scholarly journals Converse Magnetoelectric Composite Resonator for Sensing Small Magnetic Fields

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
P. Hayes ◽  
M. Jovičević Klug ◽  
S. Toxværd ◽  
P. Durdaut ◽  
V. Schell ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Fields ◽  
Limit Of Detection ◽  
Low Frequency ◽  
Bias Field ◽  
Pickup Coil ◽  
Magnetic Bias ◽  
Mechanical Coupling ◽  
Magnetic Bias Field ◽  
Mechanical Resonances

Abstract Magnetoelectric (ME) thin film composites consisting of sputtered piezoelectric (PE) and magnetostrictive (MS) layers enable for measurements of magnetic fields passively, i.e. an AC magnetic field directly generates an ME voltage by mechanical coupling of the MS deformation to the PE phase. In order to achieve high field sensitivities a magnetic bias field is necessary to operate at the maximum piezomagnetic coefficient of the MS phase, harnessing mechanical resonances further enhances this direct ME effect size. Despite being able to detect very small AC field amplitudes, exploiting mechanical resonances directly, implies a limitation to available signal bandwidth along with the inherent inability to detect DC or very low frequency magnetic fields. The presented work demonstrates converse ME modulation of thin film Si cantilever composites of mesoscopic dimensions (25 mm × 2.45 mm × 0.35 mm), employing piezoelectric AlN and magnetostrictive FeCoSiB films of 2 µm thickness each. A high frequency mechanical resonance at about 515 kHz leads to strong induced voltages in a surrounding pickup coil with matched self-resonance, leading to field sensitivities up to 64 kV/T. A DC limit of detection of 210 pT/Hz1/2 as well as about 70 pT/Hz1/2 at 10 Hz, without the need for a magnetic bias field, pave the way towards biomagnetic applications.

scholarly journals Mechanical-Resonance-Enhanced Thin-Film Magnetoelectric Heterostructures for Magnetometers, Mechanical Antennas, Tunable RF Inductors, and Filters

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2259 ◽  
Author(s):  
Cheng Tu ◽  
Zhao-Qiang Chu ◽  
Benjamin Spetzler ◽  
Patrick Hayes ◽  
Cun-Zheng Dong ◽  
...  
Keyword(s):  
Thin Film ◽  
Limit Of Detection ◽  
Rapid Development ◽  
Low Frequency ◽  
Complementary Metal Oxide Semiconductor ◽  
Cmos Technology ◽  
Medical Diagnostics ◽  
Oxide Semiconductor ◽  
Great Promise ◽  
Tunable Inductors

The strong strain-mediated magnetoelectric (ME) coupling found in thin-film ME heterostructures has attracted an ever-increasing interest and enables realization of a great number of integrated multiferroic devices, such as magnetometers, mechanical antennas, RF tunable inductors and filters. This paper first reviews the thin-film characterization techniques for both piezoelectric and magnetostrictive thin films, which are crucial in determining the strength of the ME coupling. After that, the most recent progress on various integrated multiferroic devices based on thin-film ME heterostructures are presented. In particular, rapid development of thin-film ME magnetometers has been seen over the past few years. These ultra-sensitive magnetometers exhibit extremely low limit of detection (sub-pT/Hz1/2) for low-frequency AC magnetic fields, making them potential candidates for applications of medical diagnostics. Other devices reviewed in this paper include acoustically actuated nanomechanical ME antennas with miniaturized size by 1–2 orders compared to the conventional antenna; integrated RF tunable inductors with a wide operation frequency range; integrated RF tunable bandpass filter with dual H- and E-field tunability. All these integrated multiferroic devices are compact, lightweight, power-efficient, and potentially integrable with current complementary metal oxide semiconductor (CMOS) technology, showing great promise for applications in future biomedical, wireless communication, and reconfigurable electronic systems.

Giant Converse Magnetoelectric Effect in PZT/FeCuNbSiB/FeGa/FeCuNbSiB/PZT Laminates Without Magnetic Bias Field

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Chao Yang ◽  
Ping Li ◽  
Yumei Wen ◽  
Aichao Yang ◽  
Decai Wang ◽  
...  
Keyword(s):  
Magnetoelectric Effect ◽  
Bias Field ◽  
Magnetic Bias ◽  
Magnetic Bias Field

scholarly journals Piezomagnetic Dependences on Magnetic Bias Field of Annealed at 450°C Fe-Cu-Nb-Si-B Alloy

1997 ◽  
Vol 91 (2) ◽  
pp. 487-490 ◽  
Author(s):  
Z. Kaczkowski ◽  
E. Milewska ◽  
P. Duhaj ◽  
G. Vlasák
Keyword(s):  
Bias Field ◽  
Magnetic Bias ◽  
Magnetic Bias Field

Electric field control of magnetism without magnetic bias field in the Ni/Pb(Mg1/3Nb2/3)O3-PbTiO3/Ni composite

2011 ◽  
Vol 99 (3) ◽  
pp. 032509 ◽  
Author(s):  
H. C. Xuan ◽  
L. Y. Wang ◽  
Y. X. Zheng ◽  
Y. L. Li ◽  
Q. Q. Cao ◽  
...  
Keyword(s):  
Electric Field ◽  
Bias Field ◽  
Magnetic Bias ◽  
Magnetic Bias Field ◽  
Field Control

MAGNETIC BIAS FIELD DEPENDENCE OF THE MAGNETOELECTRIC EFFECT IN A MAGNETOELECTRIC STRUCTURE: A SIMPLE MODEL

2004 ◽  
Vol 18 (18) ◽  
pp. 963-969 ◽  
Author(s):  
Y. P. WAN ◽  
Z. ZHONG
Keyword(s):  
Theoretical Model ◽  
Simple Model ◽  
Field Dependence ◽  
Composite Structure ◽  
Magnetoelectric Effect ◽  
Bias Field ◽  
Quantitative Relation ◽  
Magnetic Bias ◽  
Magnetic Bias Field ◽  
Nonlinear Constitutive Relation

The magnetoelectric (ME) effect in a ME composite structure in which a magnetostrictive component is bonded with a piezoelectric component was studied theoretically, based on the hyperbolic nonlinear constitutive relation of magnetostriction and the piezoelectric equations. A quantitative relation was established analytically for the ME effect and the influencing factors, such as the magnetic bias field and the structure dimensions. It was verified that the theoretical model agrees qualitatively with the experimental results published in Ref. 7. It can also be predicted by the model that the ME effect can be improved by optimizing the structure dimensions.

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