Abstract
We study the spin dynamics in two variants of the high-anisotropy nanomagnet by inelastic neutron scattering, magnetic resonance spectroscopy and magnetometry. We show that a giant-spin picture is completely inadequate for these systems and that excited multiplets play a key role in determining the effective energy barrier for the magnetization reversal. Moreover, we demonstrate the occurrence of tunneling processes involving pair of states having different total spin.
- Received 28 November 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.157203
©2008 American Physical Society