The magnetic field response results on a five-layer structure given as Metglas/Terfenol-D/ Pb（Zr,Ti）O3frerfenol-D/Metglas were reported. Due to its high permeability, Metglas can be incorporated as the third phase i...The magnetic field response results on a five-layer structure given as Metglas/Terfenol-D/ Pb（Zr,Ti）O3frerfenol-D/Metglas were reported. Due to its high permeability, Metglas can be incorporated as the third phase into conventional Pb（Zr, Ti）OJTerfenol-D laminates, which results in a stronger magnetoelectric（ME） response. The increase in Metglas thickness significantly influences the ME response as well. The ME voltage coefficient for a structure with a 150 grn thick Metglas layer on both sides of Terfenol-D/Pb（Zr, Ti）O3 laminates at 1 kHz was found to be 1.2 V/cmOe at dc magnetic bias field of 590 Oe under an ac magnetic drive of 1 Oe, which was notably higher in comparison to similar structures with other different Metglas thickness. Key words： laminates composites; magnetoelectric response; magnetic field; Metglas thickness展开更多
Fe BSi C metglas was annealed at an optimized condition（350 °C, 5 min） to achieve the mixed phases with pristine amorphous phase and crystallization phase.With such annealed metglas, a self-biased magnetoelect...Fe BSi C metglas was annealed at an optimized condition（350 °C, 5 min） to achieve the mixed phases with pristine amorphous phase and crystallization phase.With such annealed metglas, a self-biased magnetoelectric（ME） laminate of metglas/Pb（Zr, Ti）O3/metglas was fabricated. Without any external magnetic field, the composite exhibits the ME coefficient aE31 of 103 m V/（cm Oe） at1 k Hz and 15.5 V/（cm Oe） at electromechanical resonance frequency. The induced ME voltage shows a good linear relation to the applied AC magnetic field with amplitude as low as 10-7T at 1 k Hz. It is expected that such self-biased ME composites provide a practical application of economical and compact magnetic sensors.展开更多
Magnetoelectric(ME)composites have recently attracted an ever-increasing interest and provoked a great number of research activities,driven by the potential applications in novel multifunctional devices,such as sensor...Magnetoelectric(ME)composites have recently attracted an ever-increasing interest and provoked a great number of research activities,driven by the potential applications in novel multifunctional devices,such as sensors and transducers[1].Direct ME effect,which describe the appearance of an electric polarization P upon applying a magnetic field H,is usually evaluated by the展开更多
In this paper,the influences of the shape of magnetic material on the magnetoelectric（ME）properties of PZT/Metglas magnetoelectric（ME）composites have been investigated.The results indicate that,with the decrease o...In this paper,the influences of the shape of magnetic material on the magnetoelectric（ME）properties of PZT/Metglas magnetoelectric（ME）composites have been investigated.The results indicate that,with the decrease of the waist length（L w）of the dumbbell-shaped Metglas,the magnetic flux density in the center region and ME coefficients（αME）of the composites increase,while the optimal bias magnetic field H dc decreases on the contrary.In an AC magnetic field of 1 k Hz,the maximumαME（αMax）of the composite with L w=20 mm exhibits 1.3 times larger than that of the one with L w=50 mm,and the optimal H dc deceases by 15%.At the resonant frequencies of each composites,αMax is enhanced by1.3 times as L w decreases from 50 to 20 mm.The simulation made by Comsol Multiphysics and the theoretical analysis based on an equivalent magnetic circuit confirm the experimental results.展开更多
