We study the spin dynamics in two variants of the high-anisotropy Mn6 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 S 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.
Breakdown of the Giant Spin Model in the Magnetic Relaxation of the Mn6 Nanomagnets / Carretta, Stefano; T., Guidi; Santini, Paolo; Amoretti, Giuseppe; O., Pieper; B., Lake; J., VAN SLAGEREN; F., EL HALLAK; W., Wernsdorfer; H., Mutka; M., Russina; C. J., Milios; AND E. K., Brechin. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 100:(2008), pp. 157203-1-157203-4. [10.1103/PhysRevLett.100.157203]
Breakdown of the Giant Spin Model in the Magnetic Relaxation of the Mn6 Nanomagnets
CARRETTA, Stefano;SANTINI, Paolo;AMORETTI, Giuseppe;
2008-01-01
Abstract
We study the spin dynamics in two variants of the high-anisotropy Mn6 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 S 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.| File | Dimensione | Formato | |
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