Magnetic Vortex Dynamics

Antoš, Roman; Otani, Y.; Shibata, Junya

doi:10.1143/jpsj.77.031004

Cited by 81 publications

(57 citation statements)

References 112 publications

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“…In the last years, the dynamics of vortices have been studied intensely [4]- [7]. Vortices appear in thin-film disks when a curling magnetization pointing in-plane and along the edges is energetically favorable.…”

Section: Introductionmentioning

confidence: 99%

Finite Size Effect on Spread of Resonance Frequencies in Arrays of Coupled Vortices

Vogel

Drews²,

et al. 2011

IEEE Trans. Magn.

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Dynamical properties of magnetic vortices in arrays of magnetostatically coupled ferromagnetic disks are studied by means of a broadband ferromagnetic-resonance (FMR) setup. Magnetic force microscopy and magnetic transmission soft X-ray microscopy are used to image the core polarizations and the chiralities which are both found to be randomly distributed. The resonance frequency of vortex-core motion strongly depends on the magnetostatic coupling between the disks. The parameter describing the relative broadening of the absorption peak observed in the FMR transmission spectra for a given normalized center-to-center distance between the elements is shown to depend on the size of the array.

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Section: Introductionmentioning

confidence: 99%

Finite Size Effect on Spread of Resonance Frequencies in Arrays of Coupled Vortices

Vogel

Drews²,

et al. 2011

IEEE Trans. Magn.

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“…In this article, we use NV-based magnetometry to measure the stray field emanating from magnetic vortices in nanostructured ferromagnetic thin films. Such structures, which are of great interest both for fundamental studies in nanomagnetism 15 and for applications such as non-volatile magnetic storage 16,17 and microwave (MW) generation 18 , have been investigated using a wide range of microscopy techniques 2,7,[19][20][21][22] . However, obtaining quantitative information that is directly comparable to theory remains a challenging task.…”

mentioning

confidence: 99%

Stray-field imaging of magnetic vortices with a single diamond spin

et al. 2013

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Despite decades of advances in magnetic imaging, obtaining direct, quantitative information with nanometre scale spatial resolution remains an outstanding challenge. Recently, a technique has emerged that employs a single nitrogen-vacancy defect in diamond as an atomicsize magnetometer, which promises significant advances. However, the effectiveness of the technique when applied to magnetic nanostructures remains to be demonstrated. Here we use a scanning nitrogen-vacancy magnetometer to image a magnetic vortex, which is one of the most iconic objects of nanomagnetism, owing to the small size (B10 nm) of the vortex core. We report three-dimensional, vectorial and quantitative measurements of the stray magnetic field emitted by a vortex in a ferromagnetic square dot, including the detection of the vortex core. We find excellent agreement with micromagnetic simulations, both for regular vortex structures and for higher-order magnetization states. These experiments establish scanning nitrogen-vacancy magnetometry as a practical and unique tool for fundamental studies in nanomagnetism.

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“…Large lateral dimensions may give rise to 2D magnetic textures, such as the so-called vortex state in disks [11]. Such textures are being investigated to design RF oscillator components, relying on the gyrotropic motion of the vortex core driven by a spin-polarized current [12]. Stacking several disks provides additional degrees of freedom to control the precessional modes or the spectrum purity, for instance allowing to consider vortices with cores aligned parallel or antiparallel [13].…”

mentioning

confidence: 99%

Quantitative analysis of shadow x-ray magnetic circular dichroism photoemission electron microscopy

et al. 2015

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Shadow X-ray Magnetic Circular Dichroism Photo-Emission Electron Microscopy (XMCD-PEEM) is a recent technique, in which the photon intensity in the shadow of an object lying on a surface, may be used to gather information about the three-dimensional magnetization texture inside the object. Our purpose here is to lay the basis of a quantitative analysis of this technique. We first discuss the principle and implementation of a method to simulate the contrast expected from an arbitrary micromagnetic state. Text book examples and successful comparison with experiments are then given. Instrumental settings are finally discussed, having an impact on the contrast and spatial resolution : photon energy, microscope extraction voltage and plane of focus, microscope background level, electric-field related distortion of three-dimensional objects, Fresnel diffraction or photon scattering.Progress is continuous in the decreasing size and increasing complexity of nanosized magnetic systems being designed for either fundamental science or devices. Magnetic microscopies are crucial tools to monitor and understand the properties of such systems. Various types of information are desirable to gather, leading to multiple criteria to classify microscopies: spatial and time resolution, compatibility with environmental parameters such as variable temperature and applied magnetic field, requirements on the sample preparation and compatibility for ex-situ processing such as lithography, correlation with structural information, elemental sensitivity, quantity measured (magnetization, induction, stray field etc.), sensitivity. The most common magnetic microscopies offering spatial resolution below 50 nm and direct sensitivity to magnetization are X-ray Magnetic Circular Dichroism PhotoEmission Electron Microscopy (XMCD-PEEM) [ [7][8][9].Yet another criterion is the volume of the sample probed. This criterium is gaining in importance in the context of the emergence of three-dimensional (3D) magnetic objects and textures. The distribution of magnetization may be truly 3D if along the three directions in space the size of a system lies above magnetic characteristic length scales, such as the dipolar exchange length ∆ d for soft magnetic materials, or the anisotropy exchange length ∆ u for a hard magnetic material [10]. While this is obviously fulfilled in macroscopic materials, the complexity of magnetic textures is such that it cannot be measured in detail, and besides it cannot be controlled to achieve specific functions. The progress in nanofabrication techniques now allows to design suitable systems, both with top-down and bottom-up approaches. Let us give some examples. Flat magnetic elements are basic building blocks in spintronics, being patterned with great 2D versatility with thin film and lithography technologies. Large lateral dimensions may give rise to 2D magnetic textures, such as the so-called vortex state in disks [11]. Such textures are being investigated to design RF oscillator components, relying on the gyrotropic motion ...

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Magnetic Vortex Dynamics

Cited by 81 publications

References 112 publications

Finite Size Effect on Spread of Resonance Frequencies in Arrays of Coupled Vortices

Finite Size Effect on Spread of Resonance Frequencies in Arrays of Coupled Vortices

Stray-field imaging of magnetic vortices with a single diamond spin

Quantitative analysis of shadow x-ray magnetic circular dichroism photoemission electron microscopy

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