Magnetoelastic resonators made from metal alloy foils are widely used for miniature wireless anti-theft tags and have also been explored for use in various sensing applications.Through annealing within three-dimension...Magnetoelastic resonators made from metal alloy foils are widely used for miniature wireless anti-theft tags and have also been explored for use in various sensing applications.Through annealing within three-dimensional(3D)molds,these foils can be formed into curved structures.Consequently,magnetoelastic materials present an opportunity for the development of a new class of wireless,actuators that have small form factors and low surface profiles and that can conform to curved surfaces.This paper describes passive,wireless,resonant magnetoelastic actuators intended for the generation of fluid flow on the surfaces of implantable Ahmed glaucoma drainage devices.The actuators are remotely excited to resonance using a magnetic field generated by external coils.The fluid flow is intended to limit cellular adhesion to the surface of the implant,as this adhesion can ultimately lead to implant encapsulation and failure.The actuators are micromachined from planar 29-μm-thick foils of Metglas 2826MB(Fe_(40)Ni_(38)Mo_(4)B_(18)),an amorphous magnetoelastic alloy,using photochemical machining.Measuring 10.3×5.6 mm^(2),the planar structures are annealed in 3D molds to conform to the surface of the drainage device,which has an aspherical curvature.Six actuator designs are described,with varying shapes and resonant mode shapes.The resonant frequencies for the different designs vary from 520 Hz to 4.7 kHz.Flow velocities of up to 266μm s^(−1) are recorded at a wireless activation range of 25–30 mm,with peak actuator vibration amplitudes of 1.5μm.Integrated actuators such as those described here have the potential to greatly enhance the effectiveness of glaucoma drainage devices at lowering eye pressure and may also be useful in other areas of medicine.展开更多
The fabrication and properties of a novel double layered surface-mount magnetoelectric（ME） device are investigated and reported. This ME device is made up of two opposite polarized piezoelectric PZT slices bonded on...The fabrication and properties of a novel double layered surface-mount magnetoelectric（ME） device are investigated and reported. This ME device is made up of two opposite polarized piezoelectric PZT slices bonded on the same side of a magnetostrictive material Metglas, forming a novel two PZT in-series device. ME voltage obtained from the two PZT in-series is obviously higher than that of single PZT in a magnetic field with certain value. The ME voltage coefficient（αV） of the surface-mount ME device is significantly enhanced by adjusting the thickness of Metglas： 1） At a frequency of 1 k Hz, αV of this device increases with the layer number of Metglas increased, and the maximum value of αV is about 4.25 times than the minimum; 2） At a frequency of 5 k Hz, the maximum value of αV is 458 mV /Oe, which derives from the ME device with three layers Metglas. This novel design provides an effective way to manufacture miniature and high sensitive ME devices, which makes it possible to apply ME device into integrated circuit（IC）.展开更多
基金Funded by the National Natural Science Foundation of China(No.51172080)
文摘The magnetic field response results on a five-layer structure given as Metglas/Terfenol-D/ Pb（Zr,Ti）O3frerfenol-D/Metglas were reported. Due to its high permeability, Metglas can be incorporated as the third phase into conventional Pb（Zr, Ti）OJTerfenol-D laminates, which results in a stronger magnetoelectric（ME） response. The increase in Metglas thickness significantly influences the ME response as well. The ME voltage coefficient for a structure with a 150 grn thick Metglas layer on both sides of Terfenol-D/Pb（Zr, Ti）O3 laminates at 1 kHz was found to be 1.2 V/cmOe at dc magnetic bias field of 590 Oe under an ac magnetic drive of 1 Oe, which was notably higher in comparison to similar structures with other different Metglas thickness. Key words： laminates composites; magnetoelectric response; magnetic field; Metglas thickness
基金supported by the National Natural Science Foundation of China(51402164 and 51572142)
文摘Fe BSi C metglas was annealed at an optimized condition（350 °C, 5 min） to achieve the mixed phases with pristine amorphous phase and crystallization phase.With such annealed metglas, a self-biased magnetoelectric（ME） laminate of metglas/Pb（Zr, Ti）O3/metglas was fabricated. Without any external magnetic field, the composite exhibits the ME coefficient aE31 of 103 m V/（cm Oe） at1 k Hz and 15.5 V/（cm Oe） at electromechanical resonance frequency. The induced ME voltage shows a good linear relation to the applied AC magnetic field with amplitude as low as 10-7T at 1 k Hz. It is expected that such self-biased ME composites provide a practical application of economical and compact magnetic sensors.
