Magnonic and Magneto-Photonic Crystals
Investigation of Optical, Magnetic and Elastic Properties of Magneto-Photonic and Magnonic Crystals and Their Use for Optic and Microwave Signal Processing
Tech Area / Field
- PHY-SSP/Solid State Physics/Physics
3 Approved without Funding
Russian Academy of Sciences / Institute of Radioengineering and Electronics, Russia, Moscow
- P.L.Kapitza Institute of Physics Problems, Russia, Moscow\nUral Branch of RAS / Institute of Metal Physics, Russia, Sverdlovsk reg., Ekaterinburg\nInstitute of Physics of Microstructures, Russia, N. Novgorod reg., N. Novgorod
- Loughborough University, UK, Loughborough\nLaboratory of Solid State Physics, University of Groningen, The Netherlands, Groningen\nOhio State University, USA, OH, Columbus\nCIRIMAT,UMR-CNRS 5085,Universite Paul Sabatier (CIRIMAT), France, Toulouse\nRuhr Universiry, Germany, Bochum\nUniversity of Cambridge / Cavendish Laboratory, UK, Cambridge\nInstitute for Microelectronics and Microsystems, CNR, Italy, Rome\nTohoku University, Institute for Material Research (HFL), Japan, Sendai\nUniversitat Kaiserslautern / Fachberaich Physik, Germany, Kaiserlautern
Project summaryAims of investigations:
During the last decade considerable attention in scientific community among physicists, material researchers and chemists has been paid to the possibility of controlling or engineering the optical properties of the materials. For example, a number of artificially arranged materials were engineered to propagate light in particular direction inside these materials or in specific areas only. Such materials also enable light to be localized in chosen channels or zones, or even completely prohibit the propagation of light. They are now known as photonic crystals. Basically, the photonic crystal (PC) is a material that possesses periodic index of refraction. A simple example of periodic photonic crystals, also known as one-dimensional (1- D) PC is a multilayered periodic structure. In such structures there exist a range of frequencies for which the light (photon) propagation is prohibited. Recently, it was also demonstrated that such crystals could be made in two and three dimensions. Such structures can have a complete photonic band gap, meaning that light is prohibited to propagate in any direction inside such a crystal. To realize a PC with a complete photonic band gap, the material must have both high refractive index and proper three-dimensional structure to open a complete photonic band gap. Again, it was demonstrated recently that even 1-D PC may be arranged in such a way that an omnidirectional reflector (therefore having the complete photonic band) may be constructed. PC made of magnetic material or the multilayered structures containing one or any number magnetic layers can also be named magneto-photonic crystals. Similar to PC another class of crystals known as phononic crystals was also reported most recently. These crystals possess the properties of PC but for acoustical waves (phonons) instead of light. There exists, however, another possibility to control properties of PC by using the magnetic materials for magneto-photonic crystals. Moreover, it is possible to create similar crystals where instead of light (or electromagnetic waves) spin waves (SW) are used as the carriers of information. Drawing an analogy from photonic and phononic crystals they may be called as magnonic crystals (because magnons are the quasi-particles of spin waves). Magnetic 1- D periodic layered structures have also been studied for more than decade since the giant magnetoresistive effect was discovered in the three-layer system containing the magnetic and non-magnetic layers. Excitation of spin waves was used to study the properties of such systems, however the idea to use them as a possible candidate for the systems similar to PC has never been addressed.
The main idea of the Project is to investigate optical, magnetic and elastic properties of magneto-photonic crystals (MPC) and magnonic crystals (MC) and to elaborate recommendations for their possible use at signal processing devices of the optic and microwave frequency ranges. Besides, it is assumed to investigate nature and concrete mechanisms of the specific interaction between magnetic layers and granules (droplets) in magnetic metallic and oxide structures (MS). Such structures can be of the different content and geometry and essentially present the new materials classes, which do not usually exist in nature. Their unusual optical and magnetic properties can be very interesting and important for the fundamental knowledge broadening. And, again the use of these structures opens new possibilities to develop new electronic components for the modern telecommunication and information processing systems.
