Mapping of localized spin-wave excitations by near-field Brillouin light scattering

Jersch, J.; Demidov, V. E.; Fuchs, H. D.; Rott, Karsten; Krzysteczko, Patryk; Münchenberger, Jana; Reiss, Günter; Demokritov, S. O.

doi:10.1063/1.3502599

Cited by 61 publications

(33 citation statements)

References 23 publications

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“…We point out that the results presented here enable us to probe the DMI of magnetic strip with the width of sub-50 nm by measuring the GH shift between the incident and reflected spin-wave beams. This method requires the spin-wave imaging with the spatial resolution in the range of about 500 nm (the width of the spin-wave beam), which can be achieved by X-ray magnetic circular dichroism (XMCD) [34] or the near-field BLS [35]. Recently, a GH-like phase shift for magnetostatic spin waves has been observed in experiments [36].…”

Section: Discussionmentioning

confidence: 99%

Goos-Hänchen effect of spin waves at heterochiral interfaces

2019

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We theoretically investigate the Goos-Hänchen (GH) effect of spin-wave beams reflected from the interface between two ferromagnetic films with different Dzyaloshinskii-Moriya interactions (DMIs). The formula of the GH shift as functions of the incident angle and material parameters is derived analytically. We show that the GH effect occurs only when spin waves are totally reflected at the interface and vanishes otherwise. We further explore the GH shift of spin waves by narrow DMI strips of different widths. It is found that the induced shift is independent of the strip width down to 10 nm, offering a novel approach to measure the DMI strength of ultra-narrow magnetic strips which is out the scope of current technology. Full micromagnetic simulations compare well with our theoretical findings. Strong distortion of edge magnetizations for narrower strips however generates a width dependence of the GH shift. The results presented in this work are helpful for understanding the GH effect in chiral magnets and for quantifying the DMI parameter in magnetic strips of sub-50 nm scales.

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Section: Discussionmentioning

confidence: 99%

Goos-Hänchen effect of spin waves at heterochiral interfaces

2019

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“…Thus, new approaches have to be realized to achieve a further, substantial increase of the spatial resolution in BLS spectroscopy. A possible way was presented by Jersch and co-workers who combined near-field optics with BLS spectroscopy and, thus, obtained a spatial resolution of about 55 nm enabling the characterization of nanoscale spinwave edge modes [71]. Unfortunately, this benefit comes at the cost of a strongly decreased signal strength and, as a result, very time-consuming measurements.…”

Section: Optical Setupmentioning

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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“…Recently, BLS has been used to detect the spin-wave eigenmodes of nanoscale ferromagnetic elements, in addition to the splitting of the normal modes of interacting elements [21,22] and the dispersion of collective excitations within arrays [23]. The spatial resolution of BLS has been improved, yielding images of spin-wave radiation from a spin valve in micro-focus BLS experiments [24] and localized edge modes of a microscale ellipse in nearfield BLS experiments [25]. The addition of TR capability to BLS has yielded TR images of the propagation of confined spin waves within microscale structures [26].…”

Section: Dynamical Phenomena and Measurement Techniquesmentioning

confidence: 99%

Ultrafast magnetization dynamics of spintronic nanostructures

Keatley

Kruglyak

Gangmei

et al. 2011

Phil. Trans. R. Soc. A.

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The ultrafast (sub-nanosecond) magnetization dynamics of ferromagnetic thin films and elements that find application in spintronic devices is reviewed. The major advances in the understanding of magnetization dynamics in the two decades since the discovery of giant magnetoresistance and the prediction of spin-transfer torque are discussed, along with the plethora of new experimental techniques developed to make measurements on shorter length and time scales. Particular consideration is given to time-resolved measurements of the magneto-optical Kerr effect, and it is shown how a succession of studies performed with this technique has led to an improved understanding of the dynamics of nanoscale magnets. The dynamics can be surprisingly rich and complicated, with the latest studies of individual nanoscale elements showing that the dependence of the resonant mode spectrum upon the physical structure is still not well understood. Finally, the article surveys the prospects for development of high-frequency spintronic devices and highlights areas in which further study of fundamental properties will be required within the coming decade.

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Mapping of localized spin-wave excitations by near-field Brillouin light scattering

Cited by 61 publications

References 23 publications

Goos-Hänchen effect of spin waves at heterochiral interfaces

Goos-Hänchen effect of spin waves at heterochiral interfaces

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

Ultrafast magnetization dynamics of spintronic nanostructures

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