Magnetic vortex nucleation and annihilation in bi-stable ultra-small ferromagnetic particles

Nanoscale ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 2587-2595
Author(s):  
M. J. Martínez-Pérez ◽  
B. Müller ◽  
J. Lin ◽  
L. A. Rodriguez ◽  
E. Snoeck ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Temporal Stability ◽  
Magnetic Vortex ◽  
Magnetic Vortices ◽  
Full Picture ◽  
Ferromagnetic Particles ◽  
Vortex Nucleation

We nucleate and manipulate magnetic vortices in ultrasmall magnetic nanoparticles and provide the full picture of their thermal and temporal stability.

QUANTUM MAGNETIC VORTICES AT FINITE TEMPERATURE IN (3 + 1)-D

2000 ◽  
Vol 15 (11n12) ◽  
pp. 731-735
Author(s):  
E. C. MARINO ◽  
D. G. G. SASAKI
Keyword(s):  
Correlation Function ◽  
Correlation Functions ◽  
Large Distance ◽  
Finite Temperature ◽  
Higgs Model ◽  
Magnetic Vortex ◽  
Zero Temperature ◽  
Magnetic Vortices ◽  
Vortex Lines ◽  
Distance Behavior

We study the effect of a finite temperature on the correlation function of quantum magnetic vortex lines in the framework of the (3 + 1)-dimensional Abelian Higgs model. The vortex energy is inferred from the large distance behavior of these correlation functions. For large straight vortices of length L, we obtain that the energy is proportional to TL2 differently from the zero temperature result which is proportional to L. The case of closed strings is also analyzed. For T = 0, we evaluate the correlation function and energy of a large ring. Finite closed vortices do not exist as genuine excitations for any temperature.

Stability of Larger Ferromagnetic Chain-of-sphere Nanostructure Comprising Magnetic Vortices

2008 ◽  
Vol 1071 ◽  
Author(s):  
Prabeer Barpanda
Keyword(s):  
Magnetic Properties ◽  
Micromagnetic Simulation ◽  
Magnetic Vortex ◽  
Inversion Symmetry ◽  
Uniform Size ◽  
Magnetic Vortices ◽  
Large Size ◽  
Reversal Process ◽  
Ferromagnetic Chain ◽  
Magnetization Reversal Process

AbstractChain-of-sphere (CoS) nanostructure containing Permalloy (Fe20Ni80) nanospheres of uniform size (d=50 nm) has been studied using micromagnetic simulation. These large-size Permalloy nanospheres support magnetic vortex structure upon relaxation. The presence of magnetic vortices in CoS architecture affects its magnetic properties significantly. Micromagnetic behaviour of Permalloy CoS system was studied focusing on the magnetization reversal process. The presence of magnetic vortices triggers a vortex creation and annihilation mechanism (VCA) involving the formation and breaking of an inversion symmetry (IS) feature. This VCA mechanism has been studied using 3D micromagnetic simulation and results of coercivity and vortex parameters are presented.

scholarly journals Polarizability of electrically induced magnetic vortex “atoms”

2018 ◽  
Vol 185 ◽  
pp. 07003
Author(s):  
P.I. Karpov ◽  
S.I. Mukhin
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Domain Walls ◽  
Topological Defects ◽  
Magnetic Vortex ◽  
Distribution Profile ◽  
Magnetic Structures ◽  
Magnetic Vortices ◽  
Vortex Density ◽  
Magnetoelectric Materials

Electric field control of magnetic structures, particularly topological defects in magnetoelectric materials, draws a great attention, which has led to experimental success in creation and manipulation of single magnetic defects, such as skyrmions and domain walls. In this work we explore a scenario of electric field creation of another type of topological defects – magnetic vortices and antivortices. Because of interaction of magnetic and electric subsystems each magnetic vortex (antivortex) in magnetoelectric materials possesses quantized magnetic charge, responsible for interaction between vortices, and electric charge that couples them to electric field. This property of magnetic vortices makes possible their creation by electric fields. We show that the electric field, created by a cantilever tip, produces a “magnetic atom” with a localized spot of ordered vortices (“nucleus” of the atom) surrounded by antivortices (“electronic shells”). We analytically find the vortex density distribution profile and temperature dependence of polarizability of this structure and confirm it numerically by Monte Carlo simulation.

To the Theory of Hyperthermia Effect Induced by Magnetic Nanoparticles

2015 ◽  
Vol 233-234 ◽  
pp. 771-775 ◽  
Author(s):  
Andrey Zubarev ◽  
Ali Abu-Bakr
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Heat Production ◽  
Particle Rotation ◽  
Carrier Liquid ◽  
Linearly Polarized ◽  
Dilute Suspension ◽  
Oscillating Magnetic Field ◽  
Ferromagnetic Particles

In this paper, we present results of theoretical modeling of the rise of temperature for the unit of time in a dilute suspension of the fiber ferromagnetic particles under the action of the linearly polarized oscillating magnetic field. Two mechanisms of the heat production, namely the particle rotation in the liquid and its internal remagnetization are considered. We study effect of the particle shape, its magnetic properties and rheological properties of the carrier liquid on the rise of temperature for the unit of time by the particles.

Energy barrier to magnetic vortex nucleation

2006 ◽  
Vol 88 (1) ◽  
pp. 012508 ◽  
Author(s):  
J. W. Lau ◽  
J. K. Bording ◽  
M. Beleggia ◽  
Y. Zhu
Keyword(s):  
Energy Barrier ◽  
Magnetic Vortex ◽  
Vortex Nucleation

scholarly journals Magnetic vortex nucleation modes in static magnetic fields

AIP Advances ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 105103
Author(s):  
Marek Vaňatka ◽  
Michal Urbánek ◽  
Roman Jíra ◽  
Lukáš Flajšman ◽  
Meena Dhankhar ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Magnetic Vortex ◽  
Static Magnetic Fields ◽  
Vortex Nucleation
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