Single-Domain Circular Nanomagnets

Cowburn, R. P.; Koltsov, Denis; Adeyeye, A. O.; Welland, Mark E.; Tricker, David

doi:10.1103/physrevlett.83.1042

Cited by 1,168 publications

(840 citation statements)

References 16 publications

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“…al. [11]. These authors reported on the magnetic properties of arrays of nanomagnets made of Supermal-loy, each nanomagnet being a thin circular disk of radius R, and found that for R ∼ 50 − 100nm the magnetic state of each nanomagnet is a single domain one, with the magnetization parallel to the disk plane, and that the magnetization can be reoriented by small applied fields.…”

Section: Introductionmentioning

confidence: 99%

Tunable ratchet effects for vortices pinned by periodic magnetic dipole arrays

Carneiro

2005

Physica C: Superconductivity

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The ratchet effect is demonstrated theoretically for the simple model of a vortex in a thin superconducting film interacting with a periodic array of magnetic dipoles placed in the vicinity of the film . The pinning potential for the vortex is calculated in the London limit and found to break spatial inversion symmetry and to depend on the orientation of the magnetic dipole moments. The motion of the vortex at zero temperature driven by a force oscillating periodically in time is investigated numerically. Drift vortex motion consisting of displacements by a translation vector of the dipole array during each period of oscillation is obtained and studied in detail. The direction of drift differs in general from that of the driving force, except if the driving force oscillates in a direction of high symmetry of the dipole array. The vortex drift velocity depends on the orientation of the magnetic moments, and can be tuned by rotating the dipoles. It is pointed out that if the magnetic moments are free to rotate, the ratchet effect can be produced and tuned by a magnetic field applied parallel to the film surfaces.

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Section: Introductionmentioning

confidence: 99%

Tunable ratchet effects for vortices pinned by periodic magnetic dipole arrays

Carneiro

2005

Physica C: Superconductivity

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“…[10,11,12] Recent studies on such structures have been carried out with the aim of determining the stable magnetized state as a function of the geometry of the particles. [3,4,13,14,15,16] In the case of cylindrical particles, three idealized characteristic configurations have been identified: ferromagnetic with the magnetization parallel to the basis of the cylinder, ferromagnetic with the magnetization parallel to the cylinder axis, and a vortex state in which most of the magnetic moments lie parallel to the basis of the cylinder. The occurrence of each of these configurations depends on geometrical factors, such as the linear dimensions and their aspect ratio τ ≡ H/R, with H the height and R the radius of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

“…Common structures are arrays of wires, [1,2] cylinders, [3,4] rings, [5,6] and tubes. [7,8] Such structures can be tailored to display different stable magnetized states, depending on their geometric details.…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence of each of these configurations depends on geometrical factors, such as the linear dimensions and their aspect ratio τ ≡ H/R, with H the height and R the radius of the cylinder. [3,4,13,14] Another issue to be considered is the interaction between particles. In this case the interparticle distance, D, is the important parameter.…”

Section: Introductionmentioning

confidence: 99%

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Vortex core size in interacting cylindrical nanodot arrays

et al. 2007

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The effect of dipolar interactions among cylindrical nanodots, with a vortex-core magnetic configuration, is analyzed by means of analytical calculations. The cylinders are placed in a N × N square array in two configurations -cores oriented parallel to each other and with antiparallel alignment between nearest neighbors. Results comprise the variation in the core radius with the number of interacting dots, the distance between them and dot height. The dipolar interdot coupling leads to a decrease (increase) of the core radius for parallel (antiparallel) arrays.

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“…From the theoretical point of view, it has been shown that skyrmions can be created by constrictions in helical magnets [5] and their width and chirality can be controlled by spin polarized currents [6]. Magnetic vortices consist of a spin closure texture that can appear as the magnetization groundstate of circular nanomagnets [7,8]. The control of the polarity and chirality of vortices as well as their pinning mechanisms have been intensively studied (See for example Refs.…”

Section: Introductionmentioning

confidence: 99%

Topological magnetic solitons on a paraboloidal shell

Vilas-Boas¹,

Elías²,

Altbir³

et al. 2015

Physics Letters A

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We study the influence of curvature on the exchange energy of skyrmions and vortices on a paraboloidal surface. It is shown that such structures appear as excitations of the Heisenberg model, presenting topological stability, unlike what happens on other simply-connected geometries such as pseudospheres. We also show that the skyrmion width depends on the geometrical parameters of the paraboloid. The presence of a magnetic field leads to the appearance of 2π-skyrmions, introducing a new characteristic length into the system. Regarding vortices, the geometrical parameters of the paraboloid play an important role in the exchange energy of this excitation.

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Single-Domain Circular Nanomagnets

Cited by 1,168 publications

References 16 publications

Tunable ratchet effects for vortices pinned by periodic magnetic dipole arrays

Tunable ratchet effects for vortices pinned by periodic magnetic dipole arrays

Vortex core size in interacting cylindrical nanodot arrays

Topological magnetic solitons on a paraboloidal shell

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