2003/04/28 by E. H. Martins Ferreira, Erlon H. Martins Ferreira, Ferreira, E. H. Martins +5
Engineering · Physics and Astronomy · #Advanced Mathematical Theories and Applications #Characterization and Applications of Magnetic Nanoparticles #FOS: Physical sciences #Quantum Physics (quant-ph) #Quantum and Classical Electrodynamics #quant-ph
paper · pdf · doi:10.48550/arxiv.quant-ph/0304185
5 pages, 2 figures, 1 table
arxiv created 2003/04/28 · openalex publication_date 2003/04/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze the effects of the environment on the spin tunneling process of paramagnetic and superparamagnetic particles and conclude that the non assisted macroscopic tunneling rate is hardly affected in such case, but other more effective (phonon mediated) processes change the magnetization state of the particle. We conclude that for both, paramagnetic and superparamagnetic particles, the decoherence time scale is extremely short (~ 10^(-8..-16)seg), indicating thar coherent tunneling should be strongly suppressed in favor of incoherent tunneling, i.e., the population of higher levels with subsequent decay.