Low spin-wave damping in amorphous Co40Fe40B20 thin films

Conca, A.; Greser, J.; Sebastian, Tina; Klingler, Stefan; Obry, B.; Leven, B.; Hillebrands, B.

doi:10.1063/1.4808462

Cited by 88 publications

(56 citation statements)

References 19 publications

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“…In most metallic ferromagnets, the rather large Gilbert damping limits the propagation distance of spin-wave modes. Even though recent developments aiming at the utilization of novel or optimized materials in the field of magnonics show great potential [51,[125][126][127][128], spin-wave damping remains a major challenge.…”

Section: Temporal Analysismentioning

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: Temporal Analysismentioning

confidence: 99%

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

et al. 2015

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“…The details about the estimation of a are reported elsewhere. 2 Exemplarily, the dependence of the width of the FMR peak DH on the frequency for the film annealed at 383 C is shows the dependence of the width of the FMR peak on the frequency exemplarily for the film annealed at 383 C. The red line represents a linear fit to the data from which the a parameter is extracted. exemplarily shown.…”

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confidence: 99%

“…Papaioannou, 1 S. Klingler, 1 J. Greser, 1 T. Sebastian, 1 B. Leven, 1 J. L € osch, 2 We present a study of the influence of the annealing temperature T a on the magnetic properties of Co 40 Fe 40 B 20 thin films. Using a vector network analyzer ferromagnetic resonance (VNA-FMR) setup and the magneto-optical Kerr effect, the dependence of the Gilbert damping parameter a, the exchange constant A, the saturation magnetization as well as the coercive field and the Kerr signal on T a is reported.…”

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confidence: 99%

“…For these purposes, the alloy CoFeB is a very promising material for which low damping properties have been reported. [1][2][3] CoFeB is commonly used in the fabrication of magnetic tunneling junctions, providing high tunneling magnetoresistance (TMR) ratios in combination with MgO barriers. It is known that an annealing step is required to induce a crystallization of the as-deposited amorphous CoFeB thin films and, thus, achieve large tunneling magnetoresistance values.…”

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confidence: 99%

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Annealing influence on the Gilbert damping parameter and the exchange constant of CoFeB thin films

Conca¹,

Papaioannou²,

Klingler³

et al. 2014

Applied Physics Letters

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We present a study of the influence of the annealing temperature Ta on the magnetic properties of Co40Fe40B20 thin films. Using a vector network analyzer ferromagnetic resonance (VNA-FMR) setup and the magneto-optical Kerr effect, the dependence of the Gilbert damping parameter α, the exchange constant A, the saturation magnetization as well as the coercive field and the Kerr signal on Ta is reported. Additionally, the correlation with the crystalline properties of the films studied by X-ray diffractometry is discussed. We found that while the damping parameter α and the coercive field show sharp changes starting at a certain Ta value, the exchange constant A and the Kerr signal show a steady evolution. A differential modification of the film surface compared to the bulk is discussed as a possible reason. In any case, we found that the low damping values are preserved at the first onset of crystallization.

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“…However, despite being low in relative terms, the spin-wave damping in Py is still substantial and recent years have seen an expansion in efforts directed towards the search for lower-loss metallic and intermetallic alternatives. One material which -on account of its large saturation magnetization and low damping -has been recognized to be attractive for some time, is cobalt iron boron (Co 40 Fe 40 B 20 ) [70][71][72]. Particular attention is also focused on the family of so-called Heusler alloys: intermetallic compounds which, despite containing no ferromagnetic elements, are themselves ferromagnetic [73].…”

Section: Magnon Propagation In Microstructuresmentioning

confidence: 99%

Magnon Spintronics

Karenowska

Chumak

Serga

et al. 2015

Handbook of Spintronics

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Presented here is an introduction to magnon spintronics, the emerging field of research concerned with structures and devices which involve the interconversion between electronic spin currents (spin currents carried by electrons) and magnon currents (spin angular momentum fluxes which do not involve the motion of charged carriers). Aimed at the nonexpert reader, the text reviews fundamental and applied aspects of magnonics and examines how the study of the interplay between magnonic and electronic spin transport both shines a light on new physics, and opens doors to new technologies.

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Low spin-wave damping in amorphous Co40Fe40B20 thin films

Cited by 88 publications

References 19 publications

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

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

Annealing influence on the Gilbert damping parameter and the exchange constant of CoFeB thin films

Magnon Spintronics

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