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  Imaging spin dynamics on the nanoscale using X-Ray microscopy

Stoll, H., Noske, M., Weigand, M., Richter, K., Krüger, B., Reeve, R. M., et al. (2015). Imaging spin dynamics on the nanoscale using X-Ray microscopy. Frontiers in Physics, 3: 00026. doi:10.3389/fphy.2015.00026.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CD0F-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CD10-2
Genre: Journal Article

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fphy-03-00026.pdf (Publisher version), 5MB
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© Stoll, Noske, Weigand, Richter, Krüger, Reeve, Hänze, Adolff, Stein, Meier, Kläui and Schütz

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http://dx.doi.org/10.3389/fphy.2015.00026 (Publisher version)
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 Creators:
Stoll, Hermann1, Author              
Noske, Matthias1, Author              
Weigand, Markus1, Author              
Richter, Kornel2, Author
Krüger, Benjamin2, Author
Reeve, Robert M.2, Author
Hänze, Max3, Author
Adolff, Christian F.3, Author
Stein, Falk-Ulrich3, Author
Meier, Guido3, 4, 5, 6, Author              
Kläui, Mathias2, Author
Schütz, Gisela1, Author              
Affiliations:
1Dept. Modern Magnetic Systems, Max Planck Institute for Intelligent Systems, Max Planck Society, ou_1497648              
2Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany, ou_persistent22              
3Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Hamburg, Germany, ou_persistent22              
4Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074319              
5Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074323              
6The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Hamburg, Germany, ou_persistent22              

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Free keywords: spin waves; domain walls; vortex dynamics; nano wires; X-ray microscopy; vortex core reversal; coupled modes; spin-transfer-torque
 Abstract: The dynamics of emergent magnetic quasiparticles, such as vortices, domain walls and bubbles are studied by scanning transmission X-ray microscopy (STXM), combining magnetic (XMCD) contrast with about 25 nm lateral resolution as well as 70 ps time resolution. Essential progress in the understanding of magnetic vortex dynamics is achieved by vortex core reversal observed by sub-GHz excitation of the vortex gyromode, either by ac magnetic fields or spin transfer torque. The basic switching scheme for this vortex core reversal is the generation of a vortex-antivortex pair. Much faster vortex core reversal is obtained by exciting azimuthal spin wave modes with (multi-GHz) rotating magnetic fields or orthogonal monopolar field pulses in the x and y direction, down to 45 ps in duration. In that way unidirectional vortex core reversal to the vortex core “down” or “up” state only can be achieved with switching times well below 100 ps. Coupled modes of interacting vortices mimic crystal properties. The individual vortex oscillators determine the properties of the ensemble, where the gyrotropic mode represents the fundamental excitation. By self-organized state formation we investigate distinct vortex core polarization configurations and understand these eigenmodes in an extended Thiele model. Analogies with photonic crystals are drawn. Oersted fields and spin-polarized currents are used to excite the dynamics of domain walls and magnetic bubble skyrmions. From the measured phase and amplitude of the displacement of domain walls we deduce the size of the non-adiabatic spin-transfer torque. For sensing applications, the displacement of domain walls is studied and a direct correlation between domain wall velocity and spin structure is found. Finally the synchronous displacement of multiple domain walls using perpendicular field pulses is demonstrated as a possible paradigm shift for magnetic memory and logic applications.

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Language(s): eng - English
 Dates: 2015-01-152015-03-302015-04-21
 Publication Status: Published online
 Pages: 18
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3389/fphy.2015.00026
 Degree: -

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Title: Frontiers in Physics
Source Genre: Journal
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Publ. Info: Lausanne : Frontiers Media
Pages: - Volume / Issue: 3 Sequence Number: 00026 Start / End Page: - Identifier: Other: 2296-424X
CoNE: /journals/resource/2296-424X