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Tacchi S, Gubbiotti G, Madami M, Carlotti G. Brillouin light scattering studies of 2D magnonic crystals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:073001. [PMID: 28008880 DOI: 10.1088/1361-648x/29/7/073001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Magnonic crystals, materials with periodic modulation of their magnetic properties, represent the magnetic counterpart of photonic, phononic and plasmonic crystals, and have been largely investigated in recent years because of the possibility of using spin waves as a new means for carrying and processing information over a very large frequency bandwidth. Here, we review recent Brillouin light scattering studies of 2D magnonic crystals consisting of single- and bi-component arrays of interacting magnetic dots or antidot lattices. In particular, we discuss the principal properties of the magnonic band diagram of such systems, with emphasis given to its dependence on both magnetic and the geometrical parameters. Thanks to the possibility of tailoring their band structure by means of several degrees of freedom, planar magnonic crystals offer a good opportunity to design an innovative class of nanoscale microwave devices.
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Affiliation(s)
- S Tacchi
- Istituto Officina dei Materiali del CNR (CNR-IOM), Sede Secondaria di Perugia, c/o Dipartimento di Fisica e Geologia, Università di Perugia, I-06123 Perugia, Italy
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Bukin N, McKeever C, Burgos-Parra E, Keatley PS, Hicken RJ, Ogrin FY, Beutier G, Dupraz M, Popescu H, Jaouen N, Yakhou-Harris F, Cavill SA, van der Laan G. Time-resolved imaging of magnetic vortex dynamics using holography with extended reference autocorrelation by linear differential operator. Sci Rep 2016; 6:36307. [PMID: 27796347 PMCID: PMC5087091 DOI: 10.1038/srep36307] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 10/13/2016] [Indexed: 11/24/2022] Open
Abstract
The magnetisation dynamics of the vortex core and Landau pattern of magnetic thin-film elements has been studied using holography with extended reference autocorrelation by linear differential operator (HERALDO). Here we present the first time-resolved x-ray measurements using this technique and investigate the structure and dynamics of the domain walls after excitation with nanosecond pulsed magnetic fields. It is shown that the average magnetisation of the domain walls has a perpendicular component that can change dynamically depending on the parameters of the pulsed excitation. In particular, we demonstrate the formation of wave bullet-like excitations, which are generated in the domain walls and can propagate inside them during the cyclic motion of the vortex core. Based on numerical simulations we also show that, besides the core, there are four singularities formed at the corners of the pattern. The polarisation of these singularities has a direct relation to the vortex core, and can be switched dynamically by the wave bullets excited with a magnetic pulse of specific parameters. The subsequent dynamics of the Landau pattern is dependent on the particular configuration of the polarisations of the core and the singularities.
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Affiliation(s)
- N. Bukin
- School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, United Kingdom
| | - C. McKeever
- School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, United Kingdom
| | - E. Burgos-Parra
- School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, United Kingdom
| | - P. S. Keatley
- School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, United Kingdom
| | - R. J. Hicken
- School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, United Kingdom
| | - F. Y. Ogrin
- School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, United Kingdom
| | | | - M. Dupraz
- Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - H. Popescu
- SOLEIL Synchrotron, 91192 Saint-Aubin, France
| | - N. Jaouen
- SOLEIL Synchrotron, 91192 Saint-Aubin, France
| | - F. Yakhou-Harris
- European Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France
| | - S. A. Cavill
- Department of Physics, University of York, York, YO10 5DD, United Kingdom
| | - G. van der Laan
- Diamond Light Source, Harwell Science and innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
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Marrows CH, Hickey BJ. New directions in spintronics. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2011; 369:3027-3036. [PMID: 21727112 DOI: 10.1098/rsta.2011.0156] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Conventional microelectronics exploits only the charge degree of freedom of the electron. Bringing the spin degree of freedom to bear on sensing, radio frequency, memory and logic applications opens up new possibilities for 'more than Moore' devices incorporating magnetic components that can couple to an external field, store a bit of data or represent a Boolean state. Moreover, the electron spin is an archetypal two-state quantum system that is an excellent candidate for a solid-state realization of a qubit.
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Affiliation(s)
- C H Marrows
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK.
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