Spin-wave theory

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August undefined, 2024

WebQuantum Condensed Matter Physics: Lecture 8Theoretical physicist Dr Andrew Mitchell presents an advanced undergraduate / introductory Master's level lecture ... WebLinear spin wave theory (LSWT) was rst in-troduced by Bloch [1] and independently by Slater [2]. The description using second quantization of bosonic operators was developed by Holstein and Primako [3] with subsequent theoretical develop-ment by Dyson [4, 5] to described spin-wave inter-actions. The concept of spin waves was a milestone

Spin Waves : Theory and Applications - Google Books

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. WebApr 18, 2014 · Spin wave theory is a key ingredient in our comprehension of quantum spin systems, and is used successfully for understanding a wide range of magnetic phenomena, including magnon condensation and stability of patterns in dipolar systems. Nevertheless, several decades of research failed to establish the validity of spin wave theory rigorously, … highlands battery

Spin Wave Theory of Spin 1/2 XY Model with Ring Exchange on a ...

WebMar 29, 2012 · Solomon A. Owerre. We present the linear spin wave theory calculation of the superfluid phase of a hard-core boson - model with nearest neighbour exchange and four … 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 … WebMay 31, 2024 · Using linear spin-wave theory, we find that our exchange parameters are in reasonably good agreement with inelastic neutron scattering (INS) experiments. … highlands basketball schedule

Spin-Wave Theory Using the Holstein{Primako Transformation

Two-dimensional quantum universality in the spin-1/2 triangular …

WebApr 10, 2024 · The theory of localized spin-wave excitations in random-anisotropy magnets has been developed. Starting with a pure Heisenberg ferromagnet, we study the evolution of standing spin waves in a ... 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 … highlands battery abilityWebApr 29, 2015 · Linear spin wave theory for single-Q incommensurate magnetic structures J Phys Condens Matter. 2015 Apr 29;27 (16):166002. doi: 10.1088/0953-8984/27/16/166002. Epub 2015 Mar 30. Authors S Toth 1 , B Lake Affiliation 1 Laboratory for Neutron Scattering, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland. highlands baseball field location

"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 " - Spin-wave theory

Spin-wave theory

Spin wave propagation in uniform waveguide: effects, modulation …

Webin terms of spin wave theory. Spin waves In ferromagnetic materials the lowest energy of the system occurs when all spins are parallel to each other in the direction of … 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.

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WebMagnetism in solid state physics. Atomic Magnetism. Single ion anisotropy. Dipole-dipole interaction. Spin-orbit coupling (SOC) Inelastic neutron scattering. Magnetic scattering. … 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 ...

WebFeb 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 … 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 …

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. 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.

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 …

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. … how is low fat cheese madeWebThe basic assumption of the spin wave theory is that we can select a classical ground state and determine fluctuations around it. The spin waves dispersions can thus be obtained from different methods, the simplest being probably the linearized classical equations of motion. We shall however rederive these dispersions using Holstein-Primakoff ... how is lower eyelid surgery doneWebJan 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 … highlands battery assessmentWebMar 9, 2024 · Spin Wave Theory. To describe the behavior of magnons and phonons collectively, scientists developed the spin wave theory. With this, phonons and magnons … highlands bay mobile home parkWebSpin wave definition, a magnetic wave propagated through a crystal lattice by a collective excitation of the spin angular momentum of electrons. See more. how is low income determinedWebApr 10, 2024 · The theory of localized spin-wave excitations in random-anisotropy magnets has been developed. Starting with a pure Heisenberg ferromagnet, we study the evolution of standing spin waves in a finite-size sample towards localized modes on increasing the strength of random anisotropy. Profiles of the localized modes and their phases are … highlands battery assessment trainingWebSpin-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, … highlands battery test