Attenuation of 618 MHz SAW in multilayer Ni-Cu-Ni thin films
| Autor: | M. Levy, R.F. Wiegert |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | IEEE 1988 Ultrasonics Symposium Proceedings.. |
| DOI: | 10.1109/ultsym.1988.49390 |
| Popis: | The authors report on the magnetic field (H) dependence of attenuation alpha (H) of 618-MHz SAW (surface acoustic waves) propagating in vacuum-evaporated multilayer Ni-Cu-Ni thin-film samples. Experimental results indicate that the magnetoelastic alpha (H) response of approximately=200-AA single layers of Ni ( alpha (H) approximately=22 dB/cm) is not affected by the deposition of overlayers of 75 AA and 180 AA of Cu; however, the deposition of a second approximately=200-AA layer of Ni onto the Ni-Cu structure reduces the alpha (H) response of the resultant Ni-Cu-Ni composite sample by over two orders of magnitude (from 22 dB/cm to approximately=1 dB/cm). Interpretation of these results in terms of a theoretical model for SAW attenuation in magnetostrictive thin films indicates that mutual magnetostatic coupling between the two Ni layers of the Ni-Cu-Ni composite films may be effectively self biasing the samples into a magnetically saturated low- alpha (H)-response operating regime. It is concluded that if multilayer magnetic-film-nonmagnetic-film structures are to be used in magnetically controllable SAW devices it appears that the effective magnetostatic coupling between the magnetic layers should be reduced. > |
| Databáze: | OpenAIRE |
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