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Azevedo, A.; Aguiar, F.; Rezende, S.
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
AbstractAbstract
[en] Published in summary form only
Original Title
Auto-oscilacoes em instabilidades de ondas de spin
Source
Almeida Fonseca, A.L. de (Brasilia Univ., DF (Brazil)); Koiler, B. (Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)); Brescansin, L.M. (Universidade Estadual de Campinas, SP (Brazil)) (and others); Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 284 p; 1990; p. 121; 13. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of the Comissao Nacional de Energia Nuclear, RJ, Brazil
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Laulicht, I.; Wigen, P.E.
Book of Program and Abstracts of the 45th Annual Meeting of the Israel Physical Society and the Second Conference of the Israel Plasma Science and Technology Association1999
Book of Program and Abstracts of the 45th Annual Meeting of the Israel Physical Society and the Second Conference of the Israel Plasma Science and Technology Association1999
AbstractAbstract
[en] There is a time delay between the switch on of the pumping and the time when parametric excitation of spin waves becomes stationary. This time delay is critically dependent on the pumping field, h, and exhibits a critical slowing down behavior near the threshold field hc. It is very short for pumping fields far beyond the threshold and it approaches infinity as h->h c from above. We name this time delay as the buildup time. Buildup times and stationary values of spin wave excitations near the instability threshold are calculated numerically. The study is done in the framework of the two-mode model. It is shown that if a finite medium correction term is introduced to the equations of motion the threshold of the pumping field amplitude is below γ/ν where ryγ is the spin wave relaxation rate and v ν is the coupling of the spin wave to the pumping field. The time evolution of the excitation may approach the steady state via oscillations that may last for a very long time. The stationary excitation No, and the buildup time τb depend on the pumping power p, and the pumping field h via power laws: No B(p/pc - 1)δ and τb = A(h/hc - 1)-Δ =0.5 for the case of an infinite medium and no de-tuning of the mode frequencies from ωp/2. For modes that are de-tuned from ωp/2, it is 0.37 for an infinite medium and 0.42 for a finite medium. AΔ = 0.98 for the case of an infinite medium and no de-tuning of the mode. For modes that are de-tuned from ωp/2, it is 1.06 for an infinite medium and 0.98 for a finite medium. The power law dependence is consistent with experiments but the numerical results for δ and Δ do not agree with experiments
Source
Israel Physical Society (Israel); 228 p; 18 Mar 1999; p. 30; 45. Annual Meeting of the Israel Physical Society; Tel-Aviv (Israel); 18 Mar 1999; 2. Conference of the Israel Plasma Science and Technology Association; Tel-Aviv (Israel); 18 Mar 1999
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AbstractAbstract
[en] Short communication
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Israel Physical Society, Jerusalem (Israel); Bulletin of the IPS; v. 39; 175 p; Apr 1993; p. 45; Israel physical society 1993 annual meeting; Tel-Aviv (Israel); 4 Apr 1993
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AbstractAbstract
[en] Forbidden magnon scattering from Gd was investigated using polarized neutrons. In contrast to earlier results for itinerant electron ferromagnets, forbidden magnons were not observed for this Heisenberg ferromagnet. This suggests that magnetic short range order is more important in the thermally-induced spin-disordering of the itinerant electron systems
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International Conference on Magnetism; Paris (France); 25-29 Jul 1988; CONTRACT DE-AC05-840R21400
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Journal Article
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Journal de Physique (Les Ulis), Colloque; ISSN 0449-1947;
; CODEN JPQCA; v. 49(C8); p. C8.361-C8.362

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Gonchar, L E, E-mail: l.e.gonchar@urfu.ru2019
AbstractAbstract
[en] The current investigation is devoted to the theoretical study of orbital structure influence upon magnetic subsystem in half-doped charge-ordered manganites. The main interaction of magnetic subsystem is superexchange interaction. It forms spin-wave dispersion dependencies. Because of charge and orbital ordering, there are a lot of superexchange parameters in these compounds. That makes the dispersion rather complicated. This work clarifies some features of dispersion in terms of orbitally-dependent superexchange interactions. (paper)
Secondary Subject
Source
7. Euro-Asian Symposium Trends in Magnetism; Ekaterinburg (Russian Federation); 8-13 Sep 2019; Available from http://dx.doi.org/10.1088/1742-6596/1389/1/012138; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 1389(1); [7 p.]

