Simulation of a spin-wave instability from atomistic spin dynamics
2009 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 79, no 18, 184426- p.Article in journal (Refereed) Published
We study the spin dynamics of a Heisenberg model at finite temperature in the presence of an external fieldor a uniaxial anisotropy. For the case of the uniaxial anisotropy, our simulations show that the macromomentpicture breaks down. An effect which we refer to as a spin-wave instability results in a nondissipative Bloch-Bloembergen-type relaxation of the macromoment where the size of the macromoment changes and can evenbe made to disappear. This relaxation mechanism is studied in detail by means of atomistic spin dynamics simulations.
Place, publisher, year, edition, pages
2009. Vol. 79, no 18, 184426- p.
ferromagnetic relaxation, ferromagnetic resonance, Heisenberg model, magnetic anisotropy, magnetic moments, spin dynamics, spin waves
IdentifiersURN: urn:nbn:se:uu:diva-120101DOI: 10.1103/PhysRevB.79.184426ISI: 000266501200079OAI: oai:DiVA.org:uu-120101DiVA: diva2:302504