Observation of magnon-mediated electric current drag at room temperature

2016 ◽  
Vol 93 (6) ◽  
Author(s):  
H. Wu ◽  
C. H. Wan ◽  
X. Zhang ◽  
Z. H. Yuan ◽  
Q. T. Zhang ◽  
...  
Keyword(s):  
Electric Current ◽  
Room Temperature ◽  
Current Drag

scholarly journals Dynamic transition of current-driven single-skyrmion motion in a room-temperature chiral-lattice magnet

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Licong Peng ◽  
Kosuke Karube ◽  
Yasujiro Taguchi ◽  
Naoto Nagaosa ◽  
Yoshinori Tokura ◽  
...  
Keyword(s):  
Electric Current ◽  
Motion Tracking ◽  
Room Temperature ◽  
Dynamic Transition ◽  
Spintronic Devices ◽  
Transmission Electron ◽  
Flow Motion ◽  
Lorentz Transmission Electron Microscopy ◽  
And Control

AbstractDriving and controlling single-skyrmion motion promises skyrmion-based spintronic applications. Recently progress has been made in moving skyrmionic bubbles in thin-film heterostructures and low-temperature chiral skyrmions in the FeGe helimagnet by electric current. Here, we report the motion tracking and control of a single skyrmion at room temperature in the chiral-lattice magnet Co9Zn9Mn2 using nanosecond current pulses. We have directly observed that the skyrmion Hall motion reverses its direction upon the reversal of skyrmion topological number using Lorentz transmission electron microscopy. Systematic measurements of the single-skyrmion trace as a function of electric current reveal a dynamic transition from the static pinned state to the linear flow motion via a creep event, in agreement with the theoretical prediction. We have clarified the role of skyrmion pinning and evaluated the intrinsic skyrmion Hall angle and the skyrmion velocity in the course of the dynamic transition. Our results pave a way to skyrmion applications in spintronic devices.

scholarly journals Disinfection of drinking and bathing water with oxyl

2002 ◽  
Vol 56 (2) ◽  
pp. 50-53
Author(s):  
Marjana Simonic
Keyword(s):  
Sodium Chloride ◽  
Electric Current ◽  
Laboratory Tests ◽  
Room Temperature ◽  
Tap Water ◽  
Treated Water ◽  
Bathing Water ◽  
Before And After ◽  
The Stability

An electrolysed solution of sodium chloride was examined for its disinfection potential in drinking and bathing water. The electrolysis of NaCl ((=1%) in tap water was performed at room temperature using a 10 A electric current in an electrolysis apparatus. Some laboratory tests were made, initially to determine the stability and efficiency of the disinfectant. Chemical and microbiological measurements of the treated water (according to DIN 19643 for bathing water) were then carried out before and after addition of the disinfectant agent.

Negative conductivity of graphene with direct electric current

2021 ◽  
Author(s):  
I.M. Moiseenko ◽  
V.V. Popov ◽  
D.V. Fateev
Keyword(s):  
Reflection Coefficient ◽  
Electric Current ◽  
Terahertz Radiation ◽  
Room Temperature ◽  
Negative Real Part ◽  
Wave Incident ◽  
Thz Radiation ◽  
Direct Electric Current ◽  
Radiation Sources ◽  
Dc Current

Problem formulating. Currently, there are no compact, efficient terahertz radiation sources operating at room temperature. To create such sources and amplifiers, structures based on graphene with DC-current can be used. Goal. Finding conditions for achieving the negative real part of graphene conductivity and amplification of THz radiation in graphene with a direct electric current. Result. It is shown that for a certain value of direct electric current in graphene, the reflection coefficient of the THz wave incident on the structure based on graphene with DC-current exceeds unity, which indicates the amplification of THz radiation in the structure. The amplification of the THz radiation in graphene is achieved due to negative values of the real part of the graphene conductivity. Practical meaning. Results can be used to create sources and amplifiers of terahertz radiation.

Study on a Novel Electrical-Assisted Pressure Welding Process of Thin Metallic Foils

2012 ◽  
Vol 271-272 ◽  
pp. 147-151 ◽  
Author(s):  
Zhu Tian Xu ◽  
Lin Fa Peng ◽  
Pei Yun Yi ◽  
Xin Min Lai
Keyword(s):  
Stainless Steel ◽  
Electric Current ◽  
Room Temperature ◽  
Welding Process ◽  
Process Conditions ◽  
Pressure Welding ◽  
Metal Sheets ◽  
Effects Of Temperature ◽  
Metallic Foils ◽  
Joining Process

Joining of very thin metallic foils is required in vast applications such as fuel cell plates, micro reactor carriers, heat exchanger etc. Pressure welding is found to be an efficient method. However, some metals (e.g., stainless steel) are difficult to achieve successful solid state bond at room temperature. In present study, a novel electric assisted pressure welding (EAPW) process was proposed. In the EAPW process, electric current was introduced to the metal sheets under pressure welding in the purpose of reducing welding difficulty. An EAPW experimental setup was developed to study the joining process of Stainless Steel (SS) 316 sheets. The effects of electric current as well as process conditions on the final bond strength were experimentally studied. It was found that SS316 sheets could not be bonded without current at room temperature. However, they were successfully joined with electric current introduced. The co-effects of temperature and electric current were also investigated experimentally. It was found that elevated temperature caused by Joule heat is not the only reason for the improvement of the welding performance. The so-called electro-plastic effect also makes a contribution in EAPW process. Finite element method (FEM) was also employed to analyze the process and the welding behavior was discussed.

