Magnetic skyrmions generation and control in FePt nanoparticles through shape and magnetocrystalline anisotropy variation: a FEM micromagnetic simulation study

2021 ◽  
Author(s):  
Vasileios D. Stavrou ◽  
Leonidas N. Gergidis
Keyword(s):  
Simulation Study ◽  
Magnetocrystalline Anisotropy ◽  
Micromagnetic Simulation ◽  
Fept Nanoparticles ◽  
Magnetic Skyrmions ◽  
And Control

Magnetic skyrmions in FePt nanoparticles having Reuleaux 3D geometry: a micromagnetic simulation study

Nanoscale ◽  
2019 ◽  
Vol 11 (42) ◽  
pp. 20102-20114 ◽  
Author(s):  
Vasileios D. Stavrou ◽  
Drosos Kourounis ◽  
Konstantinos Dimakopoulos ◽  
Ioannis Panagiotopoulos ◽  
Leonidas N. Gergidis
Keyword(s):  
Finite Element ◽  
Simulation Study ◽  
Magnetization Reversal ◽  
Magnetocrystalline Anisotropy ◽  
Micromagnetic Simulation ◽  
Fept Nanoparticles ◽  
External Fields ◽  
Micromagnetic Simulations ◽  
3D Geometry ◽  
Magnetic Skyrmions

The magnetization reversal in magnetic FePt nanoelements having Reuleaux 3D geometry is studied using Finite Element micromagnetic simulations. Multiple skyrmions are formed for a range of external fields and magnetocrystalline anisotropy values.

Design and control of cooperative ball juggling DELTA robots without visual guidance

Robotica ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 384-400 ◽  
Author(s):  
Zeeshan Shareef ◽  
Viktor Just ◽  
Heinrich Teichrieb ◽  
Ansgar Trächtler
Keyword(s):  
Visual System ◽  
Simulation Study ◽  
Autonomous Robots ◽  
Vital Role ◽  
Control Loop ◽  
Visual Guidance ◽  
Computationally Expensive ◽  
The Stability ◽  
And Control

SUMMARYCooperative ball juggling is one of the most difficult tasks when performed through autonomous robots. States of the ball (position and velocity) play a vital role for the stability and duration of a long rally. Cameras are normally used in ball juggling to calculate these parameters, the use of which is not only computationally expensive but also requires a lot of hardware to determine. In this paper, we propose a control loop for cooperative ball juggling using parallel DELTA robots without visual guidance. In contrast to using a visual system for ball states feedback, an observer based on the reflection laws is designed to calculate the continuous position and velocity of the ball during juggling. Besides the conventional controller blocks, the proposed control loop consists of the ball prediction and the plate striking movement generation blocks. Two controllers are designed for the stability and tracking of variable reference height of the ball during juggling: One controller calculates the velocity of the striking plate to achieve the reference height of the ball during juggling and the second controls the actuator angles. A simulation study and hardware experiments show applicability of the designed observer and validation of the proposed control loop.

Sign in / Sign up

Export Citation Format

Share Document