基金supported by the National Natural Science Foundation of China (51402164)
文摘Magnetoelectric(ME)composites have recently attracted an ever-increasing interest and provoked a great number of research activities,driven by the potential applications in novel multifunctional devices,such as sensors and transducers[1].Direct ME effect,which describe the appearance of an electric polarization P upon applying a magnetic field H,is usually evaluated by the
基金Supported by the National Natural Science Foundation of China(51372174,51132001,11364018 and J1210061)Natural Science Foundation of Hubei Province(2014CFB610)the Excellent Young Innovation Team Project of Hubei Province(T201429)
文摘In this paper,the influences of the shape of magnetic material on the magnetoelectric（ME）properties of PZT/Metglas magnetoelectric（ME）composites have been investigated.The results indicate that,with the decrease of the waist length（L w）of the dumbbell-shaped Metglas,the magnetic flux density in the center region and ME coefficients（αME）of the composites increase,while the optimal bias magnetic field H dc decreases on the contrary.In an AC magnetic field of 1 k Hz,the maximumαME（αMax）of the composite with L w=20 mm exhibits 1.3 times larger than that of the one with L w=50 mm,and the optimal H dc deceases by 15%.At the resonant frequencies of each composites,αMax is enhanced by1.3 times as L w decreases from 50 to 20 mm.The simulation made by Comsol Multiphysics and the theoretical analysis based on an equivalent magnetic circuit confirm the experimental results.
文摘Magnetoelastic resonators made from metal alloy foils are widely used for miniature wireless anti-theft tags and have also been explored for use in various sensing applications.Through annealing within three-dimensional(3D)molds,these foils can be formed into curved structures.Consequently,magnetoelastic materials present an opportunity for the development of a new class of wireless,actuators that have small form factors and low surface profiles and that can conform to curved surfaces.This paper describes passive,wireless,resonant magnetoelastic actuators intended for the generation of fluid flow on the surfaces of implantable Ahmed glaucoma drainage devices.The actuators are remotely excited to resonance using a magnetic field generated by external coils.The fluid flow is intended to limit cellular adhesion to the surface of the implant,as this adhesion can ultimately lead to implant encapsulation and failure.The actuators are micromachined from planar 29-μm-thick foils of Metglas 2826MB(Fe_(40)Ni_(38)Mo_(4)B_(18)),an amorphous magnetoelastic alloy,using photochemical machining.Measuring 10.3×5.6 mm^(2),the planar structures are annealed in 3D molds to conform to the surface of the drainage device,which has an aspherical curvature.Six actuator designs are described,with varying shapes and resonant mode shapes.The resonant frequencies for the different designs vary from 520 Hz to 4.7 kHz.Flow velocities of up to 266μm s^(−1) are recorded at a wireless activation range of 25–30 mm,with peak actuator vibration amplitudes of 1.5μm.Integrated actuators such as those described here have the potential to greatly enhance the effectiveness of glaucoma drainage devices at lowering eye pressure and may also be useful in other areas of medicine.
基金Supported by the National Natural Science Foundation of China(51372174,51132001,11364018 and J1210061)the Natural Science Foundation of Hubei Province(2014CFB610)the Excellent Young Innovation Team Project of Hubei Province(T201429)
文摘The fabrication and properties of a novel double layered surface-mount magnetoelectric（ME） device are investigated and reported. This ME device is made up of two opposite polarized piezoelectric PZT slices bonded on the same side of a magnetostrictive material Metglas, forming a novel two PZT in-series device. ME voltage obtained from the two PZT in-series is obviously higher than that of single PZT in a magnetic field with certain value. The ME voltage coefficient（αV） of the surface-mount ME device is significantly enhanced by adjusting the thickness of Metglas： 1） At a frequency of 1 k Hz, αV of this device increases with the layer number of Metglas increased, and the maximum value of αV is about 4.25 times than the minimum; 2） At a frequency of 5 k Hz, the maximum value of αV is 458 mV /Oe, which derives from the ME device with three layers Metglas. This novel design provides an effective way to manufacture miniature and high sensitive ME devices, which makes it possible to apply ME device into integrated circuit（IC）.
