YIG Thin Film-Based Two-Dimensional Magnonic and Magneto-Photonic Crystals
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J2.2.1
YIG Thin Film-Based Two-Dimensional Magnonic and Magneto-Photonic Crystals S.A.Nikitov1, C.S.Tsai2, Yu.V.Gulyaev1, Yu.A.Filimonov1, A.I.Volkov1, S.L.Vysotskii1, Ph.Tailhades3 1
Institute of Radieengineering and Electronics, Russian Academy of Sciences, 11, Mokhovaya St., Moscow, Center, 101999, Russia
2
Department of Electrical and Computer Engineering, University of California, Irvine, CA 92697, USA and Electrooptic Engineering Institute,National Taiwan University
3
CIRIMAT-UMR CNRS 5085-Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France
Abstract A new type of photonic crystals entitled “magnonic crystals (MC)” that exhibit forbidden gaps in the microwave spectrum of magnetostatic spin waves (MSW) are reported. The topography of the MCs that consist of two-dimensional (2-D) etched holes periodic structure in yttrium iron garnet films was studied by atomic force and magnetic force magnetometry. The propagation characteristics of spin waves in such 2-D MCs was measured and analyzed.
J2.2.2
1. Introduction During the last decade considerable efforts have been made in the sciences and technology for controlling or engineering the optical properties of the materials. For example, a number of artificially arranged materials were engineered to facilitate light propagation in particular direction or in specific regions only. Such materials also enable light to be localized in chosen channels or zones, or even prohibit the propagation of light completely. They are now known as photonic crystals [1]. Generally speaking, the photonic crystal (PC) is a material that possesses periodic index of refraction. A simple example of photonic crystals, also known as onedimensional (1- D) PC is a multilayered periodic structure [2]. In such structures there exist a range of frequencies for which the light (photon) propagation is prohibited. It was also demonstrated that such crystals can be made in two and three dimensions [3]. 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. Similar to PC, the another class of crystals known as phononic crystals [4] was also reported. These crystals possess the properties of PC but for acoustic waves (phonons) instead of light. There exists, however, still another possibility to control properties of PC by using the magnetic materials for magneto-photonic crystals [5, 6,]. Morover, it is possible to engineer magnetic materials 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 magnonic crystals (because magnons are the quasiparticles of spin waves). Magnetic 1-D periodic layered structures have also been studied for more than a decade since the giant magnetoresistive effect was discovered in the three-layer s
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