Spin-wave theory

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August undefined, 2024

WebApr 18, 2014 · Validity of spin wave theory for the quantum Heisenberg model. Spin wave theory is a key ingredient in our comprehension of quantum spin systems, and is used … WebThis lecture is an introduction to the spin wave theory. We study the cases of a ferromagnet and of an antiferromagnet. We also discuss the use of neutron techniques in measuring …

Spin Waves: Theory and Applications - Electrical and …

WebJan 8, 2024 · In the future, spin waves may be a way to encode magnetic bits in a device without Joule heating. Spin-wave control of magnetization offers many potential … WebDec 9, 2024 · Quantum Spin-Wave Theory and Materials Basic Theory of Spin-Wave. The existence of several major energy terms in micromagnetic theory provides an explanation … huff electric greenwood

Spin waves control the magnetization around them

WebMotivated by recent experiments on thin films of the ferromagnetic insulator yttrium-iron garnet (YIG), we have developed an efficient microscopic approach to calculate the spin-wave spectra of these systems. We model … WebThis rich variety of behavior has led to a number of proposed applications in microwave and optical signal processing. This book begins by introducing magnetism and discusses … WebApr 5, 2009 · Spin Waves: Theory and Applications. Magnetic materials can support propagating waves of magnetization; since these are oscillations in the magnetostatic properties of the material, they are called magnetostatic waves (sometimes “magnons” or “magnetic polarons”). Under the proper circumstances these waves can exhibit, either … huff electric wichita

Spin Waves : Theory and Applications - Google Books

Spin wave - Wikipedia

WebOct 22, 2024 · Hence, to design a computer system that operates entirely with spin waves, spin-wave processors, spin-wave memory, as well as spin-wave interconnects need to be developed. Moreover, interfaces between the spin-wave processor and the outside periphery—presumably charge-based—are required, including a power supply. WebSpin-wave theory refers to any theory in which we nd the magnon dispersion of a ferro-magnet or antiferromagnet by looking at the uctuations about its classical ground state. … huff elementary school huff elementary elgin

"WebJan 1, 2010 · It is referred to as ‘spin-wave theory’ as it gives results for the energies of the elementary excitations or spin waves. The method works for both ferromagnets and … " - Spin-wave theory

Spin-wave theory

WebSpin-wave theory is used to study several model magnetic systems, including non-collinear magnets such as spirals and cycloids that are produced by geometric frustration, competing exchange interactions, or Dzyalloshinskii-Moirya interactions. Several case studies utilizing spin-wave theory to analyze inelastic neutron-scattering and THz ... WebAug 14, 2014 · Generalized spin-wave theory In this section, we consider an arbitrary quantum spin Hamiltonian defined on some lattice. The lattice can be decomposed into a convenient set of units containing a finite number of degrees of freedom. For instance, the unit may be a single site, a dimer, or a trimer.

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WebIn addition, two-dimensional (2D) spin dispersion in the triangular plane was observed in the high-field polarized state, and microscopic exchange parameters of the spin Hamiltonian have been determined through the linear spin wave theory. WebFeb 21, 2012 · We generalize the spin-wave expansion in powers of the inverse spin to time-dependent quantum spin models describing rotating magnets or magnets in time-dependent external fields. We show that in these cases, the spin operators should be projected onto properly defined rotating reference frames before the spin components are bosonized …

WebApr 15, 2024 · This work analyzes the performance of 250 electronic structure theory methods (including 240 density functional approximations) for the description of spin states and the binding properties of iron, manganese, and cobalt porphyrins. The assessment employs the Por21 database of high-level computational data (CASPT2 reference … WebJul 3, 2014 · Effective models explored include Green's function perturbation theory, tight-binding, mean-field theory of Hubbard model, and spin-wave theory. DFT, TDDFT, DFT+U+SOI, HF, TDHF, post-HF (CI). Simulation softwares often used include Gaussian, CRYSTAL, Quantum Espresso, WIEN2K, Octopus, Molpro, and LAMMPS. I have also …

WebQuantum Condensed Matter Physics: Lecture 8Theoretical physicist Dr Andrew Mitchell presents an advanced undergraduate / introductory Master's level lecture ... WebDec 7, 2024 · The calculated spin wave spectra from a linear spin theory yield very large spectral weight above 80 meV (See Supplementary Fig. 3), whereas our data show quite a uniform intensity throughout ...

WebAug 1, 2024 · Spin waves are quantum objects and several phenomena involving them require that they are treated as such. In this chapter, we present a quantum approach of spin waves based on the Holstein–Primakoff transformation from the spin operators into magnon operators.

WebThe most simple spin wave theory is linear spin wave theory[12, 13]. Some nonlin-ear eﬀects, namely essentially the next terms in the expansion of the squareroot, are taken into account in nonlinear spin wave theories[12, 6, 7, 14, 15]. But the Hilbert space on which the spin wave (magnon) operators are deﬁned is much larger than the huff elementaryWebFeb 25, 2014 · Linear spin wave theory provides the leading term in the calculation of the excitation spectra of long-range ordered magnetic systems as a function of . This term is … huff elementary school elginWebJun 24, 2024 · The octahedra supply a crystal field environment that leads to an effective low-energy spin one-half degree of freedom for the magnetic ions and the edge-sharing provides the local exchange... holey moley crown reviewWebSpin-wave theory is used to study several model magnetic systems, including non-collinear magnets such as spirals and cycloids that are produced by geometric frustration, … huff elementary school staffWebJan 19, 2024 · By performing variational mean-field and linear spin-wave theory (LSWT) calculations, we determine that a realistic value of the DM interaction D≈ 2.78 meV is sufficient to quantitatively explain the observed angle between the neighboring spins. huf felixWebMagnetism in solid state physics. Atomic Magnetism. Single ion anisotropy. Dipole-dipole interaction. Spin-orbit coupling (SOC) Inelastic neutron scattering. Magnetic scattering. … huff elementary school wvWebMonumental investigation of kinematical and dynamical interactions of spin waves and of the general validity and thermodynamic consequences of spin-wave theory. The J of this paper equals our 2J. The γ of this paper equals our (a/â) 2. Google Scholar Herring, C., and C. Kittel: On the theory of spin waves in ferromagnetic media. Phys. huff emote