2011
DOI: 10.1103/physrevlett.106.137201
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Coupled Vortex Oscillations in Spatially Separated Permalloy Squares

Abstract: The influence of the magnetostatic interaction on vortex dynamics in arrays of ferromagnetic disks is investigated by means of a broadband ferromagnetic-resonance setup. Transmission spectra reveal a strong dependence of the resonance frequency of vortex-core motion on the ratio between the center-tocenter distance and the element size. For a decreasing ratio, a considerable broadening of the absorption peak is observed following an inverse sixth power law. An analogy between the vortex system and rotating dip… Show more

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Cited by 68 publications
(61 citation statements)
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“…1,2 Because both circularity and polarity can be specified by two independent values, that is, c = ± 1 and p = ± 1, four distinct spin states can exist in a single magnetic element with the combination of circularity and polarity. Magnetic vortices have been intensively studied due to their compelling physical behavior [3][4][5][6][7] and their potential in a wide range of applications such as data storage, 8,9 signal transfer, [10][11][12] logic devices, 13 transistors 14 and artificial skyrmion crystals. [15][16][17][18] With respect to practical application of magnetic vortices in advanced nanotechnologies, one of the critical factors is the effective reconfigurability of two topologies, c and p, particularly within large and densely packed arrays of magnetic elements.…”
Section: Introductionmentioning
confidence: 99%
“…1,2 Because both circularity and polarity can be specified by two independent values, that is, c = ± 1 and p = ± 1, four distinct spin states can exist in a single magnetic element with the combination of circularity and polarity. Magnetic vortices have been intensively studied due to their compelling physical behavior [3][4][5][6][7] and their potential in a wide range of applications such as data storage, 8,9 signal transfer, [10][11][12] logic devices, 13 transistors 14 and artificial skyrmion crystals. [15][16][17][18] With respect to practical application of magnetic vortices in advanced nanotechnologies, one of the critical factors is the effective reconfigurability of two topologies, c and p, particularly within large and densely packed arrays of magnetic elements.…”
Section: Introductionmentioning
confidence: 99%
“…These interactions can modify existing resonant behavior [1,2], lead to the appearance of new coupled modes [3][4][5], or result in a combination of these [6][7][8]. The coupling of DWs has also been proposed as a scheme towards increasing the output power of spin-torque oscillators [9], and will have an impact on the design of DW-logic-based devices as well.…”
mentioning
confidence: 99%
“…A very challenging variation is near-field Brillouin scattering, which has been used to image edge mode dynamics with resolution below 55 nm [17]. X-ray microscopy based on magnetic circular dichroism also provides dynamic magnetic imaging [18][19][20] with resolution as fine as 25 nm. [18] In parallel, ferromagnetic resonance force microscopy (FMRFM) [21][22][23][24] has been developed and proven to be a useful tool for various areas in magnetic dynamics, such as spin wave dynamics in confined structures [22,[25][26][27][28][29][30], spin-transfer torque device dynamics [31], defect detection in an array [32], and spin wave localization [33][34][35][36].…”
mentioning
confidence: 99%