotropy, which decrease the intrinsic magnetization precession frequency. Furthermore, increasing intergranular exchange coupling results in a qualitative change in the behavior of the magnetic material from a collection of individual grains to a homogeneous thin film, as evidenced in both the switching behavior and dynamics. 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Increasing irradiation levels reduce the saturation magnetization and effective anisotropy, which decrease the intrinsic magnetization precession frequency. Furthermore, increasing intergranular exchange coupling results in a qualitative change in the behavior of the magnetic material from a collection of individual grains to a homogeneous thin film, as evidenced in both the switching behavior and dynamics. The frequency change cannot be explained by single crystal macrospin modeling, and can only be reproduced by the inclusion of the dipolar effects and anisotropy distribution inherent in a granular medium.</abstract><doi>10.1063/1.4745906</doi></addata></record>
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subjects	Anisotropy Dynamic tests Dynamics Irradiation Joining Magnetization Media Saturation (magnetic)
title	Influence of intergranular exchange coupling on the magnetization dynamics of CoCrPt:SiO2 granular media
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