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 nm, 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 nm, the inhomogeneous magnetic structure of the particle plays important role in the reversal process.
@article{arxiv.cond-mat/0505356,
title = {Magnetization Reversal in Elongated Fe Nanoparticles},
author = {Yongqing Li and Peng Xiong and Stephan von Molnar and Yuzo Ohno and Hideo Ohno},
journal= {arXiv preprint arXiv:cond-mat/0505356},
year = {2009}
}
Comments
6 pages, 6 figures, to appear in Phys. Rev. B (2005)