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.

scholarly journals Воздействие поля зонда магнитно-силового микроскопа на скирмионное состояние в модифицированной пленке Co/Pt с перпендикулярной анизотропией

2019 ◽  
Vol 61 (9) ◽  
pp. 1644
Author(s):  
В.Л. Миронов ◽  
Р.В. Горев ◽  
О.Л. Ермолаева ◽  
Н.С. Гусев ◽  
Ю.В. Петров
Keyword(s):  
Magnetization Reversal ◽  
Magnetic Force ◽  
Ion Beam ◽  
Magnetic Force Microscope ◽  
Local Magnetization ◽  
Probe Field ◽  
Micromagnetic Simulations ◽  
Perpendicular Magnetization ◽  
Magnetic Skyrmions ◽  
Microscope Probe

We present the experimental magnetization reversal of artificial magnetic skyrmions in a Co/Pt multilayer film with perpendicular magnetization by a magnetic force microscope probe. The sample was a Co/Pt film containing an array of cylindrical regions with reduced anisotropy, which were modified by a focused He+ ion beam. The magnetic state of the sample was monitored by magnetic force microscopy. The local magnetization reversal was performed by the field of magnetic force microscope probe passing over the sample at low height. The effects of magnetostatic interaction between the probe field and skyrmion magnetization in these structures are investigated by micromagnetic simulations.

Micromagnetic simulation study of magnetization reversal in torus-shaped permalloy nanorings

2017 ◽  
Vol 31 (22) ◽  
pp. 1750162 ◽  
Author(s):  
Amaresh Chandra Mishra ◽  
R. Giri
Keyword(s):  
Hysteresis Loop ◽  
Simulation Study ◽  
Magnetization Reversal ◽  
Hysteresis Loops ◽  
Vortex State ◽  
Micromagnetic Simulation ◽  
Hysteresis Curve ◽  
Minor Radius ◽  
Maximum Value ◽  
Major Radius

Using micromagnetic simulation, the magnetization reversal of soft permalloy rings of torus shape with major radius R varying within 20–100 nm has been investigated. The minor radius r of the torus rings was increased from 5 nm up to a maximum value r[Formula: see text] such that R- r[Formula: see text] = 10 nm. Micromagnetic simulation of in-plane hysteresis curve of these nanorings revealed that in the case of very thin rings (r [Formula: see text] 10 nm), the remanent state is found to be an onion state, whereas for all other rings, the remanent state is a vortex state. The area of the hysteresis loop was found to be decreasing gradually with the increment of r. The normalized area under the hysteresis loops (A[Formula: see text]) increases initially with increment of r. It attains a maximum for a certain value of r = r0 and again decreases thereafter. This value r0 increases as we decrease R and as a result, this peak feature is hardly visible in the case of smaller rings (rings having small R).

Micromagnetic Simulation of Asymmetrical CoFe Nanorings

2012 ◽  
Vol 538-541 ◽  
pp. 529-533
Author(s):  
Zhen Gang Guo ◽  
Li Qing Pan ◽  
Hong Mei Qiu ◽  
Xue Dan Zhao ◽  
Li Hong Yang
Keyword(s):  
Magnetic Field ◽  
Domain Wall ◽  
Applied Magnetic Field ◽  
Magnetization Reversal ◽  
Vortex State ◽  
Micromagnetic Simulation ◽  
Micromagnetic Simulations ◽  
Vortex States

Domain wall motions and magnetization reversal processes in the nanoscale asymmetrical Co50Fe50rings have been studied using micromagnetic simulations. The results reveal that the switching fields and the plateau width of vortex state can be tuned through changing the asymmetrical parameter of magnetic nanorings. The chirality of vortex states can be easily controlled by the orientation of the applied magnetic field.

Magnetization Reversal in NiFe Nano-triangles

2010 ◽  
Vol 1258 ◽  
Author(s):  
Xinghua Wang ◽  
Sarjoosing Goolaup ◽  
Chunxiao Cong ◽  
wensiang Lew
Keyword(s):  
Thin Film ◽  
Domain Wall ◽  
Magnetization Reversal ◽  
Micromagnetic Simulation ◽  
Lateral Size ◽  
Magnetic Reversal ◽  
Micromagnetic Simulations ◽  
Reversal Mechanism

AbstractWe have fabricated sub-100 nm triangles NiFe triangle arrays using NSL and the MOKE measurement and micromagnetic simulations were carried out to investigate the reversal mechanism of the arrays. Enhancement of coercivity compared to the thin film was observed in all the three arrays but in different degree from the MOKE measurement. With the increase of the lateral size of the triangle, the effect of the coercivity enhancing decreases. Micromagnetic simulation shows that instead of domain wall nucleation and annihilation in the thin film, the reversal mechanism of the 45 and 80 nm triangles is dominated by the coherent rotation. While in the 100 nm triangle, the magnetic reversal takes place via forming and reversing a V like sate.

scholarly journals Micromagnetic Simulations of Fe and Ni Nanodot Arrays Surrounded by Magnetic or Non-Magnetic Matrices

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 349
Author(s):  
Devika Sudsom ◽  
Andrea Ehrmann
Keyword(s):  
Magnetic Materials ◽  
Data Storage ◽  
Magnetization Reversal ◽  
Hysteresis Loops ◽  
Object Oriented ◽  
Basic Research ◽  
Memory Systems ◽  
The Other ◽  
Micromagnetic Simulations ◽  
Nanodot Arrays

Combining clusters of magnetic materials with a matrix of other magnetic materials is very interesting for basic research because new, possibly technologically applicable magnetic properties or magnetization reversal processes may be found. Here we report on different arrays combining iron and nickel, for example, by surrounding circular nanodots of one material with a matrix of the other or by combining iron and nickel nanodots in air. Micromagnetic simulations were performed using the OOMMF (Object Oriented MicroMagnetic Framework). Our results show that magnetization reversal processes are strongly influenced by neighboring nanodots and the magnetic matrix by which the nanodots are surrounded, respectively, which becomes macroscopically visible by several steps along the slopes of the hysteresis loops. Such material combinations allow for preparing quaternary memory systems, and are thus highly relevant for applications in data storage and processing.

Simulation Study on Armor-Piercing Effect of Armor-Piercing Bomb

2013 ◽  
Vol 456 ◽  
pp. 55-59
Author(s):  
Ren Bin Zhou ◽  
Xue Bing Liao ◽  
An Qing Ming ◽  
Yong Feng Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Study ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Analysis Program ◽  
Element Analysis ◽  
Aluminum Target

Studying the armor-piercing effect of armor-piercing bomb that attacks aluminum target is essential, because the target can be considered the simulation of the actual fight equipment. Based on the hypothesis about building the fraction field, the armor-piercing effect of armor-piercing bomb is analyzed, and the velocity and the intruding depth parameter model of armor-piercing effect are established. Taking a certain armor-piercing bomb as example, the intruding processes of armor-piercing effect are simulated by using the nonlinear finite element analysis program LS-DYNA, while aluminum target simulates the wall of combat equipment in two different conditions. At last, the finite element simulated results are given and analyzed that agree with the experiments.

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