Introducing artificial length scales to tailor magnetic properties

Faßbender, J.; Strache, Thomas; Liedke, Maciej Oskar; Markó, D.; Wintz, Sebastian; Lenz, K.; Keller, Adrian; Facsko, Stefan; Mönch, Ingolf; McCord, Jeffrey

doi:10.1088/1367-2630/11/12/125002

Cited by 87 publications

(55 citation statements)

References 63 publications

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“…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]. In a magnonic crystal the chosen periodicity-1 µm in the actual case-defines the Bragg condition and, thus, the position of the resulting band gaps in terms of the wave vector.…”

Section: Examplesmentioning

confidence: 99%

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%

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

et al. 2015

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“…Since then, the influence of IBS rippled morphologies in the magnetic properties of a deposited thin film has been addressed. For instance, a 9 nm thick permalloy film was deposited by Molecular Beam Epitaxy on IBS rippled silicon surfaces [280]. In this case, a 5 nm thick Cr buffer was also used in order to achieve a perfect replication of the rippled morphology into the metallic film.…”

Section: Applicationsmentioning

confidence: 99%

Self-organized nanopatterning of silicon surfaces by ion beam sputtering

Muñoz-García

Vázquez

Castro

et al. 2014

Materials Science and Engineering: R: Reports

165

201

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“…Therefore a tendency of collective reversal of the stripe pattern is observed. We have also shown the power of Lorentz microscopy to image structures well under the micron length-scale allowing the observation of dimensions not covered by previous investigations [5,6,12]. Therefore the potential for future applications in patterned nanoscale structures of these materials for sensors and spintronic devices may be demonstrated using such a technique.…”

Section: Discussionmentioning

confidence: 75%

“…Ion irradiation has been used to pattern periodic ferromagnetic (FM) stripe array structures where FM stripes of different saturation magnetization are present [5,12]. Such a periodic stripe like pattern of the ion-beam-modified films [12,13] has proven already the strong influence of the lengthscale of the lateral patterning on the micromagnetic behavior of the hybrid material [5,6]. Compared to conventional techniques like reactive ion etching, ion-beam assisted patterning provides additional advantages like the possibility to locally modify magnetic properties [14,15] without multistep deposition processes using different materials [12].…”

Section: Introductionmentioning

confidence: 99%

Lorentz TEM Imaging of Stripe Structures Embedded in a Soft Magnetic Matrix

et al. 2015

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Néel walls in soft magnetic NiFe/NiFeGa hybrid stripe structures surrounded by a NiFe film are investigated by high resolution Lorentz transmission electron microscopic imaging. An anti-parallel orientation of magnetization in 1000 nm wide neighboring unirradiated-irradiated stripes is observed by forming high angle domain walls during magnetization reversal. Upon downscaling the stripe structure size from 1000 nm to 200 nm a transition from a discrete domain pattern to an effective magnetic medium is observed for external magnetic field reversal. This transition is associated with vanishing ability of hosting high angle domain walls between adjacent stripes. The investigation also demonstrated the potentiality of Lorentz microscopy to image periodic stripe structures well under micron length-scale.

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Introducing artificial length scales to tailor magnetic properties

Cited by 87 publications

References 63 publications

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

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

Self-organized nanopatterning of silicon surfaces by ion beam sputtering

Lorentz TEM Imaging of Stripe Structures Embedded in a Soft Magnetic Matrix

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