Observation of frequency dependent resonances in magnetic vortex core gyration using time-resolved magneto-optical Kerr microscope with pulsed semiconductor laser illumination

2021 ◽  
Author(s):  
Takeshi Ogasawara ◽  
Akinobu YAMAGUCHI
Keyword(s):  
Optical Fiber ◽  
Resonance Frequency ◽  
Semiconductor Laser ◽  
Semiconductor Lasers ◽  
Vortex Core ◽  
Strong Influence ◽  
Magnetic Vortex ◽  
Frequency Dependent ◽  
Time Resolved ◽  
Laser Illumination

Abstract Frequency dependent resonance of magnetic vortex core gyration in micrometer sized permalloy squares was observed by time-resolved magneto-optical Kerr microscope using pulsed semiconductor lasers as a light source in stroboscopic method. 
Uniform and efficient laser illumination was realized by a speckle reducer consisting of an oscillating multimode optical fiber and a microbending mode scrambler.
The resonance frequency of the same sized permalloy squares showed a non-uniformity of up to 15%, suggesting the flatness of the underlayer have a strong influence to the gyration motion.

scholarly journals Optical Fiber Communications by means of Chaos Generation

2014 ◽  
Vol 7 (1) ◽  
pp. 12
Author(s):  
Babiker A. Rahman Osman ◽  
A. M. Awadelgied ◽  
Kais Al Naimee
Keyword(s):  
Optical Fiber ◽  
Semiconductor Laser ◽  
Semiconductor Lasers ◽  
Laser Diodes ◽  
Single Mode ◽  
Optical Fiber Communications ◽  
Initial Condition ◽  
Fiber Communications ◽  
Laser Model ◽  
Semiconductor Laser Diodes

The Chaos in the single-mode semiconductor lasers is generated by means of an optoelectronic feedback. Chaotic been generation under selected experimental initial condition of semiconductor laser model with optoelectronics feedback under appropriate conditions. MATLAB packages using to simulate the model behavior of semiconductor laser diodes with optoelectronics feedback. The Chaos in the single-mode semiconductor lasers is generated by means of an optoelectronic feedback. And result generated due to the simulated models. The existence of slow chaotic spiking sequences in the dynamics of a semiconductor laser with an optoelectronic feedback demonstrated experimentally and theoretically.

Phase diagram for magnetic vortex core switching studied by ferromagnetic absorption spectroscopy and time-resolved transmission x-ray microscopy

2013 ◽  
Vol 87 (5) ◽  
Author(s):  
Michael Martens ◽  
Thomas Kamionka ◽  
Markus Weigand ◽  
Hermann Stoll ◽  
Tolek Tyliszczak ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Absorption Spectroscopy ◽  
Vortex Core ◽  
Magnetic Vortex ◽  
Time Resolved ◽  
X Ray

Optical Vibration and Acceleration Sensor With a Silicon Cantilever

1999 ◽  
Author(s):  
Mitsuteru Kimura ◽  
Katsuhisa Toshima ◽  
Harunobu Satoh
Keyword(s):  
Simple Model ◽  
Optical Fiber ◽  
Resonance Frequency ◽  
Acceleration Sensor ◽  
Frequency Range ◽  
Silicon Cantilever ◽  
All Optical ◽  
New Type ◽  
Good Agreement ◽  
Optical Vibration

Abstract A new type all optical vibration and acceleration sensor using the combination of micromachined Si cantilever and optical fiber is proposed, and its fundamental characteristics are demonstrated. The light emitted from bulb-lens set into the V-groove is reflected at the reflector formed on the Si cantilever and then recoupled into the bulb-lens. Several sensors with different length (0.64–6.0 mm long) of the Si cantilever are fabricated to compare the theoretical resonance frequency fr obtained from the simple model and experimental ones. They had good agreement. From the sensing principle the sensing frequency range of the vibration is suitable below the fr of the Si cantilever of the sensor.

Observation of Defect-Assisted Magnetic Vortex Core Reversal at Ultralow Critical Velocity

2021 ◽  
Vol 16 (3) ◽  
Author(s):  
Mahdi Mehrnia ◽  
Jeremy Trimble ◽  
Olle Heinonen ◽  
Jesse Berezovsky
Keyword(s):  
Critical Velocity ◽  
Vortex Core ◽  
Magnetic Vortex
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