scholarly journals Acoustic streaming vortices enable contactless, digital control of droplets

2020 ◽  
Vol 6 (24) ◽  
pp. eaba0606 ◽  
Author(s):  
Peiran Zhang ◽  
Chuyi Chen ◽  
Xingyu Su ◽  
John Mai ◽  
Yuyang Gu ◽  
...  
Keyword(s):  
Digital Control ◽  
Acoustic Streaming ◽  
Lab On A Chip ◽  
Cross Contamination ◽  
Basic Logic ◽  
Electrical Signals ◽  
Electrical Control ◽  
Logic Operations ◽  
Contact Free ◽  
Hydrodynamic Equilibrium

Advances in lab-on-a-chip technologies are driven by the pursuit of programmable microscale bioreactors or fluidic processors that mimic electronic functionality, scalability, and convenience. However, few fluidic mechanisms allow for basic logic operations on rewritable fluidic paths due to cross-contamination, which leads to random interference between “fluidic bits” or droplets. Here, we introduce a mechanism that allows for contact-free gating of individual droplets based on the scalable features of acoustic streaming vortices (ASVs). By shifting the hydrodynamic equilibrium positions inside interconnected ASVs with multitonal electrical signals, different functions such as controlling the routing and gating of droplets on rewritable fluidic paths are demonstrated with minimal biochemical cross-contamination. Electrical control of this ASV-based mechanism allows for unidirectional routing and active gating behaviors, which can potentially be scaled to functional fluidic processors that can regulate the flow of droplets in a manner similar to the current in transistor arrays.

Electric-field control of field-free spin-orbit torque switching via laterally modulated Rashba effect in Pt/Co/AlOx structures

2020 ◽  
Author(s):  
Min-Gu Kang ◽  
Jong-Guk Choi ◽  
Jimin Jeong ◽  
Jae Yeol Park ◽  
Hyeon-Jong Park ◽  
...  
Keyword(s):  
Electric Field ◽  
Coupling Effect ◽  
Spin Orbit ◽  
Rashba Effect ◽  
Oxide Interface ◽  
Electrical Control ◽  
Perpendicular Magnetization ◽  
Field Control ◽  
Out Of Plane ◽  
Logic Operations

Abstract Spin-orbit coupling effect in structures with broken inversion symmetry, known as the Rashba effect, facilitates spin-orbit torques (SOTs) in heavy metal/ferromagnet/oxide structures, along with the spin Hall effect. Electric-field control of the Rashba effect is established for semiconductor interfaces, but it is challenging in structures involving metals owing to the screening effect. Here, we report that the Rashba effect in Pt/Co/AlOx structures is laterally modulated by electric voltages, generating out-of-plane SOTs. This enables field-free switching of the perpendicular magnetization and electrical control of the switching polarity. Changing the gate oxide reverses the sign of out-of-plane SOT while maintaining the same sign of voltage-controlled magnetic anisotropy, which confirms the Rashba effect at the Co/oxide interface is a key ingredient of the electric-field modulation. The electrical control of SOT switching polarity in a reversible and non-volatile manner can be utilized for programmable logic operations in spintronic logic-in-memory devices.

Contact-Free MEMS Devices for Reliable and Low-Power Logic Operations

2021 ◽  
pp. 1-6
Author(s):  
Y. Perrin ◽  
A. Galisultanov ◽  
L. Hutin ◽  
P. Basset ◽  
H. Fanet ◽  
...  
Keyword(s):  
Low Power ◽  
Mems Devices ◽  
Logic Operations ◽  
Low Power Logic ◽  
Contact Free

Lab-on-a-chip using acoustic streaming for mixing and pumping fluids

2011 ◽  
Author(s):  
V. F. Cardoso ◽  
S. O. Catarino ◽  
S. Lanceros-Mendez ◽  
G. Minas
Keyword(s):  
Acoustic Streaming ◽  
Lab On A Chip

scholarly journals Electric-field control of field-free spin-orbit torque switching via laterally modulated Rashba effect in Pt/Co/AlOx structures

