Monolithic processing of a layered flexible robotic actuator film for kinetic electronics

Zhang, Shiyi; Wang, Joseph; Hayashi, Kenshi; Sassa, Fumihiro

doi:10.1038/s41598-021-99500-9

Cited by 7 publications

(5 citation statements)

References 51 publications

(41 reference statements)

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“…The current operation voltage is quite high, but it is more than 3 times smaller than that previously used [42]. Moreover, it is expected to be reduced to the commercial battery tension by reducing the technologically induced magnetic anisotropy and by reducing the PMNPT layer thickness with the use of modern nanoelectromechanical systems technologies [51,52].…”

Section: Discussionmentioning

confidence: 99%

Composite Multiferroic Terahertz Emitter: Polarization Control via an Electric Field

et al. 2022

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Electrical control of conjugate degrees of freedom in multiferroics provides the advantage of reducing energy consumption to femto-and even attojoules per switch in spintronics and memory devices. This is achieved through the development of technologies that make it possible to fabricate artificial materials with constantly improving properties. Here, we present the design, physics, and characteristics of a composite multiferroic spintronic emitter, which provides electrical control of the emitted terahertz (THz) wave polarization. The effect is due to electrical control of the magnetization in a high-quality magnetostrictive superlattice, TbCo2/FeCo, deposited on an anisotropic piezoelectric substrate. In our approach, several mechanisms are realized in the system simultaneously: the strain-mediated coupling of the magnetic and piezoelectric subsystems, which operate in the range of the spin-reorientation transition of the magnetic superlattice, and THz-wave generation in the superlattice by an optical femtosecond pulse. This provides flexibility and control of the set of parameters. We determine the magnetoelectric parameter, which is responsible for THz polarization control. Our results offer a significant fundamental insight into the physics of composite multiferroic systems that can be used for applications of multiferroicity, primarily for THz spintronic emitters. We believe that our findings represent a decisive step towards technologies for other types of spintronic and memory devices.

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Section: Discussionmentioning

confidence: 99%

Composite Multiferroic Terahertz Emitter: Polarization Control via an Electric Field

et al. 2022

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“…These actuators require smaller, lighter, and larger deformations. Many types of actuators exist, e.g., piezoelectric actuators using the inverse piezoelectric effect [6,7], shape memory alloy actuators using the shape memory effect [8,9], and bimetallic actuators using the difference in thermal deformation [10]. In all these, it is difficult to obtain a large self‐generated deformation.…”

Section: Introductionmentioning

confidence: 99%

Texturing to Dramatically Increase Thermal Deformation of Bilayer Film and Application to Actuator

Yamaguchi,

Takahara,

Wakimoto

et al. 2024

IEEJ Transactions Elec Engng

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The effect of adding texture to increase the deformation of a bilayer actuator by a factor of over 100 was demonstrated. A bilayer actuator is driven by the difference in thermal deformation. Therefore, two films or plates with a large difference in thermal expansion coefficient are required. The newly developed textured film actuator (TFA) obtained large deformation even in a case involving a combination of two films with a small difference in thermal expansion coefficient. The TFA was fabricated by transferring the texture when laminating two PI films with different coefficients of thermal expansion. A TFA with thin‐film electrodes was heated by applying electric power. Thereby, it unfolded from a curled state. The maximum generated force and curvature of the TFA were 7.4 mN and 0.19 mm−1, respectively, at 0.38 W. The manufacturing process for the TFA is simple and convenient, as it does not require adhesives or special materials. In thermal drive bilayer actuator fabrication, the range of material selection is expanded substantially. In addition, large deformations are generated with less energy. Therefore, the energy consumption is likely to be reduced. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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“…Decades of industrial development and scientific research have led to increasing use of robotics in daily life and engineering tasks. – This field has become extremely active with the recent developments of soft pneumatic robotics that have excellent deformability, adaptability in unstructured environments and safety for human–machine interaction due to their inherent softness. – To further extend the capabilities of these soft robotics, sensorized actuators that can respond to external stimuli and sense self-deformation by mimicking biological systems are desirable. Efforts in self-sensing robotics have combined soft actuators with flexible sensors to either ensure a stable and self-adaptive deformation in response to the surrounding environment or use the information generated by the sensors to accurately regulate the control system for actuation. – However, recent soft robotics have difficulties in ideally matching with conventional add-on sensors, generally suffering from incompatible surface interaction, poor connection, along with possible stress concentration, and manufacturing complexity. – …”

Section: Introductionmentioning

confidence: 99%

Knitting from Nature: Self-Sensing Soft Robotics Enabled by All-in-One Knit Architectures

Yang,

Sun,

et al. 2023

ACS Appl. Mater. Interfaces

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Self-sensing soft robotics that mimic the proprioception and exteroception abilities of natural biological systems have shown great potential in challenging applications. However, current add-on strategies that simply combine sensors with actuators by post processing generally suffer from poor compatibility in mechanical properties, interfacing problems, complex manufacturing, and high cost. Herein, we present knitted soft robotics with build-in textile-integrated multimodal sensors, where the knit structure is used not only as a physical actuating layer but also as a sensing functional component. Based on different knit-stitch arrangements, an all-in-one knitted electronic skin with functions of neurons, sensing, and actuation in a single knit-structured fabric layer is constructed. The knitted electronic skin is then integrated into knitted soft robotics, enabling a proprioceptive sense of actuation deformation and an exteroceptive perception of ambient stimuli with minimized interferences for actuation. In addition, the tuck stitches serve as an anisotropic strain-limiting layer to increase the actuating energy efficiency, which resolves the key conflict of softness and volumetric power density in soft actuators. This design strategy provides a convenient, low-cost, and customized method to bring about structural and functional integrability into soft actuators, greatly extending the adaptability of current soft robotics for real-world applications.

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Monolithic processing of a layered flexible robotic actuator film for kinetic electronics

Cited by 7 publications

References 51 publications

Composite Multiferroic Terahertz Emitter: Polarization Control via an Electric Field

Composite Multiferroic Terahertz Emitter: Polarization Control via an Electric Field

Texturing to Dramatically Increase Thermal Deformation of Bilayer Film and Application to Actuator

Knitting from Nature: Self-Sensing Soft Robotics Enabled by All-in-One Knit Architectures

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