Spin waves and domain wall modes in curved magnetic nanowires

Bocklage, Lars; Motl-Ziegler, Sandra; Topp, Jesco; Matsuyama, T.; Meier, Guido

doi:10.1088/0953-8984/26/26/266003

Cited by 7 publications

(5 citation statements)

References 50 publications

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“…Studies of these effects such as fieldand current-induced domain wall motion [1][2][3][4][5][6][7] , domain wall magneto-resistance [8][9][10] and the interaction of spin waves with nanoscale spin textures such as domain walls, vortices and skyrmions [11][12][13][14][15][16][17] heavily rely on the understanding of transport and magnetization dynamics in ferromagnetic nanowires. More recently, ferromagnetic nanowires proved to be useful for studies of inverse spin Hall effect 19 and spin orbit torques [20][21][22][23] .…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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“…A vector network analyzer is used to measure the absorption spectrum of the sample as a function of the applied external field and excitation frequency (see Fig. 2 ) 11 . The magnitude of the high frequency magnetic field produced at the location of the permalloy stripe is 12 where b is the width of the stripe and under the assumption that the stripline is a sheet of current.…”

Section: Resultsmentioning

confidence: 99%

Incoherent Nuclear Resonant Scattering from a Standing Spin Wave

Gollwitzer

Bocklage

Schlage

et al. 2018

Sci Rep

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We introduce a method to study the spatial profiles of standing spin waves in ferromagnetic microstructures. The method relies on Nuclear Resonant Scattering of 57Fe using a microfocused beam of synchrotron radiation, the transverse coherence length of which is smaller than the length scale of lateral variations in the magnetization dynamics. Using this experimental method, the nuclear resonant scattering signal due to a confined spin wave is determined on the basis of an incoherent superposition model. From the fits of the Nuclear Resonant Scattering time spectra, the precessional amplitude profile across the stripe predicted by an analytical model is reconstructed. Our results pave the way for studying non-homogeneous dynamic spin configurations in microstructured magnetic systems using nuclear resonant scattering of synchrotron light.

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“…An excitation field was applied in the x direction to determine f trans and in the y direction to determine f twist . Experimentally, this could be achieved using microwave frequency x or y oriented (real or effective) magnetic fields generated by striplines 56 , Oersted fields due to in-plane current injection 57 or tailorable spin torques in magnetoresistive devices 13,[58][59][60][61] . Fourier analysis of the ringdown dynamics at a strip width of 80 nm demonstrated excitation of the translational and breathing modes at f trans = 2.6 ± 0.1 GHz and f breathe = 6.4 ± 0.1 GHz, in good agreement with the eigenmode results (f trans = 2.61 GHz and f breathe = 6.38 GHz for w = 80 nm as per Fig.…”

Section: Discussionmentioning

confidence: 99%

Resonant translational, breathing, and twisting modes of transverse magnetic domain walls pinned at notches

et al. 2016

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We study translational, breathing and twisting resonant modes of transverse magnetic domain walls pinned at notches in ferromagnetic nanostrips. We demonstrate that a mode's sensitivity to notches depends strongly on the characteristics of that particular resonance. For example, the frequencies of modes involving lateral motion of the wall are the ones which are most sensitive to changes in the notch intrusion depth (especially at the narrower, more strongly confined end of the domain wall). In contrast, the breathing mode, whose dynamics are concentrated away from the notches is relatively insensitive to changes in the notches' sizes. We also demonstrate a sharp drop in the translational mode's frequency towards zero when approaching depinning which is found, using a harmonic oscillator model, to be consistent with a reduction in the local slope of the notch-induced confining potential at its edge.

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Spin waves and domain wall modes in curved magnetic nanowires

Cited by 7 publications

References 50 publications

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Incoherent Nuclear Resonant Scattering from a Standing Spin Wave

Resonant translational, breathing, and twisting modes of transverse magnetic domain walls pinned at notches

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