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

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2012

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Brandt, Rebekah
Fassbender, Jürgen
Rohrmann, Hartmut
Albrecht, Manfred
Schmidt, Holger

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https://doi.org/10.1063/1.4745906
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Journal of Applied Physics. American Institute of Physics (AIP). 2012, 112(3), 033918. ISSN 0021-8979. eISSN 1089-7550. Available under: doi: 10.1063/1.4745906

Zusammenfassung

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.

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ISO 690BRANDT, Rebekah, Stefan TIBUS, Felix SPRINGER, Jürgen FASSBENDER, Hartmut ROHRMANN, Manfred ALBRECHT, Holger SCHMIDT, 2012. Influence of intergranular exchange coupling on the magnetization dynamics of CoCrPt:SiO2 granular media. In: Journal of Applied Physics. American Institute of Physics (AIP). 2012, 112(3), 033918. ISSN 0021-8979. eISSN 1089-7550. Available under: doi: 10.1063/1.4745906
BibTex
@article{Brandt2012-08Influ-49386,
  year={2012},
  doi={10.1063/1.4745906},
  title={Influence of intergranular exchange coupling on the magnetization dynamics of CoCrPt:SiO<sub>2</sub> granular media},
  number={3},
  volume={112},
  issn={0021-8979},
  journal={Journal of Applied Physics},
  author={Brandt, Rebekah and Tibus, Stefan and Springer, Felix and Fassbender, Jürgen and Rohrmann, Hartmut and Albrecht, Manfred and Schmidt, Holger},
  note={Article Number: 033918}
}
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