In the era of Metaverse and virtual reality(VR)/augmented reality(AR),capturing finger motion and force interactions is crucial for immersive human-machine interfaces.This study introduces a flexible electronic skin f...In the era of Metaverse and virtual reality(VR)/augmented reality(AR),capturing finger motion and force interactions is crucial for immersive human-machine interfaces.This study introduces a flexible electronic skin for the index finger,addressing coupled perception of both state and process in dynamic tactile sensing.The device integrates resistive and giant magnetoelastic sensors,enabling detection of surface pressure and finger joint bending.This e-skin identifies three phases of finger action:bending state,dynamic normal force and tangential force(sweeping).The system comprises resistive carbon nanotubes(CNT)/polydimethylsiloxane(PDMS)films for bending sensing and magnetoelastic sensors(NdFeB particles,EcoFlex,and flexible coils)for pressure detection.The inward bending resistive sensor,based on self-assembled microstructures,exhibits directional specificity with a response time under 120 ms and bending sensitivity from 0°to 120°.The magnetoelastic sensors demonstrate specific responses to frequency and deformation magnitude,as well as sensitivity to surface roughness during sliding and material hardness.The system’s capability is demonstrated through tactile-based bread type and condition recognition,achieving 92%accuracy.This intelligent patch shows broad potential in enhancing interactions across various fields,from VR/AR interfaces and medical diagnostics to smart manufacturing and industrial automation.展开更多
Theamorphous magnetoelastic Fe66Co17Si1B6 thin films have been deposited by dc magnetron sputtering.A lot of"nano-trenches"have been observed on the fdm surfaces by AFM.The permeability of amorphous Fe66COlT...Theamorphous magnetoelastic Fe66Co17Si1B6 thin films have been deposited by dc magnetron sputtering.A lot of"nano-trenches"have been observed on the fdm surfaces by AFM.The permeability of amorphous Fe66COlTSilB6 thin films was measured within the frequency range of 0.6GHz-10.2 GHz.The ferromagnetic resonance frequency was found to be 1.2 GHz.MFM shows that the domain of thin film is a maze-type pattern,which indicates that an out-of-plane magnetic anisotropy exists.The out-of-plane anisotropy is believed due to the stress-induced magnetic anisotropy.It can be inferred that the internal stress is tensile stress and normal to the film plane.展开更多
The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external field.The intrinsic magnetic ...The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external field.The intrinsic magnetic damping constant,which should do not vary with the external magnetic field,exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co_(2)FeAl/GaAs heterostructure.The experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition,which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co_(2)FeAl.Our experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect,suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.展开更多
Humanoid robot joints require real-time torque detection to provide accurate force feedback informa-tion for the control system.To meet the measurement requirements and realize the miniaturization of the sensor,a torq...Humanoid robot joints require real-time torque detection to provide accurate force feedback informa-tion for the control system.To meet the measurement requirements and realize the miniaturization of the sensor,a torque sensor based on the magnetoelastic effect is developed,utilizing planar spiral coils as detection probes.In this work,a planar spiral coil mutual inductance calculation model is established to solve the mutual inductance coefficient,and the mechanical structure and circuit design of the sensor are completed.Finally,a torque loading platform is built to perform calibration experiments,and the hysteresis model is improved to compensate for the hysteresis phenomenon.The calibration results indicate that the sensor shows excellent loaded nonlinearity of 3.08%F.S.,unloaded nonlinearity of 2.71% F.S.,loaded repeatability of 2.48% F.S.,unloaded repeatability of 1.89% F.S.and hysteresis of 1.9% F.S.,at a compact probe size of 13.8×9.9×1.8 mm.展开更多
Magnetic pressure sensors that employ magneto-elastomers to convert pressure stimuli into detectable magnetic signals are widely regarded as promising components for smart wearables.However,achieving both an ultralow ...Magnetic pressure sensors that employ magneto-elastomers to convert pressure stimuli into detectable magnetic signals are widely regarded as promising components for smart wearables.However,achieving both an ultralow detection limit and a broad sensing range within a single device remains a persistent challenge.Here,we present a magnetic amorphous-wire pressure sensor(MAWPS)that simultaneously attains these properties through a multilayer architecture designed to generate a tunable magnetic-field configuration.The device comprises a force-to-magnetic conversion unit(FMCU)and a magnetic sensing unit(MSU).The FMCU incorporates a composite magneto-elastomer formed by integrating cilia-type and film-type structures with opposite magnetization orientations.The magnetic cilia,characterized by low modulus,allows to detect subtle pressure,while the higher-modulus magnetic films modulate the intensity and direction of the magnetic field under larger pressure.This cooperative mechanism ensures that the magnetic field detected by magnetic amorphous wire of MSU remains within the sensitive range.As a result,the MAWPS exhibits a detection limit of 2.4 Pa,a sensing range exceeding 300 kPa,rapid response,and excellent stability.Furthermore,asymmetric wire placement enables shear-direction sensing ability.We further demonstrate the applicability in smart wearable scenarios,including respiratory monitoring,object grasping,morphology recognition,and stress direction sensing.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12204271)Shenzhen Science and Technology Program(Grant No.JCYJ20220530141014032)Guangdong Basic and Applied Basic Research Foundation program(Grant No.2022A1515011526),China.