We shall discuss in details two types of MPC, MC and MS. Namely, 1) the structures based on the films of metals, dielectrics and semiconductors, grown by molecular beam epitaxy method, thermal or magnetron sputtering; 2) the structures based on the doped and undoped yttrium-iron-garnet films (YIG), garnet and other ferrites derivatives, grown by liquid phase epitaxy method. Depending on the type of above structures the investigations will be carried out in following three directions.
At first, we shall investigate and interpret by our own theoretical approaches the effects related to nonlinear processes of self-interaction and interaction between spin waves in magnonic crystals and light interaction in magneto-photonic crystals. Besides, we plan to obtain information on microwave and RF properties of the above-mentioned structures. We shall investigate optical properties of these structures, namely: 1) waveguide properties; 2) the efficiency of light scattering on spin and magneto-elastic oscillations and waves; 3) magneto-optic Faraday and Kerr effects (in particular, influence the interfaces). This should give important information on how the high efficiency of optical signal processing can be reached using MPC. For example, how it can be done at signal modulation or their space filtration.
Secondly, we suppose to investigate experimentally the interlayer exchange and related to it magnetic order in metallic multilayered structures grown by molecular beam epitaxy. As an investigation object we plan to consider the systems with noncollinear magnetic order. Particular interesting system is Fe/Cr due to the complex magnetic system of the Cr ions. The exchange effects in such systems are most complicated, therefore their investigation requires various methods. We shall study also stratified and phase-stratified manganites. These investigations will permit to obtain information on the character of exchange interaction in the investigated structures and on the influence at this interaction the electronic and magnetic structure of interlayer and inter-granules intermediate layers. The obtained experimental data will be analyzed within the frames of the existing theoretical models and will stimulate its following development.
Third, we plan to study experimentally magnetooptical properties of two-dimensional lattices of ferromagnetic nano-particles. Main idea is to increase the diffraction magnetooptic response in such systems. It is planned to study the features of Brillouin light scattering from the lattices of ferromagnetic nano-particles. This will permit to get direct information on particles interactions. The data obtained will be compared to the results obtained by different methods (such as differential Hall magnetometry, magnetic force magnetometry) and will be analyzed by existing theoretical approaches.
Estimation from the point of view the possible applications of the results obtained within the three indicated directions of investigations will permit to formulate the new principles of device operation. We shall formulate the recommendations how to develop most perspective devices and demonstrate their functional and technical characteristics. The aim is to use cheap widely distributed materials with such properties, which possess device operation at room temperatures and at frequencies useful for applications in existing civilian telecommunication and information processing systems. Such devices can be of great interest and be able to compete at the electronic components market.
Evolution of modern electronics is characterized by the tendency of transformation to micro- and nano-objects and use of nano-materials. Therefore, investigation of physical nature of the unique properties of the indicated above objects and structures and formulation of possibility of aim-directed management by the transport processes in them is an important problem. It has two-fold result – scientific and applied due to new functional possibilities of these materials.
At present time the comprehensive experimental and theoretical investigations of the fundamental properties of the structured magnetic objects such as superlattices, stratified and phase-stratified manganites and investigations of their possible practical applications are conducted in many laboratories in USA, Japan and Western Europe. Similar investigations are also conducted in laboratories in Russia, in particular, in IRE RAS, IPP RAS, IPM RAS (NN) and IPM RAS (E). A number of important basic results were obtained. However, many of important questions are still waiting the answers. The current Project is aimed to answer at these questions.
The Project is within the frame of ISTC aims and tasks without any doubts. This Project will permit to a big group of researchers and engineers from various Russian academic institutes (IRE RAS, IPP RAS, IPM RAS (NN) and IPM RAS (E)) having the knowledge and qualification at the area of armament development and investigations to re-orient completely in peaceful activity.