نتایج جستجو برای: spin wave
تعداد نتایج: 332548 فیلتر نتایج به سال:
Spin dynamics controlled by magnetoelastic coupling and applied electric fields might play a vital role in future developments of magnonics, i.e., the exploitation of spin waves for the transmission and processing of information. We have performed broadband spin-wave spectroscopy on a magnetostrictive CoFeB alloy grown on a ferrolectric BaTiO3 substrate causing elastic strain with a quasi-perio...
The ground-state and low-energy properties of the two-dimensional J1−J2 Heisenberg model in the collinear phase are investigated using finite-size spin-wave theory [Q. F. Zhong and S. Sorella, Europhys. Lett. 21, 629 (1993)], and Lanczos exact diagonalizations. For spin one-half – where the effects of quantization are the strongest – the spinwave expansion turns out to be quantitatively accurat...
Through numerical solution of the time-dependent Schrödinger equation, we demonstrate that magnetic chains with uniaxial anisotropy support stable structures, separating ferromagnetic domains of opposite magnetization. These structures, domain walls in a quantum system, are shown to remain stable if they interact with a spin wave. We find that a domain wall transmits the longitudinal component ...
We report unidirectional transmission of micron-wide spin waves beams in a 55 nm thin YIG. downscaled chiral coupling technique implementing Ni 80 Fe 20 nanowires arrays with different widths and lattice spacing to study the non-reciprocal exchange down λ ≈ nm. A full wave spectroscopy analysis these high wavevector coupled-modes shows some difficulties characterize their propagation properties...
Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd(1-x)Mn(x)Te quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin subbands and a spin polarization is induced in the electron gas. Above 1 T the collective modes, which disperse with the in-plane wave vector, dominate the spectra. The loca...
Using spin-density-functional theory, we study the electronic states of a two-dimensional parabolic quantum dot with up to N = 58 electrons. We observe a shell structure for the filling of the dot with electrons. Hund’s rule determines the spin configuration of the ground state, but only up to 22 electrons. At specific N , the ground state is degenerate, and a small elliptical deformation of th...
We have calculated the electronic structure of Sr2RuO4 using the full potential linearized augmented plane wave method in the spin polarized local density approximation. By this calculation, we identify the contribution of different electronic states near Fermi surface and study some electronic parameters like crystal electric field, exchange splitting, and hybridization between different atoms...
The problem of spin squeezing with a bimodal condensate in the presence of particle losses is solved analytically by the Monte Carlo wave function method. We find the largest obtainable spin squeezing as a function of the one-body loss rate, the two-body and three-body rate constants, and the s-wave scattering length.
Problems of strongly interacting electrons can be greatly simplified by reducing them to effective quantum spin models. The initial step is renormalization of the Hamiltonian into a lower energy subspace. The positive and negative U Hubbard models are explicitly transformed into the Heisenberg and -x-xz models respectively. Basic tools of quantum magnetism are introduced and used: spin coherent...
An inherent element of research and applications in photonics is a beam of light. In magnonics, which is the magnetic counterpart of photonics, where spin waves are used instead of electromagnetic waves to transmit and process information, the lack of a beam source limits exploration. Here, we present an approach enabling generation of narrow spin wave beams in thin homogeneous nanosized ferrom...
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