An improved micro-SQUID technique is presented allowing us to measure the temperature dependence of the magnetisation switching fields of single nanoparticles well above the critical superconducting temperature of the SQUID. Our first measurements on 3 nm cobalt nanoparticle embedded in a niobium matrix are compared to the Neel Brown model describing the magnetisation reversal by thermal activation over a single anisotropy barrier.
@article{arxiv.cond-mat/0106112,
title = {Micro-SQUID technique for studying the temperature dependence of switching fields of single nanoparticles},
author = {C. Thirion and W. Wernsdorfer and M. Jamet and V. Dupuis and P. Melinon and A. Perez and D. Mailly},
journal= {arXiv preprint arXiv:cond-mat/0106112},
year = {2009}
}
Comments
3 pages, 4 figures; conference proceeding: 1st Joint European Magnetic Symposia (JEMS'01), Grenoble (France), 28th August - 1st September, 2001