- Magnonics: From Fundamentals to Applications - Max Planck Society.
- Wave modes of collective vortex gyration in dipolar-coupled-dot-array.
- Imaging magnetic excitations in confined magnetic structures.
- Nano Letters | Vol 16, No 1 - ACS Publications.
- (PDF) Collective spin modes in monodimensional magnonic... - ResearchGate.
- Factors Affecting Spin Dynamics | SpringerLink.
- Spin wave quantization in laterally confined magnetic structures (invited).
- Collective spin excitations in laterally confined magne.
- MIT - Massachusetts Institute of Technology.
- Wave modes of collective vortex gyration in dipolar-coupled... - Nature.
- Magnetic skyrmion shape manipulation by perpendicular magnetic.
- Excitation of coupled oscillations in lateral... - ResearchGate.
- Hamiltonian and Lagrangian Dynamical Matrix Approaches Applied to.
- Access Denied - LiveJournal.
Magnonics: From Fundamentals to Applications - Max Planck Society.
In the and potential application in the technology of solid state de- latter work, instead, there was evidence of marked discreti- vices and magnetic recording media.1 one important issue in zation of the spin-wave spectrum for saturated cylindrical these laterally confined magnetic structures is understanding permalloy dots with radius r5100 nm.. We describe both the status of theory and recent inelastic light scattering experiments addressing the most important issues; the quantization of localized spin waves due to the in-plane.
Wave modes of collective vortex gyration in dipolar-coupled-dot-array.
Mruczkiewicz, M. Krawczyk, and K. Y. Guslienko, "Spin excitation spectrum in a magnetic nanodot with continuous transitions between the vortex, Bloch-type skyrmion, and Néel-type skyrmion states," Phys. Rev. B 95, 094414 (2017). 39. M. Collective modes of the array have been predicted with the formation of a band structure. Lastly, the spin dynamics in layered nanostructures has been recently considered. The model system consists in two ferromagnetic layers separated by a nonmagnetic layer, the ferromagnetic layers being magnetostatically coupled. Demagnetization time τ m versus spin polarization P.The half-metallic properties can be classified in a P versus τ m plot. If the points lie on top of the lines given, spin-flip blocking is the dominant mechanism describing the simultaneous increase of P and τ m.The lines are model calculations using Fermi's golden-rule approach showing the τ el-sp ~ (1-P)-1 behavior.
Imaging magnetic excitations in confined magnetic structures.
The gyrotropic rotation around the equilibrium position constitutes the fundamental excitation of magnetic vortices in nanostructures. The frequency of this mode varies with material and sample.
Nano Letters | Vol 16, No 1 - ACS Publications.
Spin wave quantization in laterally confined magnetic structures (invited) by Claude Chappert.... Spin-wave excitations in finite rectangular elements of Ni80Fe20.... Magneto-Plasmonics and Resonant Interaction of Light with Dynamic Magnetisation in Metallic and All-Dielectric Nanostructures (Review) by Ivan Maksymov. Spin excitations Py/Cu/Py rectangular dots. Multilayered magnetic nanostructures, such as spin valve structures and nanopillars, have attracted a lot of interest in recent years, thanks to their potential exploitation in a number of different devices, in the field of storage media, random-access memories, and spin-torque oscillators (STOs).
(PDF) Collective spin modes in monodimensional magnonic... - ResearchGate.
A general theory of collective spin-wave excitations in a two-dimensional array of magnetic nanodots coupled by magnetodipolar interaction is developed. The theory allows one to analytically. Recently, collective spin excitations in nano-scale magnetic elements, particularly spin waves, have become a focus of attention in nanomagnetism and related spintronics, owing to their potential implementation in information processing devices1,2,3,4,5,6,7,8,9,10,11,12, in addition to the advances made in the understanding of fundamental modes. The study of collective spin excitations in magnetically ordered materials (so-called spin waves and the associated quasi-particles---magnons) has a successful history of more than 60 years.
Factors Affecting Spin Dynamics | SpringerLink.
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Spin wave quantization in laterally confined magnetic structures (invited).
There are varied spin states in dilute magnetic semiconductors, and carriers are not the only elementary excitations that carry the spin. This article reports a study of spin interactions in excitons of ZnSe:NiI(II) nanostructures. High-quality ZnSe:NiI(II) nanobelts (NBs) prepared by chemical vapor. Graphene forms helicoids, akin to the mathematical Riemann surface for log(z), naturally occurring as screw dislocations in graphite or anthracite. The miniscule pitch of such winding carbon ribbons endows them with largest magnetic inductance per volume, which surpasses any current technologies. If voltage is applied, electrical current must flow helically, producing near the center strong. A aa aaa aaaa aaacn aaah aaai aaas aab aabb aac aacc aace aachen aacom aacs aacsb aad aadvantage aae aaf aafp aag aah aai aaj aal aalborg aalib aaliyah aall aalto aam.
