Multilevel model for magnetic deflagration in nanomagnet crystals
(English)Manuscript (preprint) (Other academic)
We extends the existing theoretical model for determining the characteristic features of magnetic deflagration in nanomagnet crystals. The Zeeman energy, the deflagration velocity, and other parameters are computed taking into account all spin energy levels of the molecular magnet. We also consider the effect of a strong transverse magnetic field, and show that the latter significantly modifies the spin-state structure, leading to an uncertainty concerning the activation energy of the spin flipping. We show that taking into account all energy levels reduces the final temperature as well as the Zeeman energy released, affecting the velocity of propagation of the spin-flipping front. The results obtained for the front velocity are in very good agreement with experimental data for a crystal of Mn12-acetate in a longitudinal magnetic field.
Nanomagnets, Zeeman energy, spin avalanches, magnetic deflagration
Research subject Physics Of Matter
IdentifiersURN: urn:nbn:se:umu:diva-124442OAI: oai:DiVA.org:umu-124442DiVA: diva2:952033
FunderSwedish Research Council