Visualization of spin dynamics in single nanosized magnetic elements

Banholzer, Anja; Narkowicz, R.; Hassel, C.; Meckenstock, R.; Stienen, Sven; Posth, Oliver; Suter, Dieter; Farle, Michael; Lindner, J.

doi:10.1088/0957-4484/22/29/295713

Cited by 57 publications

(60 citation statements)

References 17 publications

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“…Since the dynamic magnetization is expected to be width dependent only, the numbers of cells along the wire length and thickness are not critical. In these simulations, we applied a spatially uniform continuous wave magnetic drive field to the wire [55][56][57] . The simulation results were analyzed after the system had reached the dynamic equilibrium.…”

Section: Theorymentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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We report experimental and theoretical studies of spin wave eigenmodes in transversely magnetized thin film Permalloy wires. Using broadband ferromagnetic resonance technique, we measure the spectrum of spin wave eigenmodes in individual wires as a function of magnetic field and wire width. Comparison of the experimental data to our analytical model and micromagnetic simulations shows that the intrinsic dipolar edge pinning of spin waves is negligible in transversely magnetized wires. Our data also quantify the degree of extrinsic edge pinning in Permalloy wires. This work establishes the boundary conditions for dynamic magnetization in transversely magnetized thin film wires for the range of wire widths and thicknesses studied, and provides a quantitative description of the spin wave eigenmode frequencies and spatial profiles in this system as a function of the wire width.

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Section: Theorymentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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“…Recent developments regarding microwave cavities and microresonators pushed the field of microwave absorption techniques toward the detection of spin dynamics in individual nanoscale magnetic structures [37]. However, in all cases the dynamic magnetic response is averaged over the entire investigated structure or even arrays of magnetic elements.…”

Section: Introductionmentioning

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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“…Since the resonators can be relatively small, smaller samples can be measured. Banholzer et al [248] and Schoeppner et al [249] have recently reported on the measurement of micron-sized ferromagnetic elements using this method. In Fig.…”

Section: Ferromagnetic Resonancementioning

confidence: 99%