Effects of antidot shape on the spin wave spectra of two-dimensional Ni80Fe20 antidot lattices

Mandal, Ruma; Laha, Pinaki; Das, Kaustuv; Saha, Susmita; Barman, Saswati; Raychaudhuri, A. K.; Barman, Anjan

doi:10.1063/1.4860959

Cited by 41 publications

(33 citation statements)

References 27 publications

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“…On the other hand, for data storage and memory devices higher damping aids suppression of the magnetization precession during writing. Currently, to achieve control over spin waves 4 lithographic patterning of magnonic crystals 5 6 7 8 was introduced, while for magnetic domain wall devices the behavior has been controlled by the lithographically defined shape 9 of nanowire structures and anisotropy 10 has been introduced by patterning magnetic films. Such patterning requires complicated nanofabrication methods, which, on a smaller scale may introduce defects that significantly affect the magnetic behaviour.…”

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confidence: 99%

Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures

Ganguly

Azzawi

Saha

et al. 2015

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Interface modification for control of ultrafast magnetic properties using low-dose focused ion beam irradiation is demonstrated for bilayers of two technologically important materials: Ni81Fe19 and Pt. Magnetization dynamics were studied using an all-optical time-resolved magneto-optical Kerr microscopy method. Magnetization relaxation, precession, damping and the spatial coherence of magnetization dynamics were studied. Magnetization precession was fitted with a single-mode damped sinusoid to extract the Gilbert damping parameter. A systematic study of the damping parameter and frequency as a function of irradiation dose varying from 0 to 3.3 pC/μm2 shows a complex dependence upon ion beam dose. This is interpreted in terms of both intrinsic effects and extrinsic two-magnon scattering effects resulting from the expansion of the interfacial region and the creation of a compositionally graded alloy. The results suggest a new direction for the control of precessional magnetization dynamics, and open the opportunity to optimize high-speed magnetic devices.

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confidence: 99%

Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures

Ganguly

Azzawi

Saha

et al. 2015

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“…Previous reports on such structures have considered zero magnetocrystalline anisotropy for the constituent films. [31,32] However, in our study both cubic and uniaxial anisotropies along with the shape anisotropy play important roles in determining the total anisotropy in the antidot samples. In CA and SA, the symmetric structure of the holes does not lead to any additional shape anisotropy along with the anisotropy of the parent thin film.…”

Section: Resultsmentioning

confidence: 77%

“…The remarkable difference in the mode profile between the different antidots arises due to the difference in their internal field distribution which leads to formation of extended and localized modes. [31] Additionally, asymmetry introduced from the fabrication process imposes further differences in the internal field profiles in the antidot arrays. Nevertheless, we have tried to address this issue by considering roundish edges during simulations (see insets of figure 4 (f) -(h)) for square, triangular, and diamond shaped antidots (SA, TA, and DA).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, there are few reports on antidot arrays with the anisotropic structures like triangular and diamond shaped holes which may significantly modify the internal field distribution in the vicinity of the holes leading to further modifications of the SW spectra of such systems. [16,31,32] In this present work we have chosen Co 2 Fe 0.4 Mn 0.6 Si (CFMS) thin films and their antidot arrays for the investigation of SW dynamics. To the best of our knowledge, there are no reports yet for the study of magnetization dynamics in antidot arrays of similar materials.…”

Section: Introductionmentioning

confidence: 99%

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Tunability of Domain Structure and Magnonic Spectra in Antidot Arrays of Heusler Alloy

et al. 2019

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Materials suitable for magnonic crystals demand low magnetic damping and long spin wave (SW) propagation distance. In this context Co based Heusler compounds are ideal candidates for magnonic based applications. In this work, antidot arrays (with different shapes) of epitaxial Co2Fe0.4Mn0.6Si (CFMS) Heusler alloy thin films have been prepared using e-beam lithography and sputtering technique. Magneto-optic Kerr effect and ferromagnetic resonance analysis have confirmed the presence of dominant cubic and moderate uniaxial magnetic anisotropies in the thin films. Domain imaging via x-ray photoemission electron microscopy on the antidot arrays reveals chain like switching or correlated bigger domains for different shape of the antidots. Time-resolved MOKE microscopy has been performed to study the precessional dynamics and magnonic modes of the antidots with different shapes. We show that the optically induced spin-wave spectra in such antidot arrays can be tuned by changing the shape of the holes. The variation in internal field profiles, pinning energy barrier, and anisotropy modifies the spin-wave spectra dramatically within the antidot arrays with different shapes. We further show that by combining the magnetocrystalline anisotropy with the shape anisotropy, an extra degree of freedom can be achieved to control the magnonic modes in such antidot lattices. arXiv:1907.02746v1 [cond-mat.mtrl-sci]

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“…Changes of dot or antidot shape, their rotation with respect to the crystallographic axes, imperfections in their shape or at their edges can further modify SW spectra 35,36,37 . Thus, the large variety of shapes for dots or antidots and of their arrangements together with magnetic configurations which can be realized in MCs 38,39,40,41 , makes magnonics an inexhaustible and intriguing topic of research. More specifically, no enough attention has been given to the study of collective dynamics in bi-component MCs where a non-magnetic spacer separates the two magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave dynamics in permalloy/cobalt magnonic crystals in the presence of a nonmagnetic spacer

et al. 2015

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In this paper, we theoretically study the influence of a non-magnetic spacer between ferromagnetic dots and ferromagnetic matrix on the frequency dispersion of the spin wave excitations in twodimensional bi-component magnonic crystals. By means of the dynamical matrix method we investigate structures inhomogeneous across the thickness represented by square arrays of Cobalt or Permalloy dots in a Permalloy matrix. We show that the introduction of a non-magnetic spacer significantly modifies the total internal magnetic field especially at the edges of the grooves and dots. This permits the manipulation of the magnonic band structure of spin waves localized either at the edges of the dots or in matrix material at the edges of grooves. According to the micromagnetic simulations two types of end modes were found. The corresponding frequencies are significantly influenced by the end modes localization region. We also show that, with the use of a single ferromagnetic material, it is possible to design a magnonic crystal preserving properties of bicomponent magnonic crystals and magnonic antidot lattices. Finally, the influence of the nonmagnetic spacers on the technologically relevant parameters like group velocity and magnonic band width are discussed.

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Effects of antidot shape on the spin wave spectra of two-dimensional Ni80Fe20 antidot lattices

Cited by 41 publications

References 27 publications

Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures

Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures

Tunability of Domain Structure and Magnonic Spectra in Antidot Arrays of Heusler Alloy

Spin-wave dynamics in permalloy/cobalt magnonic crystals in the presence of a nonmagnetic spacer

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