文摘In the era of Metaverse and virtual reality(VR)/augmented reality(AR),capturing finger motion and force interactions is crucial for immersive human-machine interfaces.This study introduces a flexible electronic skin for the index finger,addressing coupled perception of both state and process in dynamic tactile sensing.The device integrates resistive and giant magnetoelastic sensors,enabling detection of surface pressure and finger joint bending.This e-skin identifies three phases of finger action:bending state,dynamic normal force and tangential force(sweeping).The system comprises resistive carbon nanotubes(CNT)/polydimethylsiloxane(PDMS)films for bending sensing and magnetoelastic sensors(NdFeB particles,EcoFlex,and flexible coils)for pressure detection.The inward bending resistive sensor,based on self-assembled microstructures,exhibits directional specificity with a response time under 120 ms and bending sensitivity from 0°to 120°.The magnetoelastic sensors demonstrate specific responses to frequency and deformation magnitude,as well as sensitivity to surface roughness during sliding and material hardness.The system’s capability is demonstrated through tactile-based bread type and condition recognition,achieving 92%accuracy.This intelligent patch shows broad potential in enhancing interactions across various fields,from VR/AR interfaces and medical diagnostics to smart manufacturing and industrial automation.
文摘Theamorphous magnetoelastic Fe66Co17Si1B6 thin films have been deposited by dc magnetron sputtering.A lot of"nano-trenches"have been observed on the fdm surfaces by AFM.The permeability of amorphous Fe66COlTSilB6 thin films was measured within the frequency range of 0.6GHz-10.2 GHz.The ferromagnetic resonance frequency was found to be 1.2 GHz.MFM shows that the domain of thin film is a maze-type pattern,which indicates that an out-of-plane magnetic anisotropy exists.The out-of-plane anisotropy is believed due to the stress-induced magnetic anisotropy.It can be inferred that the internal stress is tensile stress and normal to the film plane.
基金This work was supported by the National Key R&D Program of China(No.2017YFB0405700)National Natural Science Foundation of China(No.12074370).
文摘The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external field.The intrinsic magnetic damping constant,which should do not vary with the external magnetic field,exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co_(2)FeAl/GaAs heterostructure.The experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition,which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co_(2)FeAl.Our experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect,suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.
基金supported in part by Guangxi Science and Technology Program,China(2024AB12006)the Open Fund of Innovation Center for Control Actuators,China(ICCA18-202405)China Huaneng Group.,Ltd.Headquarters Technology Project(HNKJ24-HF15).
文摘Humanoid robot joints require real-time torque detection to provide accurate force feedback informa-tion for the control system.To meet the measurement requirements and realize the miniaturization of the sensor,a torque sensor based on the magnetoelastic effect is developed,utilizing planar spiral coils as detection probes.In this work,a planar spiral coil mutual inductance calculation model is established to solve the mutual inductance coefficient,and the mechanical structure and circuit design of the sensor are completed.Finally,a torque loading platform is built to perform calibration experiments,and the hysteresis model is improved to compensate for the hysteresis phenomenon.The calibration results indicate that the sensor shows excellent loaded nonlinearity of 3.08%F.S.,unloaded nonlinearity of 2.71% F.S.,loaded repeatability of 2.48% F.S.,unloaded repeatability of 1.89% F.S.and hysteresis of 1.9% F.S.,at a compact probe size of 13.8×9.9×1.8 mm.
基金supported by National Key R&D Program of China(2024YFB3814100)National Natural Science Foundation of China(U24A20228,U24A6001,52127803)+4 种基金supported by the Jiangxi Youth Science and Technology Talent Development Program(20244BCE52245)the General Scientific Research Project of the Jiangxi Provincial Department of Education(GJJ2401512)Doctoral research start-up project(JZB2403)Ji'an Key Science and Technology Program(20255-071665)Ningbo Key Research and Development Program(2024Z148,2024Z143,2024Z199,2024Z171).
文摘Magnetic pressure sensors that employ magneto-elastomers to convert pressure stimuli into detectable magnetic signals are widely regarded as promising components for smart wearables.However,achieving both an ultralow detection limit and a broad sensing range within a single device remains a persistent challenge.Here,we present a magnetic amorphous-wire pressure sensor(MAWPS)that simultaneously attains these properties through a multilayer architecture designed to generate a tunable magnetic-field configuration.The device comprises a force-to-magnetic conversion unit(FMCU)and a magnetic sensing unit(MSU).The FMCU incorporates a composite magneto-elastomer formed by integrating cilia-type and film-type structures with opposite magnetization orientations.The magnetic cilia,characterized by low modulus,allows to detect subtle pressure,while the higher-modulus magnetic films modulate the intensity and direction of the magnetic field under larger pressure.This cooperative mechanism ensures that the magnetic field detected by magnetic amorphous wire of MSU remains within the sensitive range.As a result,the MAWPS exhibits a detection limit of 2.4 Pa,a sensing range exceeding 300 kPa,rapid response,and excellent stability.Furthermore,asymmetric wire placement enables shear-direction sensing ability.We further demonstrate the applicability in smart wearable scenarios,including respiratory monitoring,object grasping,morphology recognition,and stress direction sensing.
