Magnetoimpedance of NiFe/Ag multilayers in the 100 kHz–1.8 GHz range

Magnetoimpedance of NiFe/Ag multilayers in the 100 kHz–1.8 GHz range

Magnetoimpedance curves at frequencies up to 1.8 GHz for (Ni 81Fe 19/Ag) n multilayers with n=15, 50 and 100, and thickness ratio t Py/ t Ag: 100 7 , 100 25 , 100 100 , 200 14 , 200 50 and 200 200 A ̊ are presented. Evidences of FMR are observed in most samples studied. Samples with 15, 50 and 100 b...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2004-05, Vol.272, p.1846-1847
Hauptverfasser: de Andrade, A.M.H., da Silva, R.B., Correa, M.A., Viegas, A.D.C., Severino, A.M., Sommer, R.L.
Format: Artikel
Sprache:eng
Schlagworte:
High frequency
Magnetoimpedance
Multilayers
Permalloy
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Zusammenfassung:Magnetoimpedance curves at frequencies up to 1.8 GHz for (Ni 81Fe 19/Ag) n multilayers with n=15, 50 and 100, and thickness ratio t Py/ t Ag: 100 7 , 100 25 , 100 100 , 200 14 , 200 50 and 200 200 A ̊ are presented. Evidences of FMR are observed in most samples studied. Samples with 15, 50 and 100 bilayers exhibited a maximum MI ratio of about 100%, 175% and 250%, respectively. For samples with t Py=4t Ag, peculiar impedance spectra with 4 peaks were observed.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.12.826