Thermal investigations of the acoustic emission in polycrystalline ferrimagnets

Acoustic emission (AE) has been studied along hysteresis loops from 77 K up to the Curie temperature T/sub c/ on a YIG and on a Ni-Zn ferrite. It is found that the AE activity is proportional to the hysteresis losses, which confirms previous measurements at room temperature on a larger set of materi...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 26; no. 5; pp. 1828 - 1830
Main Authors Guyot, M., Merceron, T., Renaudin, P., Cagan, V.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.09.1990
Institute of Electrical and Electronics Engineers
Subjects
Acoustic emission
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Demagnetization
Exact sciences and technology
Ferrimagnetic materials
Grain size
Hysteresis
Insulation
Magnetic materials
Magnetic properties and materials
Magnetostriction
Physics
Shape
Temperature measurement
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Summary:Acoustic emission (AE) has been studied along hysteresis loops from 77 K up to the Curie temperature T/sub c/ on a YIG and on a Ni-Zn ferrite. It is found that the AE activity is proportional to the hysteresis losses, which confirms previous measurements at room temperature on a larger set of materials, and which reinforces the idea that domain wall creation/annihilation is the origin of both AE and hysteresis losses. The temperature dependence of the AE is interpreted in terms of a frequency shift of the AE spectrum and of self-absorption/dispersion of the AE by the domain walls and/or by the diffusion centers.< >
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ISSN:0018-9464
1941-0069
DOI:10.1109/20.104539