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Novel Wave Phenomena in Magnetic Nanostructures

Final Report Summary - NOWAPHEN (Novel Wave Phenomena in Magnetic Nanostructures)

Project Acronym and Number: NoWaPhen 247556
Project Title: Novel Wave Phenomena in Magnetic Nanostructures
Start and End Dates: 3/5/2010 till 2/5/2014
EC Contribution: 333,000 €
Topic
Spin waves and electromagnetic waves in magnetic, superconducting, and hybrid nano-materials and devices
Summary of project goals
The academic exchange aims to establish and support multi-lateral transfer of knowledge and expertise among several European and international research teams striving to advance the research fields of magnonics and magneto-photonics.
Funded by the FP7 NMP programme, the beneficiaries (UNEXE, TUM, and AMU) have already formed an EU collaboration to explore novel nano-structured magnonic meta-materials of magnonics. The academic exchange aims to augment this activity by collaborations with leading groups in Ukraine (DONNU, DIPE, KKNU, and IMAG) and Russia (Kotel’nikov), and thereby to explore new opportunities in physics of magnetic nanostructures in areas where the existing knowledge is yet insufficient to set up a full-scale research programme. The ambition is to carry out adventurous proof-of-concept studies aiming to underpin future directions of science and technology of magnetic meta-materials.
Potential Applications
Spintronics, magnonics, electromagnetics, and microwave electronics, including magnonic and magneto-photonic crystals, spintronic, magnonic, and hybrid superconductor-magnetic devices interconnected with more conventional photonic, plasmonic, and electronic devices.

Coordinator: Volodymyr Kruglyak, University of Exeter, UK
V.V.Kruglyak@exeter.ac.uk

Relevant review articles:
V. V. Kruglyak, S. O. Demokritov, and D. Grundler, “Magnonics”, J. Phys. D – Appl. Phys. 43, 264001 (2010);
M. Krawczyk and D. Grundler, “Review and prospects of magnonic crystals and devices with reprogrammable band structure”, J. Phys. Cond. Matter. 26, 123202 (2014).

Summary of the key achievements
1. A composite fermion theory of the metal-insulator transition in a two-dimensional conductor with the long-range Coulomb interaction between electrons has been developed. [V. M. Gvozdikov, "Composite fermions without a magnetic field: An application to the metal-insulator transition in a two-dimensional conductor with the long-range Coulomb interaction between electrons", Phys. Rev. B 82, 235110 (2010)]
2. A detailed theoretical understanding of the temperature- and thickness-dependence of the photonic band gap spectra of the one-dimensional photonic crystal with a superconducting defect layer has been developed. [N. N. Dadoenkova, A. E. Zabolotin, I. L. Lyubchanskii, Y. P. Lee, and Th. Rasing, "One-dimensional photonic crystal with a complex defect containing an ultrathin superconducting sublayer", J. Appl. Phys. 108, 093117 (2010)]
3. Micromagnetic method of s-parameter characterization of magnonic devices has been developed and tested. The method allows numerical characterisation of magnonic devices in terms of their s-parameters. [M. Dvornik, A. N. Kuchko, and V. V. Kruglyak, "Micromagnetic method of s-parameter characterization of magnonic devices", J. Appl. Phys. 109, 07D350 (2011)]
4. The magnonic counterpart of the Goos-Hanchen Effect (well-known in photonics) has been theoretically predicted to occur in thin magnetic films and nanostructures. [Y. S. Dadoenkova, N. N. Dadoenkova, I. L. Lyubchanskii, M. Sokolovskyy, J. W. Klos, J. Romero-Vivas, and M. Krawczyk, “Huge Goos-Hanchen effect for spin waves: a promising tool for study magnetic properties at interfaces”, Appl. Phys. Lett. 101, 042404 (2012)]
5. The enhanced spin-wave transmission in nanowires with a zigzag-like magnetization state in comparison with the states of more homogeneous magnetization has been discovered. As a result, spin waves propagate in narrow channels remotely positioned from the edges. Rotation of the magnetic field at a specific value is found to vary the propagation velocity opening the perspective of creation of the velocity modulation magnonic transistor. [G. Duerr, K. Thurner, J. Topp, R. Huber, and D. Grundler, "Enhanced transmission through squeezed modes in a self-cladding magnonic waveguide", Phys. Rev. Lett. 108, 227202 (2012)]
6. A novel exchange-based magnetic anisotropy has been discovered. [V. S. Tkachenko, A. N. Kuchko, M. Dvornik, and V. V. Kruglyak, “Propagation and scattering of spin waves in curved magnonic waveguides”, Appl. Phys. Lett. 101, 152402 (2012)]
7. A new class of non-reciprocal spin-wave phenomena inherent to metallised magnonic crystals has been discovered. [M. Mruczkiewicz, M. Krawczyk, G. Gubbiotti, S. Tacchi, Y. A. Filimonov, D. V. Kalyabin, I. V. Lisenkov, S. A. Nikitov, "Nonreciprocity of spin waves in metallized magnonic crystal", New J. Phys. 15, 113023 (2013)]
8. Criteria for occurrence of localised states in magnonic crystals with defects have been proposed. [J. W. Klos and V. Tkachenko, “Symmetry-related criteria for the occurrence of defect states in magnonic superlattices”, J. Appl. Phys. 113, 133907 (2013)]
9. Periodically modulated metamaterials combining functional properties of both photonic and magnonic crystals have been invented. [J. W. Klos, M. Krawczyk, Yu. S. Dadoenkova, N. N. Dadoenkova, and I. L. Lyubchanskii, “Photonic-magnonic crystals: multifunctional periodic structures for photonics and magnonics”, J. Appl. Phys. 115, 174311 (2014)]
10. A detailed understanding of spin wave propagation in networks of magnonic waveguides biased by applied magnetic field has been achieved. [C. S. Davies, A. Francis, A. V. Sadovnikov, S. V. Chertopalov, M. T. Bryan, S. V. Grishin, D. A. Allwood, Y. P. Sharaevskii, S. A. Nikitov, and V. V. Kruglyak, (unpublished)]