A micro-structured ion-implanted magnonic crystal

Obry, Björn; Pirro, Philipp; Brächer, Thomas; Chumak, A. V.; Osten, Julia; Ciubotaru, Florin; Serga, Alexander A.; Faßbender, J.; Hillebrands, B.

doi:10.1063/1.4807721

Cited by 85 publications

(74 citation statements)

References 25 publications

(28 reference statements)

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“…Analog to photonic crystals, the resulting structures are referred to as magnonic crystals [84][85][86][87][88]. The periodic variations in a magnonic crystal leads to the formation of band gaps in the spin-wave transmission spectrum caused by Bragg reflection.…”

Section: Examplesmentioning

confidence: 99%

“…One example of a magnonic crystal based on the variation of the saturation magnetization in a spin-wave waveguide is illustrated in Figure 7C taken from Obry et al [84]. In this study the implantation of Cr + ions was used to achieve a periodic modulation of the saturation magnetization in a Ni 81 Fe 19 stripe without actually changing the topography, i.e., without altering the thickness of the magnetic material [89,90].…”

Section: Examplesmentioning

confidence: 99%

“…These variations can be induced via either the material parameterslike the saturation magnetization-or via the geometry of the [83]. (C) Band gaps in the spin-wave spectrum of a nano-structured magnonic crystal as a function of the magnetic field, taken from Obry et al [84].…”

Section: Examplesmentioning

confidence: 99%

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Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

et al. 2015

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Spin waves are the elementary excitations of the spin system in a magnetically ordered material state and magnons are their quasi particles. In the following article, we will discuss Brillouin light scattering (BLS) spectroscopy which is now a well-established tool for the characterization of spin waves. BLS is the inelastic scattering of light from spin waves and confers several benefits: the ability to map the spin-wave intensity with spatial resolution and high sensitivity as well as the potential for the simultaneous detection of frequency and wave vector. For several decades, the field of spin waves gained huge interest by the scientific community due to its relevance regarding fundamental issues in spin dynamics. Recently, the ongoing research in the field of magnonics has put particular emphasis on the high potential of spin waves regarding information technology. Opposed to charge-based schemes in conventional electronics and spintronics, magnons are charge-free currents of angular momentum, and, therefore, less subject to dissipative scattering processes. These ideas have propelled the quest for concepts to guide and manipulate spin-wave transport as well as for the miniaturization of spin-wave conduits towards sub-micrometer dimensions. For the further development of potential spin-wave-based devices, the ability to directly observe spin-wave propagation with spatial resolution is crucial. As an optical technique, BLS allows for a sub-micron space resolution by the implementation of a microscope objective in the optical setup. Over the last decade, this micro-focus BLS technique has become an established method for the investigation of spin waves in microstructured magnetic elements and proved its value in particular regarding magnonics. In this article, we will discuss the basic principles of BLS and illustrate the experimental optical setup. Particular emphasis will be put on the implementation of the high spatial resolution of BLS microscopes as well as on their computer based operation and automated sample positioning. Owing to these improvements in ease of use as well as experimental applicability, the BLS technique has maintained its relevance for investigations on spin waves in miniaturized magnetic structures as will be illustrated by a selection of experiments.

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Section: Examplesmentioning

confidence: 99%

Section: Examplesmentioning

confidence: 99%

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Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

et al. 2015

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“…One of the effective ways of tailoring dispersion relation is a periodic modulation of structural or material parameters of the system. The periodicity in magnonic waveguides can be introduced in various ways [23][24][25][26]. The simplest method, used for pattering of planar waveguides, is to introduce a periodic sequence of antidots [27].…”

Section: Introductionmentioning

confidence: 99%

Spin waves in periodic antidot waveguide of complex base

Pan

Kłos

Mieszczak

et al. 2017

J. Phys. D: Appl. Phys.

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We consider the planar magnonic waveguide with a periodic sequence of antidots forming zig-zag pattern, where two neighboring antidots are shifted towards the opposite edges of the waveguide. This system has a complex base with two antidots in one unit cell. The Brillouin zone is here two-times narrower than the Brillouin zone for the waveguide without displacement of antidots. We have shown that for dispersion relation folded into narrower Brillouin zone, new frequency gap can be opened and their width can be controlled by the shift of the antidots. We found that, the different strength of spin wave pinning at the edges of the periodic waveguide (and their antidots) determines the dependence of the width of gap on the shift of antidots. For the systems with completely free or ideally pinned magnetization, these dependencies are qualitatively different. We have found an optimum shift of antidot for maximzing the width of the gap for the system with pinned magnetization. More interestingly, we notice that for this kind of geometry of the structure, majority of the modes are doubly degenerate at the edge of Brillouin zone and have a finite group velocity at the very close vicinity of the edge of Brillouin zone, for larger values of antidot shift. This empowers us to design magnonic waveguide to steer the spin waves.

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“…45 Currently, the magnetic patterning is mainly conducted by ion implantation with the help of several unique devices, including one-way domain wall motion shift registers and magnonic crystals. [46][47] Other magnetic patterning methods have also been proposed with varied working mechanisms, including nano-indentation, local thermal treatment, or local anisotropy modification. [48][49][50] Similar strategies are shared by most of the methods, such as altering the spatial distribution of the effective magnetic anisotropy (Keff), sometimes by changing the saturation magnetization (Ms) during the ion implantation process.…”

Section: Generation Of Magnetic Patternsmentioning

confidence: 99%

High-throughput magnetic patterning with laser direct writing

Zheng¹

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A micro-structured ion-implanted magnonic crystal

Cited by 85 publications

References 25 publications

Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

Spin waves in periodic antidot waveguide of complex base

High-throughput magnetic patterning with laser direct writing

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