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Min-Gu Kang ◽  
Jong-Guk Choi ◽  
Jimin Jeong ◽  
Jae Yeol Park ◽  
Hyeon-Jong Park ◽  
...  
Keyword(s):  
Electric Field ◽  
Coupling Effect ◽  
Spin Orbit ◽  
Rashba Effect ◽  
Oxide Interface ◽  
Electrical Control ◽  
Perpendicular Magnetization ◽  
Field Control ◽  
Out Of Plane ◽  
Logic Operations

AbstractSpin-orbit coupling effect in structures with broken inversion symmetry, known as the Rashba effect, facilitates spin-orbit torques (SOTs) in heavy metal/ferromagnet/oxide structures, along with the spin Hall effect. Electric-field control of the Rashba effect is established for semiconductor interfaces, but it is challenging in structures involving metals owing to the screening effect. Here, we report that the Rashba effect in Pt/Co/AlOx structures is laterally modulated by electric voltages, generating out-of-plane SOTs. This enables field-free switching of the perpendicular magnetization and electrical control of the switching polarity. Changing the gate oxide reverses the sign of out-of-plane SOT while maintaining the same sign of voltage-controlled magnetic anisotropy, which confirms the Rashba effect at the Co/oxide interface is a key ingredient of the electric-field modulation. The electrical control of SOT switching polarity in a reversible and non-volatile manner can be utilized for programmable logic operations in spintronic logic-in-memory devices.

scholarly journals Three dimensional acoustic tweezers with vortex streaming

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Junfei Li ◽  
Alexandru Crivoi ◽  
Xiuyuan Peng ◽  
Lu Shen ◽  
Yunjiao Pu ◽  
...  
Keyword(s):  
Acoustic Streaming ◽  
Three Dimensional ◽  
Radiation Force ◽  
Two Dimensions ◽  
Single Beam ◽  
Scale Particle ◽  
Acoustic Tweezers ◽  
Third Dimension ◽  
Contact Free ◽  
Micrometer Scale

AbstractAcoustic tweezers use ultrasound for contact-free manipulation of particles from millimeter to sub-micrometer scale. Particle trapping is usually associated with either radiation forces or acoustic streaming fields. Acoustic tweezers based on single-beam focused acoustic vortices have attracted considerable attention due to their selective trapping capability, but have proven difficult to use for three-dimensional (3D) trapping without a complex transducer array and significant constraints on the trapped particle properties. Here we demonstrate a 3D acoustic tweezer in fluids that uses a single transducer and combines the radiation force for trapping in two dimensions with the streaming force to provide levitation in the third dimension. The idea is demonstrated in both simulation and experiments operating at 500 kHz, and the achieved levitation force reaches three orders of magnitude larger than for previous 3D trapping. This hybrid acoustic tweezer that integrates acoustic streaming adds an additional twist to the approach and expands the range of particles that can be manipulated.

The Realization of Linear Motion Control in Dedicated Digital Control of Marking

2011 ◽  
Vol 317-319 ◽  
pp. 142-145
Author(s):  
Yue Ting Yang ◽  
Xin Chen ◽  
Gao Feng Cheng
Keyword(s):  
Motion Control ◽  
Cylindrical Surface ◽  
Digital Control ◽  
Control Algorithm ◽  
Control Program ◽  
Linear Motion ◽  
Uniform Acceleration ◽  
Compensation Control ◽  
Surface Marking ◽  
Logic Operations

In this paper, using Bresenham line algorithm and uniform acceleration , uniform deceleration control algorithm, Combining compensation control about Z-axis motion on cylindrical surface, the author has writed a complete linear motion control program by integer addition, subtraction, logic operations. The program applies to specific numerical marking machine, you can part the plane, cylindrical surface marking.

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