Abstract
The magneto-electric coupling and magneto-capacitance effect of a layer composite ferromagnet/ piezoelectric/ferromagnet was investigated. Several resonant peaks were observed on the curves of the capacitance versus frequency. The resonant peaks were found to shift under an applied magnetic field, and the impedance of the sample can be changed from capacitive to inductive ones with changing the field. Thus, giant negative and positive magneto-capacitance effects can be observed simultaneously under a magnetic field less than 1 k Oe near the resonant points. Experimental and theoretical analysis showed that such magnetically tuned variation in impedance originates from the magnetic field-induced change of the compliances of the magnetic phase of the composite.
Highlights
The magnetic field-induced change of capacitance, which is known as magneto-capacitance (MC) effects, is currently attracting much interest of study for new applications in microwave field, magnetic detection in broad band of frequency and electronic devices, such as magnetic sensors, tunable spin filter, storage devices, etc
The resonant peaks were found to shift under an applied magnetic field, and the impedance of the sample can be changed from capacitive to inductive ones with changing the field
Since Suchtelen suggested magnetoelectric effects in composites, extensive studies have been performed on MC effect in the magnetoelectric composites [9]
Summary
The magnetic field-induced change of capacitance, which is known as magneto-capacitance (MC) effects, is currently attracting much interest of study for new applications in microwave field, magnetic detection in broad band of frequency and electronic devices, such as magnetic sensors, tunable spin filter, storage devices, etc. The resonant peaks were found to shift under an applied magnetic field, and the impedance of the sample can be changed from capacitive to inductive ones with changing the field. There was report to point out that the resonance frequency of the layered magnetostrictive/piezoelectric composites can be tuned by external magnetic field [10,11,12,13].
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