Magnonic band structure of domain wall magnonic crystals

Wang, D.; Zhou, Yan; Li, Zhixiong; Nie, Yao-zhuang; Wang, Xi-Guang; Guo, Guang-hua

doi:10.1109/tmag.2016.2633238

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…As pointed out in section 2.3.1 periodic spatial modulation of any magnetic parameter may be used to design MCs. Such modulation may be done on the domain pattern of a thin film [260,261] or periodic magnetic vortices [262,263]. Likewise this may be realised by introducing ordered topological defects in the system.…”

Section: Magnonic Crystals Based On Topological Defectsmentioning

confidence: 99%

Magnonic crystals: towards terahertz frequencies

Zakeri

2020

J. Phys.: Condens. Matter

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This topical review presents an overview of the recent experimental and theoretical attempts on designing magnonic crystals for operation at different frequencies. The focus is put on the microscopic physical mechanisms involved in the formation of the magnonic band structure, allowed as well as forbidden magnon states in various systems, including ultrathin films, multilayers and artificial magnetic structures. The essential criteria for the formation of magnonic bandgaps in different frequency regimes are explained in connection with the magnon dynamics in such structures. The possibility of designing small-size magnonic crystals for operation at ultrahigh frequencies (terahertz and sub-terahertz regime) is discussed. Recently discovered magnonic crystals based on topological defects and using periodic Dzyaloshinskii-Moriya interaction, are outlined. Different types of magnonic crystals, capable of operation at different frequency regimes, are put within a rather unified picture.

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Section: Magnonic Crystals Based On Topological Defectsmentioning

confidence: 99%

Magnonic crystals: towards terahertz frequencies

Zakeri

2020

J. Phys.: Condens. Matter

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“…Analytical solutions of the problem for graded magnonic landscapes are relatively rare and often obtained under strong approximations. 41,48,53,55,[60][61][62][63]66,67,76,77,79 When solved numerically on a discrete mesh, the problem can be reduced to that of the dynamical matrix method (DMM), which can yield all the normal mode frequencies and profiles of the system in question 93,94 and its response to an external excitation (i.e. magnetic susceptibility).…”

Section: Theoretical Formalismmentioning

confidence: 99%

“…[53][54][55][56][57][58] The static magnetization and effective magnetic field are generally recognized as representing a landscape across which spin waves propagate. 12,22,23,40,42,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] The spatial variation of either the static magnetization and / or effective magnetic field can lead to spin-wave confinement, [61][62][63][64][65][66] while recently it has also been demonstrated to steer the direction of spin-wave propagation. 22,41,[48][49][50]57,58,61,67,68 The scattering of spin waves from the non-uniformities of the internal field and magnetization were studied e.g.…”

Section: Introductionmentioning

confidence: 99%

Mapping the magnonic landscape in patterned magnetic structures

2017

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We report the development of a hybrid numerical / analytical model capable of mapping the spatially-varying distributions of the local ferromagnetic resonance (FMR) frequency and dynamic magnetic susceptibility in a wide class of patterned and compositionally modulated magnetic structures. Starting from the numerically simulated static micromagnetic state, the magnetization is deliberately deflected orthogonally to its equilibrium orientation, and the magnetic fields generated in response to this deflection are evaluated using micromagnetic software. This allows us to calculate the elements of the effective demagnetizing tensor, which are then used within a linear analytical formalism to map the local FMR frequency and dynamic magnetic susceptibility. To illustrate the typical results that one can obtain using this model, we analyze three micromagnetic systems boasting non-uniformity in either one or two dimensions, and successfully explain the spin-wave emission observed in each case, demonstrating the ubiquitous nature of the Schlömann excitation mechanism underpinning the observations. Finally, the developed model of local FMR frequency could be used to explain how spin waves could be confined and steered using magnetic non-uniformities of various origins, rendering it a powerful tool for the mapping of the graded magnonic index in magnonics.

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Topological damping Rashba spin-orbit torque in ballistic magnetic domain walls

Wang

Zhou

2020

Phys. Rev. B

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Rashba spin orbit torque derived from the broken inversion symmetry at ferromagnet/heavy metal interfaces has potential application in spintronic devices. In conventional description of the precessional and damping components of the Rashba spin orbit torque in magnetization textures, the decomposition coefficients are assumed to be independent of the topology of the underlying structure. Contrary to this common wisdom, for Schrödinger electrons trespassing ballistically across a magnetic domain wall, we found that the decomposition coefficient of the damping component is determined by the topology of the domain wall. The resultant damping Rashba spin orbit torque is protected by the topology of the underlying magnetic domain wall and robust against small deviations from the ideal domain wall profile. Our identification of a topological damping Rashba spin orbit torque component in magnetic domain walls will help to understand experiments on current driven domain wall motion in ferromagnet/heavy metal systems with broken inversion symmetry and to facilitate its utilization in innovative device designs.One main theme in the field of nanomagnetism is to search for new approaches to realize fast and energy efficient manipulation of magnetic state, rather than using the conventional magnetic field. In the past three decades, several promising candidates, such as electric field 1 , laser pulses 2 and spin current through the spin transfer torque (STT) 3-6 , were proposed. A recent development along this line is the emergence of the Rashba spin orbit torque (RSOT) in magnetic systems without inversion symmetry. In a simple picture 7 , the electric field along the symmetry breaking direction is equivalent to a magnetic field, dubbed the Rashba field, in the rest reference frame of an electron in motion. Due to the s-d exchange between the local and itinerant spin degrees of freedom, the Rashba field is transformed into the RSOT acting on the local magnetization.When it was first proposed, only the precessional component 8-11 of the RSOT, corre-

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Magnonic band structure of domain wall magnonic crystals

Cited by 4 publications

References 51 publications

Magnonic crystals: towards terahertz frequencies

Magnonic crystals: towards terahertz frequencies

Mapping the magnonic landscape in patterned magnetic structures

Topological damping Rashba spin-orbit torque in ballistic magnetic domain walls

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