Spin-wave theory
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 ... WebJun 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...
Spin-wave theory
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WebApr 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. WebIn particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including electromagnetic interactions, it describes all spin-1 ⁄ 2 massive particles, called "Dirac particles", such as electrons and quarks for which parity is a symmetry.It is consistent with both the principles of quantum …
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 … WebThe 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 ...
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, … 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.
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 …
cleaning a charcoal grillWebAbstract. The spin-wave theory of antiferromagnets, recently studied by Anderson for the absolute zero of temperature, is examined here for finite temperatures to derive the … cleaner tool for macbookWebIntroduction to Spin Waves 7,058 views Nov 21, 2024 A spin wave is a collective excitation of the electron spin system in a magnetic solid. In this video, the introduction to spin waves is... cleaning aluminum boat with vinegarWebin 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 … cleaning a larry tubeThe simplest way of understanding spin waves is to consider the Hamiltonian $${\displaystyle {\mathcal {H}}}$$ for the Heisenberg ferromagnet: $${\displaystyle {\mathcal {H}}=-{\frac {1}{2}}J\sum _{i,j}\mathbf {S} _{i}\cdot \mathbf {S} _{j}-g\mu _{\rm {B}}\sum _{i}\mathbf {H} \cdot \mathbf {S} _{i}}$$ where J … See more A spin wave is a propagating disturbance in the ordering of a magnetic material. These low-lying collective excitations occur in magnetic lattices with continuous symmetry. From the equivalent quasiparticle point … See more • Magnonics • Holstein–Primakoff transformation • Spin engineering See more • Spin Waves Biennial International Symposium for discussion of the latest advances in fundamental studies of dynamic properties of various magnetically … See more Spin waves are observed through four experimental methods: inelastic neutron scattering, inelastic light scattering (Brillouin scattering, Raman scattering and inelastic See more When magnetoelectronic devices are operated at high frequencies, the generation of spin waves can be an important energy loss mechanism. Spin wave generation … See more cleaning a drained poolWebApr 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 … cleaning a hard drive platterWebMotivated 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 … clean harbors human resources phone number