Rotational motion of a magnetic vortex in a circular disk induced by injection of an electric current through an off-centered point contact

2014 ◽  
Vol 90 (21) ◽  
Author(s):  
Hiroshi Tsukahara ◽  
Hiroshi Imamura
Keyword(s):  
Electric Current ◽  
Rotational Motion ◽  
Point Contact ◽  
Circular Disk ◽  
Magnetic Vortex

CURRENT-DRIVEN MAGNONS IN MAGNETIC MULTILAYERS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 2957-2957
Author(s):  
M. TSOI
Keyword(s):  
Electric Current ◽  
Driving Force ◽  
Current Flow ◽  
Point Contact ◽  
Magnetic Multilayers ◽  
Fluctuation Phenomena ◽  
Adjacent Layer ◽  
Acoustic Wave Generation ◽  
Current Densities ◽  
Spin Momentum

Spin waves, or magnons, are intrinsic excitations in magnetic materials and have attracted considerable attention since introduced by Bloch in 1930.1 Recently ideas of spintronics have impacted this field dramatically. Berger2 and Sloczewski3 introduced completely new aspects of the physics of metallic ferromagnets in the presence of an electric current of high density. Excitation of magnons by an electric current has been predicted and seen in magnetic multilayers,4-6 where the driving force for the excitations is the spin-momentum transfer associated with an electric current flow. We have developed a microcontact technique (magnetic microcontact spectroscopy) to investigate the current-driven magnon generation.4,5 In our experiments we inject current densities as high as 109 A/cm2 into a Co/Cu multi-layer through a point contact made using a sharpened Ag wire carefully brought into contact with a multi-layer file. We observe current-driven magnons in multi-layers with both ferromagnetic4,5 and antiferromagnetic7 configuration of the adjacent layer magnetizations. Some further interesting applications of the technique, particularly, for studying fluctuation phenomena, resonant magnon generation, acoustic wave generation, etc., will be presented.

Magnetic vortex gyration mediated by point-contact position

2019 ◽  
Vol 28 (10) ◽  
pp. 107503
Author(s):  
Hua-Nan Li ◽  
Zi-Wei Fan ◽  
Jia-Xin Li ◽  
Yue Hu ◽  
Hui-Lian Liu
Keyword(s):  
Point Contact ◽  
Magnetic Vortex ◽  
Contact Position

Magnetic Vortex Core Oscillations in Multi Point Contact Spin Valve Stacks

2012 ◽  
Vol 48 (11) ◽  
pp. 3811-3813 ◽  
Author(s):  
G. Hrkac ◽  
D. Hahn ◽  
L. Saharan ◽  
T. Schrefl ◽  
Joo-Von Kim ◽  
...  
Keyword(s):  
Vortex Core ◽  
Spin Valve ◽  
Point Contact ◽  
Magnetic Vortex

scholarly journals On the production of vibrations and sounds by electrolysis

1863 ◽  
Vol 12 ◽  
pp. 217-236
Keyword(s):  
Liquid Metal ◽  
Electric Current ◽  
Sheet Glass ◽  
Royal Society ◽  
Thin Sheet ◽  
Circular Disk ◽  
Mutual Contact

1. Under some circumstances, which I have already briefly recorded (Proceedings of the Royal Society, No. 44. p. 177), vibrations of singular beauty, accompanied by definite sounds, are produced at the surfaces of mutual contact of a liquid metal and electrolyte by the passage of an electric current. 2. The most convenient mode of obtaining the vibrations and sounds is as follows. Take a circular disk of thin sheet glass about 2 or 3 inches in diameter, and procure a thin hoop of glass about 1 inch wide and of the same diameter as the disk, by cutting off the end of an ordinary glass shade.

Fast chirality reversal of the magnetic vortex by electric current

2014 ◽  
Vol 105 (22) ◽  
pp. 222405 ◽  
Author(s):  
W. L. Lim ◽  
R. H. Liu ◽  
T. Tyliszczak ◽  
S. G. Erokhin ◽  
D. Berkov ◽  
...  
Keyword(s):  
Electric Current ◽  
Magnetic Vortex

Structure of sheet blanks from VT6S titanium alloy after local deformation during pulse heating by electric current

2020 ◽  
pp. 512-519
Author(s):  
S.V. Smirnov ◽  
V.V. Ovchinnikov
Keyword(s):  
Titanium Alloy ◽  
Electric Current ◽  
Current Pulse ◽  
Pulse Heating ◽  
Pulse Current ◽  
Point Contact ◽  
Local Deformation ◽  
Vt6s Titanium Alloy ◽  
Heated State ◽  
Contact Welding

The local deformation process of blanks in the form of thin discs from VT6S titanium alloy with the use of pulse heating by electric current and deformation in heated state in the electrodes of the point contact welding machine is studied. The rational values of the process parameters (pulse current, pulse duration and precipitation force) are defi ned. Analysis of the microstructure for the VT6S alloy in its original state and after deformation with heating did not reveal signifi cant increase in grain and the formation of thick alpha layer. The increasing in the plasticity of the VT6S alloy after passing of the current pulse is established. At the same time, in the structure of the deformed zone noted the presence of double.

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