| نویسندگان | جمیل پناه-محمدرضا حاجی علی-محسنی-عرفانی فام-سید مجید محسنی-هوشیار-احسان روزمه |
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| نشریه | J PHYS D APPL PHYS |
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| تاریخ انتشار | ۲۰۱۷-۳-۰۱ |
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| نوع نشریه | الکترونیکی |
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| نمایه نشریه | ISI |
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چکیده مقاله
Abstract
A systematic study of the effect of the deposition of cobalt (Co) and nickel (Ni) layers
of various thicknesses on the magnetoimpedance (MI) response of a soft ferromagnetic
amorphous ribbon (Co
68.15
Fe
4.35
Si
12.5
B
15
) is performed. The Co and Ni layers with
thicknesses of 5, 10, 20 and 40
nm were grown on both sides of the amorphous ribbons
by the electrodeposition technique. Microstrutures determined by x-ray diffraction (XRD)
and field emission scanning electron microscopy (FESEM) showed higher crystallinity of
Ni-deposited layers and the amorphous ferromagnetic nature of Co-deposited. The vibrating
sample magnetometry (VSM) does not represent significant changes between samples because
of the small contribution of such a thin layer deposited on thick ribbons, but the MI response
dictates that the magnetic coupling effect occurred at the interface of such bilayers, which is
sensitive to the skin effect. The MI response of Co-deposited ribbons showed MI hysteretic
behavior depending on the deposited layer thicknesses with an optimum response for the
thickness of 20
nm whereas no hysteretic behavior was measured for Ni-deposited ribbons.
This behavior is explained according to the exchange coupling between magnetization of
electrodeposited layers and magnetic ribbons with respect to different magnetic properties
of Co and Ni at different thicknesses. Also the MI response of Ni- and Co-deposited ribbons
enhanced significantly at low thicknesses relative to bare ribbon. By increasing the thickness
of deposited layers, MI response decreases considerably. Differences in MI ratios of Co- and
Ni-deposited ribbons are explained according to exchange length, crystallinity and roughness
of deposited layers. Our results could address a simple way to achieve a higher MI response,
and explains physical aspects of exchange coupling in MI response all towards a better
performance of magnetic field sensors