Colossal magnetodielectric effect caused by magnetoelectric effect under low magnetic field

Abstract

The colossal magnetodielectric effect is reported in Pb(Zr,Ti)O 3 /Terfenol-D laminate composite under low magnetic field. When the composite is placed in an external a.c. magnetic field, magnetoelectric effect is produced, as a result, the dielectric properties of the Pb(Zr,Ti)O 3 is changed, i.e. magnetodielectric effect. Both the amplitude and resonance frequency change with the external magnetic field. The colossal magnetodielectric coefficient of 5 × 10 4 % at low magnetic field of 20 Oe is achieved near the electromechanical resonance frequency.

Sensitivity and Noise Evaluation of a Bonded Magneto(elasto) Electric Laminated Sensor Based on In-Plane Magnetocapacitance Effect for Quasi-Static Magnetic Field Sensing

“…Under an electric field excitation, especially at the PE resonance, the ME laminate can serve as a magnetocapacitance magnetic field sensor. This effect is based on the parametric modulation of the electric permittivity by a low-frequency magnetic-field-induced stress [14]. The magnetic-field-sensing capacitance of an ME laminate reaches its maximum around the PE resonant frequency, where the efficient dielectric coefficient is most sensitive to a low-frequency external stress [15].…”

Mechanical Noise Limit of a Strain-Coupled Magneto(Elasto)electric Sensor Operating Under a Magnetic or an Electric Field Modulation

“…Finally, the magnetodielectric (or magneto-capacitance) described as a change in the dielectric constant as a function of an applied magnetic field can also be used for field sensing. In this E/E detection mode, low frequency magnetic fields can be measured from the change of the sensor capacitance at a given excitation frequency which is controlled by the low frequency reference magnetic field [10], [11], [12]. Fig.…”

The magnetodielectric effect in BaTiO3–SrFe12O19nanocomposites

“…19 A widely used method for examining the indirect ME coupling is based on dielectric spectroscopy studies in the presence of external magnetic elds. 20,21 A change in dielectric permittivity with eld indicates the so-called MD effect. In this study we report dielectric properties obtained on a nanoscale composite of magnetic strontium hexaferrite, SrFe 12 O 19 (SFO), embedded in a matrix with a high dielectric permittivity, BaTiO 3 (BTO).…”