Reflection-less width-modulated magnonic crystal

Abstract

The interest in artificial magnetic media such as magnonic crystals increased substantially in recent years due to their potential applications in information processing at microwave frequencies. The main features of these crystals are the presence of band gaps in the spin-wave spectra, usually formed due to Bragg reflections of spin-waves on the artificially created periodic structures. Here, we study spin-wave propagation in longitudinally magnetized width-and thickness-modulated yttrium iron garnet waveguides by means of Brillouin light scattering and microwave spectroscopy techniques. It is found that the width modulated crystal does not manifest noticeable Bragg reflections, but still demonstrates a pronounced band gap in its transmission characteristic. The phenomenon can be explained by the destructive interference between different frequency-degenerated spin-wave modes excited by the crystal. Such a reflection-less crystal is promising for future design of multi-element magnonic devices.

Electromagnonic crystals based on ferrite–ferroelectric–ferrite multilayers

“…4 a ). The first and the second waveguiding structures are discussed in detail [5–14, 34–38] while the third one was not investigated. The experimental and theoretical investigations of transmission characteristics of the third waveguiding structure validate the mechanism of the band structure formation when compared with other structures.…”

“…Among different types of the magnetic materials, the epitaxial yttrium‐iron garnet (YIG) films are widely used for MC fabrication due to certain essential advantages: (i) small out‐of‐band insertion losses; (ii) deep rejection bands; (iii) well‐developed techniques of MC fabrication ranging from metal deposition, chemical etching, ion implantation, or other methods to produce a periodical variation of any magnetic parameter. As a result, the MCs are successfully utilised for realisation of the various microwave devices such as power limiters [5], magnetic field sensors [6, 7], microwave oscillators [8, 9], spin‐wave logic gates [10], magnon transistors [11] and filters [12].…”

Управляемая Электрическим Полем Спин-Волновая Связь В Латеральных Ансамблях Магнитных Микроструктур

“…Использование элементарных квантов магнитных возбуждений (магнонов) и спиновых волн (СВ) в диэлектрических магнитных пленках, поддерживают передачу сигнала без движения зарядов и, следовательно, без омических потерь, обеспечивают сверхнизкое энергопотребление и являются многообещающей альтернативой полупроводниковым приборам [1][2][3]. Одним из новых научных направлений в физике конденсированного состояния является магноника [4][5][6], ставящая перед собой задачи по исследованию методов и характеристик управления спиновыми волнами в волноведущих системах в микрои наномасштабах [7,8].…”

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

“…Realizing a geometry-driven energy band gap formation allows enabling several prominent features to emerge, such as guided information carrier by periodic arrays of nanostrips [7,8] and width-modulated nanogratings [9][10][11][12]. Besides that spatial periodic variation of saturation magnetization, alternating nanostrips, filters, and phase shifters were investigated with different material classes [8,[13][14][15][16], where Y 3 Fe 5 O 12 (YIG) and permalloy were the common types for MC. YIG provides lower damping and low loss propagation of spin-waves [1,17].…”