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AbstractAbstract
[en] The MF-RPA model for H090Tb10, developed previously, is utilized for calculating the c-axis spin-wave energies of Ho. The low-temperature spin waves in the conical and helical phases agree well with the experiments of Stringfellow et al. At higher temperatures the calculations indicate that the hexagonal anisotropy still has appreciable effects on the spin waves, studied experimentally by Nicklow
Primary Subject
Source
International Conference on Magnetism; Paris (France); 25-29 Jul 1988
Record Type
Journal Article
Literature Type
Conference
Journal
Journal de Physique (Les Ulis), Colloque; ISSN 0449-1947;
; CODEN JPQCA; v. 49(C8); p. C8.351-C8.352

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Tkachenko, V.S.; Kruglyak, V.V.; Kuchko, A.N., E-mail: kuchko@dongu.donetsk.ua, E-mail: V.V.Kruglyak@exeter.ac.uk2006
AbstractAbstract
[en] The spectrum of exchange spin waves in a magnonic crystal (periodic magnetic multilayer) with diffuse interfaces is derived for a model with a cosine-like profile of the uniaxial anisotropy value at the interfaces. The dependence of the band gap size upon the interface thickness and the depth of modulation of the anisotropy value is analyzed. In particular, it is shown that diffuse interfaces may lead to a magnonic spectrum in which band gaps have size equal to or even larger than those in the model with sharp (infinitely thin) interfaces (Kronnig-Penney model)
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S0304-8853(06)00667-6; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Heller, P.; Blume, M.
Brandeis Univ., Waltham, Mass. (USA). Dept. of Physics; Brookhaven National Lab., Upton, N.Y. (USA)1977
Brandeis Univ., Waltham, Mass. (USA). Dept. of Physics; Brookhaven National Lab., Upton, N.Y. (USA)1977
AbstractAbstract
[en] A detailed and quantitative study of the low-temperature spin-wave dynamics was made for the classical Heisenberg-coupled chain using computer simulation. Results for the spin-wave damping rates and the renormalization of the spin-wave frequencies are presented and compared with existing predictions
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Nov 1977; 12 p; 23. conference on magnetism and magnetic materials; Minneapolis, MN, USA; 8 - 11 Nov 1977; CONF-771127--11; Available from NTIS., MF A01
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Avella, Adolfo; Di Ciolo, Andrea; Jackeli, George, E-mail: adiciolo@unisa.it
arXiv e-print [ PDF ]2018
arXiv e-print [ PDF ]2018
AbstractAbstract
[en] We study the effects of quantum fluctuations on the dynamical generation of a gap and on the evolution of the spin-wave spectra of a frustrated magnet on a triangular lattice with bond-dependent Ising couplings, analog of the Kitaev honeycomb model. The quantum fluctuations lift the subextensive degeneracy of the classical ground-state manifold by a quantum order-by-disorder mechanism. Nearest-neighbor chains remain decoupled and the surviving discrete degeneracy of the ground state is protected by a hidden model symmetry. We show how the four-spin interaction, emergent from the fluctuations, generates a spin gap shifting the nodal lines of the linear spin-wave spectrum to finite energies.
Source
SCES 2017: International Conference on Strongly Correlated Electron Systems; Prague (Czech Republic); 17-21 Jul 2017; S092145261730755X; Available from http://dx.doi.org/10.1016/j.physb.2017.10.024; Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Amelin, K.; Nagel, University; Fishman, R. S.; Yoshida, Y.; Sim, Hasung
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Funding organisation: USDOE Office of Science - SC, Basic Energy Sciences (BES) (United States); Estonian Ministry of Education and Research (Estonia)2018
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Funding organisation: USDOE Office of Science - SC, Basic Energy Sciences (BES) (United States); Estonian Ministry of Education and Research (Estonia)2018
AbstractAbstract
[en] We measured absorption of THz radiation in YFeO3 single crystals at a temperature of 3 K in the magnetic field up to 17 T applied in all three crystallographic directions. Two spin-wave modes were observed at the Γ point with energies 1.2 meV (9.8 cm–1) and 2.4 meV (19.3 cm–1) in zero field. From the magnetic-field dependence of mode energies, we have refined the previously proposed model [S. E. Hahn et al., Phys. Rev. B 89, 014420 (2014)] and quantified the parameters of Dzyaloshinskii-Moriya interactions and single-ion anisotropies. Authors:
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Secondary Subject
Source
OSTIID--1482150; AC05-00OR22725; Available from https://www.osti.gov/biblio/1482150; DOE Accepted Manuscript full text, or the publishers Best Available Version will be available free of charge after the embargo period
Record Type
Journal Article
Journal
Physical Review B; ISSN 2469-9950;
; v. 98(17); vp

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