Spatially Resolved Dynamics of Localized Spin-Wave Modes in Ferromagnetic Wires

Park, J. P.; Eames, P.; Engebretson, D. M.; Berezovsky, Jesse; Crowell, P. A.

doi:10.1103/physrevlett.89.277201

Cited by 238 publications

(189 citation statements)

References 14 publications

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“…The spin wave eigenmodes of in-plane transversely magnetized thin film ferromagnetic wires can be treated as width eigenmodes 23,24,34,49,50 due to the geometric confinement of the spin wave spectrum in the wire width direction. One particular mode that displays its maximum amplitude at the wire edges is called the edge mode (EM).…”

Section: Methodsmentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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We report experimental and theoretical studies of spin wave eigenmodes in transversely magnetized thin film Permalloy wires. Using broadband ferromagnetic resonance technique, we measure the spectrum of spin wave eigenmodes in individual wires as a function of magnetic field and wire width. Comparison of the experimental data to our analytical model and micromagnetic simulations shows that the intrinsic dipolar edge pinning of spin waves is negligible in transversely magnetized wires. Our data also quantify the degree of extrinsic edge pinning in Permalloy wires. This work establishes the boundary conditions for dynamic magnetization in transversely magnetized thin film wires for the range of wire widths and thicknesses studied, and provides a quantitative description of the spin wave eigenmode frequencies and spatial profiles in this system as a function of the wire width.

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Section: Methodsmentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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“…Magnetization dynamics have been studied in such elements by various techniques. [1][2][3][4][5][6][7] Substantial effort has been made to study magnetization reversal in continuous films and small elements 8,9 but the coherence 10,11 of precessional switching and the origin of the damping 12,13 are the subject of continuing debate. Time-resolved magnetic images 14 show that precessional switching is incoherent even in a permalloy element that initially has uniform magnetization.…”

Section: Introductionmentioning

confidence: 99%

“…The small amplitude precessional motion provides quantitative information about magnetic parameters of physical and technological relevance, and can be used to study the excitation of nonuniform eigenmodes in patterned thin films of nonellipsoidal shape. These eigenmodes have been studied experimentally by Brillouin light scattering, 15 TRSKEM, 3 ferromagnetic resonance, 16,17 and inductive techniques. 13,18 However to fully understand their character it is necessary to determine both their frequency and their spatial character from dynamic images.…”

Section: Introductionmentioning

confidence: 99%

Imaging the dephasing of spin wave modes in a square thin film magnetic element

et al. 2004

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We have used time-resolved scanning Kerr effect microscopy to study dephasing of spin wave modes in a square Ni 81 Fe 19 element of 10 m width and 150 nm thickness. When a static magnetic field H was applied parallel to an edge of the square, demagnetized regions appeared at the edges orthogonal to the field. When H was applied along a diagonal, a demagnetized region appeared along the opposite diagonal. Time-resolved images of the out-of-plane magnetization component showed stripes that lie perpendicular to H and indicate the presence of spin wave modes with wave vector parallel to the static magnetization. The transient Kerr rotation was measured at different positions along an axis parallel to H, and the power spectra revealed a number of different modes. Micromagnetic simulations reproduce both the observed images and the mode frequencies. This study allows us to understand an anisotropic damping observed at the center of the square element in terms of dephasing of the resonant mode spectrum.

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“…[1][2][3][4][5][6][7] Such studies are particularly important in view of the potential application of FM elements in magnetic data storage and microwave devices. [8][9][10][11] In many cases, however, magnetic elements do not stand alone, but are ͑par-tially͒ surrounded by metallic conductors.…”

Section: Introductionmentioning

confidence: 99%

The effect of a neighboring metal layer on the high-frequency characteristics of a thin magnetic stripe

Vroubel

Rejaei

2008

Journal of Applied Physics

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The spin-wave spectrum of a ferromagnetic stripe placed above a metallic layer with finite conductivity is studied by using the magnetostatic Green's function formalism. It is shown that the frequency and linewidth of the resonances are uniquely determined by complex, mode-dependent demagnetization factors. The formalism developed is used to analyze the resonance characteristics of the magnetic stripe as a function of its width and separation from the metallic layer.

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Spatially Resolved Dynamics of Localized Spin-Wave Modes in Ferromagnetic Wires

Cited by 238 publications

References 14 publications

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Imaging the dephasing of spin wave modes in a square thin film magnetic element

The effect of a neighboring metal layer on the high-frequency characteristics of a thin magnetic stripe

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