Laboratory studies of magnetic vortices. II. Helicity reversal during reflection of a magnetic vortex at a conducting boundary

1999 ◽  
Vol 6 (8) ◽  
pp. 3217-3225 ◽  
Author(s):  
R. L. Stenzel ◽  
J. M. Urrutia ◽  
M. C. Griskey
Keyword(s):  
Magnetic Vortex ◽  
Laboratory Studies ◽  
Magnetic Vortices

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.

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.

scholarly journals Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Li Ern Chern ◽  
Finn Lasse Buessen ◽  
Yong Baek Kim
Keyword(s):  
Liquid State ◽  
Magnetic Order ◽  
Hall Conductivity ◽  
Magnetic Vortex ◽  
Spin Excitation ◽  
Frustrated Magnets ◽  
Magnetic Vortices ◽  
Vortex Liquid ◽  
Out Of Plane ◽  
Inhomogeneous Spin

AbstractRecently, the observation of large thermal Hall conductivities in correlated insulators with no apparent broken symmetry has generated immense interest and debates on the underlying ground states. Here, considering frustrated magnets with bond-dependent interactions, which are realized in the so-called Kitaev materials, we theoretically demonstrate that a large thermal Hall conductivity can originate from a classical ground state without any magnetic order. We discover a liquid state of magnetic vortices, which are inhomogeneous spin textures embedded in the background of polarized spins, under out-of-plane magnetic fields. In the classical regime, different configurations of vortices form an effectively degenerate manifold. We study the static and dynamical properties of the magnetic vortex liquid state at zero and finite temperatures. In particular, we show that the spin excitation spectrum resembles a continuum of nearly flat Chern bands, which ultimately leads to a large thermal Hall conductivity. Possible connections to experiments are discussed.

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