Collective spin excitations in laterally confined magne.
References (24) Abstract The intensities of spin-wave (magnetostatic) modes in thin ferromagnetic films and laterally confined structures are usually insensitive to their dimensions. We observe a. Recently, collective spin excitations in nano-scale magnetic elements, particularly spin waves, have become a focus of attention in nanomagnetism and related spintronics, owing to their potential. Magnonics addresses the dynamic excitations of a magnetically ordered material. These excitations, referred to as spin waves and their quanta, magnons, are a powerful tool for information transport.
MIT - Massachusetts Institute of Technology.
Hamiltonian and Lagrangian Dynamical Matrix Approaches Applied to Magnetic Nanostructures. Advances in Condensed Matter Physics, 2012... Spin excitations in nanometric magnetic dots: calculations and comparison with light scattering measurements... resonance in thin films. By Nicolas Jaouen and J. Goulon. Theory for a dissipative droplet. Gubbiotti "Collective spin excitations in laterally confined magnetic nanostructures" 09:30 - 10:00 talk 2. Chumak "One-dimensional magnonic crystals: design, fabrication and application" 10:00 - 10:30 coffee break. 10:30 - 11:00 talk 3. Kostylev "Partial spin wave bandgap in 1D magnonic crystals" 11:00 - 11:30 talk 4. Giovannini. Spin excitations in nanostructures We focus on spin excitations in two or one dimensional electron systems confined in semiconductors GaAs, CdTe or magnetic semi-conductors CdMnTe. The main technique is resonant electric Raman spectroscopy, however, through collaborations, we investigate time domain measurements of spin excitations by magneto.
Wave modes of collective vortex gyration in dipolar-coupled... - Nature.
Collective spin excitation modes of skyrmions and related chiral magnetic textures have attracted considerable interest over the recent years owing to their strong potential for applications in information processing and microwave devices. The emergence of novel material systems, such as synthetic ferri- and antiferromagnets, the continuing progress in micro- and nanofabrication techniques.
Magnetic skyrmion shape manipulation by perpendicular magnetic.
Two micromagnetic tools to study the spin dynamics are reviewed. Both approaches are based upon the so-called dynamical matrix method, a hybrid micromagnetic framework used to investigate the spin-wave normal modes of confined magnetic systems. The approach which was formulated first is the Hamiltonian-based dynamical matrix method. This method, used to investigate dynamic magnetic properties.
Excitation of coupled oscillations in lateral... - ResearchGate.
Magnonic crystals are artificially periodic magnetic systems where the artificial periodicity modifies the energy spectrum of collective excitations. Frequency dispersion as a function of the Bloch wave vector strictly depends on the periodicity constant and on the interplay between the dipolar and exchange energy stored in collective modes.
Hamiltonian and Lagrangian Dynamical Matrix Approaches Applied to.
Magnetic skyrmions are promising features of spintronic devices including race-track memory and nano-oscillators. Skyrmion shape can act as an additional degree of freedom along with other properties including topological charge, polarity and helicity etc. Skyrmion excitation associated with shape deformation is significant for microwave devices. This experimental evidence has been quantitatively explained by a theoretical model which permits the calculation of the dispersion relation for collective modes in patterned arrays through the.
Access Denied - LiveJournal.
In the quantum formalism, the collective modes of spin excitations in a magnetic solid are referred to as spin waves and their representative quasi-particles are called magnons. The word magnon is chosen in analogy to the quantized lattice vibrations, named phonons. Similar to phonons, plasmons, excitons, magnons are also bosons. EXCITATION OF SPIN-WAVE MODES WITH A the STI field produced by the direct current can be calculated DIRECT CURRENT with the torque equation In this section, we consider the driving of the noninteract- dSi = − ␥Si ⫻ H. 共28兲 ing spin-wave system in a thin FM film by the passage of a dt spin-polarized direct current. Here, we review recent experimental efforts exploring efficient spin Hall detector materials as well as new approaches to drive collective magnetization dynamics and to manipulate spin textures by SHEs. As a result, these studies are also expected to impact practical spintronics applications beyond their significance in fundamental research.
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