ISSN:
1434-6079
Keywords:
PACS. 07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements - 36.40.Cg Electronic and magnetic properties of clusters - 61.46.+w Clusters, nanoparticles, and nanocrystalline materials
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We present here the first magnetisation measurements on isolated single crystalline Fe-nanoparticles performed with a ballistic Hall micro-magnetometer. The measurements have a sensitivity of and thus provide us the possibility to study the mechanisms of magnetisation reversal in a single nanoparticle. The magnetic properties of the nanoparticles are influenced by their crystal structure and shape, and the presence of an oxide surface layer. They exhibit curling of the magnetic moments, but also a novel hysteresis behaviour. The spin configurations found for the system agree well with numerical calculations based on a Heisenberg Hamiltonian including the exchange and dipole interaction and surface anisotropy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100530050547
Permalink
