A comprehensive analysis of magnetoimpedance phenomena in Finemet-type as spun ribbons with a Cu–Co layer electrodeposited at different currents is presented here as a function of microstructure. The measurements were performed in moderate and high frequencies (30 kHz–6 GHz) under an axial magnetic field, up to 25 kA/m. The magnetoimpedance variations have been studied by measuring the reflection parameter S11 of a coaxial line containing the magnetic sample by means of a vector network analyzer. The GMI vs applied field curve does not show a monotonic decay but displays a maximum. GMI first increases with frequencies up to ∼10 MHz reaching values of ΔZ/Zmax ∼ 20%. At higher frequencies the GMI ratio is seen to decrease becoming vanishingly small at ∼1 GHz.
High-frequency magnetoimpedance properties in Finemet-type ribbons with a Cu-Co electrodeposited layer / JOSEFINA M., Silveyra; Coisson, Marco; Federica, Celegato; Tiberto, PAOLA MARIA; Vinai, Franco; JAVIER A., Moya; VICTORIA J., Cremaschi. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 495:2(2010), pp. 412-416. [10.1016/j.jallcom.2009.10.173]
High-frequency magnetoimpedance properties in Finemet-type ribbons with a Cu-Co electrodeposited layer
COISSON, MARCO;FEDERICA CELEGATO;TIBERTO, PAOLA MARIA;VINAI, FRANCO;
2010
Abstract
A comprehensive analysis of magnetoimpedance phenomena in Finemet-type as spun ribbons with a Cu–Co layer electrodeposited at different currents is presented here as a function of microstructure. The measurements were performed in moderate and high frequencies (30 kHz–6 GHz) under an axial magnetic field, up to 25 kA/m. The magnetoimpedance variations have been studied by measuring the reflection parameter S11 of a coaxial line containing the magnetic sample by means of a vector network analyzer. The GMI vs applied field curve does not show a monotonic decay but displays a maximum. GMI first increases with frequencies up to ∼10 MHz reaching values of ΔZ/Zmax ∼ 20%. At higher frequencies the GMI ratio is seen to decrease becoming vanishingly small at ∼1 GHz.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
