Neutron diffraction and ferromagnetic resonance studies on plasma-sprayed MnZn ferrite films
The magnetic properties of MnZn ferrites are affected by the plasma spray process. It is found that improvements can be made by annealing the ferrite films at 500 °C–800 °C. The annealing induced magnetic property changes are studied by neutron diffraction and ferromagnetic resonance techni...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/95499 http://hdl.handle.net/10220/8963 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The magnetic properties of MnZn ferrites are affected by the plasma spray process. It is found that
improvements can be made by annealing the ferrite films at 500 °C–800 °C. The annealing induced
magnetic property changes are studied by neutron diffraction and ferromagnetic resonance
techniques. The increase of the saturation magnetization is attributed to the cation ordering within
the spinel lattice, which increases the magnetic moment per ferrite formula. The refinements on the
neutron diffraction data suggest that the redistribution of the cation during annealing neither starts
from a fully disordered state nor ends to a fully ordered state. The decrease of the coercivity is
analyzed with the domain wall pinning model. The measurements on the magnetostriction and
residual stress indicate that coercive mechanisms arising from the magnetoelastic energy term are
not dominant in these ferrite films. The decrease of the coercivity for annealed ferrite films is mainly
attributed to the decrease of the effective anisotropic field, which may result from the
homogenization of the film composition and the reduction of the microstructural discontinuity (e.g.,
cracks, voids, and splat boundaries). |
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