Direct measurement of permeability up to 3 GHz of Co‐based alloys under tensile stress
| Autor: | J. Kazandjoglou, Olivier Acher, J. L. Vermeulen, P. Baclet, A. Lucas, J.C. Peuzin |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 73:6162-6164 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | The high frequency permeability of CoNbZr and CoZrMoNi prepared by magnetron sputtering, and of CoFeSiB deposited by ion beam sputtering was investigated. The layers were deposited on thin (8–12 μm) mylar films, and it was therefore possible to induce large tensile stress with moderate force. The permeability of the layers was measured along the stress direction, in a frequency range that allowed the observation of the rotational permeability and the gyromagnetic resonance. The resonance frequency of CoNbZr shifted from 1.4 to over 3 GHz under stress. A simple model assuming that the easy axis is constant over the whole film predicts the evolution of resonance frequency and initial permeability. This model is in good agreement with measurements on CoZrMoNi, and yields a satisfactory estimation of the magnetostriction coefficient. In the case of CoNbZr, a poorer agreement is attributed to the dispersion of local magnetization direction. For very large stress, cracks in the ferromagnetic films are expected ... |
| Databáze: | OpenAIRE |
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