Abstract
This report is on a new class of magnetostatically tunable magneto-impedance and magneto-capacitance devices based on a composite of ferromagnetic Metglas and ferroelectric lead zirconate titanate (PZT). Layered magneto-electric (ME) composites with annealed Metglas and PZT were studied in a longitudinal in-plane magnetic field-transverse electric field (L-T) mode. It was found that the degree of tunability was dependent on the annealing temperature of Metglas. An impedance tunability (ΔZ/Z0) of ≥400% was obtained at the electromechanical resonance (EMR) frequency (fr) for a sample with Metglas layers annealed at Ta = 500oC. This tunability is a factor of two higher than for composites with Metglas annealed at 350oC. The tunability of the capacitance, (ΔC/C0), was found to be 290% and -135k% at resonance and antiresonance, respectively, for Ta = 500oC. These results provide clear evidence for improvement in static magnetic field tunability of impedance and capacitance of ME composites with the use of annealed Metglas and are of importance for their potential use in tunable electronic applications.
Highlights
The past two decades have seen booming research in magnetoelectric (ME) materials and a vigorous expansion of efforts to develop controllable ME effects for various electrical applications
For ME composites with Metglas layers annealed at 350 oC, there was little change in the spectra with changes in HBias between -10 Oe and 10 Oe, in addition, the small shifts that were observed were similar between positive and negative HBias applied along the length direction of Metglas
We found the spectra for ME composites with a 500 oC annealed Metglas layer when operated at -10 Oe in a forward HBias sweep overlapped with corresponding spectra operated at 10 Oe in backward HBias sweep; both the Z and C curves
Summary
The past two decades have seen booming research in magnetoelectric (ME) materials and a vigorous expansion of efforts to develop controllable ME effects for various electrical applications. Pb(Zr, Ti)O3 (PZT) bar and a MnZn ferrite ring.[13] Later, Lou et al suggested a multiferroic composite consisting of a PZT ceramic layer and two Metglas foils that exhibited an inductance change up to 450%.14. Both of these experiments were based on E-field tuning. An asymmetry in the capacitance tunability effect was observed under low magnetic field bias (HBias) for ME composites with Metglas layers having annealing temperature higher than 450oC
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