2005/05/13 by Yongqing Li, Peng Xiong, Stephan von Molnar +4 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Magnetic Properties and Applications #Magnetic properties of thin films #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.71.214425
6 pages, 6 figures, to appear in Phys. Rev. B (2005)
arxiv created 2005/05/13 · openalex publication_date 2005/06/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Magnetization reversal of individual, isolated high-aspect-ratio Fe nanoparticles with diameters comparable to the magnetic exchange length is studied by high-sensitivity submicron Hall magnetometry. For a Fe nanoparticle with diameter of 5\phantom\rule0.3em0exnm, the magnetization reversal is found to be an incoherent process with localized nucleation assisted by thermal activation, even though the particle has a single-domain static state. For a larger elongated Fe nanoparticle with a diameter greater than 10\phantom\rule0.3em0exnm, the inhomogeneous magnetic structure of the particle plays important role in the reversal process.