Effect of hole shape on spin-wave band structure in one-dimensional magnonic antidot waveguide

Kumar, Dushyant; Sabareesan, P.; Wang, Weiwei; Fangohr, Hans; Barman, Anjan

doi:10.1063/1.4813228

Cited by 34 publications

(23 citation statements)

References 47 publications

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“…The symmetry nodes are not very sharp and possibly overlapping with other modes having the same f but different wave vector k . [ 44 ] Mode E is very similar to the mode profi le observed in a much larger disk observed by Neudecker et al [ 43 ] The mode profi les for s = 100, 150, and 200 nm are available in Figure S3, Supporting Information. When the disks are in the vortex state, both the resonant frequencies and mode profi les are not signifi cantly affected by the variation in s .…”

Section: Vortex State Diskssupporting

confidence: 68%

Direct Detection of Static Dipolar Interaction on a Single Nanodisk Using Microfocused Brillouin Light Scattering Spectroscopy

Shimon

Adeyeye

2015

Adv Elect Materials

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simulations by Dvornik et al. [ 30 ] Recently, Keatley et al. [ 31 ] used a time-resolved scanning Kerr microscopy to isolate the dynamic dipolar interaction between a pair of nominally-shaped disks. However, a detailed scrutiny of phase-resolved Kerr ellipticity data is required to determine the dynamic dipolar coupling strength versus edge-to-edge spacing/diameter ( s/d ) ratio. The effect of dipolar coupling was also found to be inadvertently enhanced due to their fabrication process.It is essential to perform a systematic investigation on the effect of increasing neighboring static dipolar (henceforth: dipolar) fi eld on a single disk using a precise and straightforward technique. In this paper, we have used a microfocused Brillouin light scattering (BLS) setup [ 32 ] to selectively probe the modifi cation in the dynamic behavior of a single disk as a function of increasing dipolar interaction from a neighboring disk. Using pairs of identical disks with varying s , a direct detection of increasing neighboring dipolar fi eld on a single disk is systematically performed. The infl uence of neighboring dipolar fi eld in modifying the dynamic behavior of the resonant spin waves (SWs) mode is evident in the measured spectra and the 2D mode profi les. In addition, by changing the relative orientation between the inter-disk coupling direction and the applied magnetic fi eld ( H app ) to be either parallel or perpendicular, different modes of dipolar interaction can be further distinguished. A method for direct probing of dipolar fi eld presented in this paper will be especially useful for further development in spintronics, magnonics, and magnetoelectronic devices incorporating closely packed magnetic elements. In addition, an understanding on how dynamic modes profi le can be modifi ed by neighboring dipolar interaction is helpful to further control the dynamic dipolar interaction and the corresponding collective excitation. Results and Discussions Power Linearity TestPrior to any detailed investigations of the effect of dipolar interaction on a single disk, a preliminary test for microwave power linearity was carried out by sweeping the rf excitation

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Section: Vortex State Diskssupporting

confidence: 68%

Direct Detection of Static Dipolar Interaction on a Single Nanodisk Using Microfocused Brillouin Light Scattering Spectroscopy

Shimon

Adeyeye

2015

Adv Elect Materials

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“…We have shown here with an analytical model and also in the previous papers (Refs. 38, 42, and 43), that the detailed shape of antidots and random defects do not play significant roles in effects studied in the manuscript. Our results can be crucial for practical realization of SW waveguides for magnonic applications in high frequencies, because precise mirror symmetry is difficult to achieve on such small scales, leading to deviations form the ideal structure.…”

Section: Discussionmentioning

confidence: 95%

Magnonic Band Engineering by Intrinsic and Extrinsic Mirror Symmetry Breaking in Antidot Spin-Wave Waveguides

Kłos

Kumar

Krawczyk

et al. 2013

Sci Rep

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We theoretically study the spin-wave spectra in magnonic waveguides periodically patterned with nanoscale square antidots. We show that structural changes breaking the mirror symmetry of the waveguide can close the magnonic bandgap. The effect of these intrinsic symmetry breaking can be compensated by adjusted asymmetric external bias magnetic field, i.e., by an extrinsic factor. This allows for the recovery of the magnonic bandgaps. The described methods can be used for developing parallel models for recovering bandgaps closed due to a fabrication defect. The model developed here is particular to magnonics, an emerging field combining spin dynamics and spintronics. However, the underlying principle of this development is squarely based upon the translational and mirror symmetries, thus, we believe that this idea of correcting an intrinsic defect by extrinsic means, should be applicable to spin-waves in both exchange and dipolar interaction regimes, as well as to other waves in general.

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“…In order to determine character of the modes and to visualize the spatial distribution of the dynamic magnetization component δm z , we follow the procedure described in Ref. [38]. We perform 2DFT on m z for each value of y seperately.…”

mentioning

confidence: 99%

Collective dynamical skyrmion excitations in a magnonic crystal

et al. 2016

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We investigate theoretically skyrmion magnonic crystal, i.e., the dynamics of the magnetization in a chain of the ferromagnetic nanodots being in skyrmion magnetic configuration. We show that collective excitations are possible to be observed in the structure. We present the dispersion relation of the coupled skyrmions. It exhibit a periodical property in dependence on wave vector, characteristic feature of the band structure in magnonic crystals. Spatial analysis of the magnetization amplitude associated with the magnonic bands confirms type of the excited modes, as breathing and clockwise gyrotropic dynamical skyrmions. These high and low frequency excitations, propagate with negative and positive group velocity, respectively, and can be explored for study fundamental properties and technological applications in spintronics and magnonics.

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Effect of hole shape on spin-wave band structure in one-dimensional magnonic antidot waveguide

Cited by 34 publications

References 47 publications

Direct Detection of Static Dipolar Interaction on a Single Nanodisk Using Microfocused Brillouin Light Scattering Spectroscopy

Direct Detection of Static Dipolar Interaction on a Single Nanodisk Using Microfocused Brillouin Light Scattering Spectroscopy

Magnonic Band Engineering by Intrinsic and Extrinsic Mirror Symmetry Breaking in Antidot Spin-Wave Waveguides

Collective dynamical skyrmion excitations in a magnonic crystal

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