Magnetization dynamics of soft nanocrystalline thin films with random magnetocrystalline anisotropy and induced uniaxial anisotropy
Results of frequency-dependent ferromagnetic resonance (FMR) measurements are presented for thin Fe-Zr-N nanocrystalline films with random magnetocrystalline anisotropy and induced uniaxial anisotropy. The study is done by changing the composition, the grain size and the magnitude of the induced ani...
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| Veröffentlicht in: | Journal of physics. Condensed matter 2004-12, Vol.16 (50), p.9227-9241 |
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| container_title | Journal of physics. Condensed matter |
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| creator | Craus, C B Chezan, A R Boerma, D O Niesen, L |
| description | Results of frequency-dependent ferromagnetic resonance (FMR) measurements are presented for thin Fe-Zr-N nanocrystalline films with random magnetocrystalline anisotropy and induced uniaxial anisotropy. The study is done by changing the composition, the grain size and the magnitude of the induced anisotropy. We show that the magnetization dynamics is strongly influenced by the structural parameters of our samples. Although the frequency-dependent spectra can be analysed on the basis of the Landau-Lifshitz equation, an extra field Hshift has to be introduced in order to have agreement between the experiment and calculations. This extra field does not depend on the saturation magnetization and increases significantly when the grain size decreases from 10 to 2 nm. In addition, we observe a nonlinear decrease of the frequency linewidth with the applied dc field. After discussing various existing models we conclude that Hshift originates from variations in the magnitudeof the magnetization, related with the nanocrystalline structure. |
| doi_str_mv | 10.1088/0953-8984/16/50/013 |
| format | Article |
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The study is done by changing the composition, the grain size and the magnitude of the induced anisotropy. We show that the magnetization dynamics is strongly influenced by the structural parameters of our samples. Although the frequency-dependent spectra can be analysed on the basis of the Landau-Lifshitz equation, an extra field Hshift has to be introduced in order to have agreement between the experiment and calculations. This extra field does not depend on the saturation magnetization and increases significantly when the grain size decreases from 10 to 2 nm. In addition, we observe a nonlinear decrease of the frequency linewidth with the applied dc field. 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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances spin-wave resonance Magnetic properties and materials Magnetic resonances and relaxations in condensed matter, mössbauer effect Physics Studies of specific magnetic materials |
| title | Magnetization dynamics of soft nanocrystalline thin films with random magnetocrystalline anisotropy and induced uniaxial anisotropy |
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