Ferrimagnetic Behavior and Magnetoresistance of Fe/Gd Double Structured Multilayer Films

1991 ◽  
Vol 231 ◽  
Author(s):  
H. Fujimori ◽  
Y. Kamiguchi ◽  
Y. Hayakawa ◽  
K. Takanashi
Keyword(s):  
Magnetic Fields ◽  
Electric Current ◽  
Room Temperature ◽  
Multilayer Films ◽  
The Other ◽  
Compensation Temperature ◽  
Minimum Value ◽  
Layer Magnetization

AbstractWe prepared Fe/Gd double structured multilayer films (DSMLF's). The Fe/Gd DSMLF has a longer period λl, and it is composed of alternate stacking of two types of Fe/Gd submultilayers with a shorter period λs. One type of Fe/Gd submultilayers has dominant Fe layer magnetization, and the other, dominant Gd layer magnetization. λs was varied in the range from 12 to 100Å, keeping λl to about 250Å. The magnetization of Fe/Gd DSMLF's with λs≦36Å shows a spin-flop in magnetic fields lower than 1k0e at room temperature. The compensation temperature Tcomp was found to decrease with increasing λs. Tcomp crosses room temperature at λs=24Å, and then the spinflop field Hsf at room temperature takes a minimum value of the order of a few tens oersteds. Thus, we show that Hsf at room temperature can easily be tuned to a desired value by varying λs. Longitudinal (pl) and transverse (pt) magnetoresistances show a crossover, depending on the angle between directions of the electric current and of the Fe layer magnetization.

Effect of Atmosphere on Zinc Oxide Crystal Growth by Electric Current Heating with Au Catalyst

2006 ◽  
Vol 11-12 ◽  
pp. 269-272 ◽  
Author(s):  
Kenichi Minato ◽  
Tomoichiro Okamoto ◽  
Masasuke Takata
Keyword(s):  
Zinc Oxide ◽  
Crystal Growth ◽  
Electric Current ◽  
Room Temperature ◽  
Visible Emission ◽  
Au Catalyst ◽  
Uv Emission ◽  
Oxide Crystal ◽  
Growth Method ◽  
Zno Crystal

We developed a new zinc oxide (ZnO) crystal growth method using Au combined with electric current heating. Au paste was placed on a ZnO ceramic bar. When a certain current flowed through the bar, the paste melted on the bar. Then crystals grew on the molten Au surface immediately. The shape of the crystals depended on the atmosphere during the growth. The whiskers with spherical top and the crystals consisting of a hexangular pyramidal base and needle head were grown on Au in air and Ar atmosphere, respectively. From cathodoluminescence at room temperature, the weak ultraviolet (UV) emission at approximately 3.2 eV and the strong visible emission at approximately 2.3 eV were observed from the whisker grown in air. The UV emission at approximately 3.3 eV dominated a spectrum from the pyramidal crystal grown in Ar atmosphere.

scholarly journals Усиление терагерцовых электромагнитных волн в структуре с двумя слоями графена при протекании постоянного электрического тока: гидродинамическое приближение

2021 ◽  
Vol 55 (8) ◽  
pp. 649
Author(s):  
И.М. Моисеенко ◽  
В.В Попов ◽  
Д.В. Фатеев
Keyword(s):  
Electric Current ◽  
Room Temperature ◽  
Spatial Dispersion ◽  
Terahertz Wave ◽  
Charge Carriers ◽  
Amplification Efficiency ◽  
Terahertz Frequency ◽  
Terahertz Frequency Range ◽  
Direct Electric Current ◽  
Graphene Layers

The amplification of electromagnetic terahertz radiation in a structure with two layers of hydrodynamic graphene with a direct electric current is studied theoretically. The hydrodynamic conductivity of graphene is investigated. It is shown that the real part of the graphene conductivity can be negative in the terahertz frequency range at the drift velocities of charge carriers in graphene that are lower than the phase velocity of the electromagnetic wave. For small wavevectors of a terahertz wave incident on a graphene structure, the spatial dispersion insignificantly contributes to the hydrodynamic graphene conductivity. Because of this, the amplification efficiency does not depend on the direction of currents in each of the graphene layers. It is shown that graphene with direct electric current can be used to create THz amplifiers operating at room temperature.

Effect of Growth Conditions on the Cathodoluminescence of β-Ga2O3 Crystals Grown by Electric Current Heating Method

2006 ◽  
Vol 301 ◽  
pp. 181-184 ◽  
Author(s):  
Kenichi Suzuki ◽  
Yuichiro Kuroki ◽  
Tomoichiro Okamoto ◽  
Masasuke Takata
Keyword(s):  
Ambient Temperature ◽  
Electric Current ◽  
Gallium Oxide ◽  
Room Temperature ◽  
Blue Emission ◽  
Growth Conditions ◽  
Ultraviolet Emission ◽  
Heating Method ◽  
Effective Factors ◽  
Ambient Temperatures

Beta gallium oxide (β-Ga2O3) crystals were grown on β-Ga2O3 ceramics heated by electric current under vacuum at various ambient temperatures. From cathodoluminescence at room temperature, emission peaks at 2.9 and 3.5 eV were clearly observed. With increasing ambient temperature, the relative intensity of ultraviolet emission (3.5 eV) to blue emission (2.9 eV) showed a peak at 400oC. These results suggest that the ambient temperature during the electric current heating of β-Ga2O3 ceramics in vacuum is one of the most effective factors for the ultraviolet emissive β-Ga2O3 crystal.

scholarly journals Light emission induced by electric current at room temperature through the defect networks of MgO nanocubes

AIP Advances ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 125305
Author(s):  
Changhyuk Kim ◽  
Peter V. Pikhitsa ◽  
Sukbyung Chae ◽  
Kyungil Cho ◽  
Mansoo Choi
Keyword(s):  
Electric Current ◽  
Room Temperature ◽  
Light Emission
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