Breakdown of the giant spin model in the magnetic relaxation of the Mn6 nanomagnets.
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.
Carretta
S
S
Dipartimento di Fisica, Università di Parma, Parma, Italy.
Guidi
T
T
Santini
P
P
Amoretti
G
G
Pieper
O
O
Lake
B
B
van Slageren
J
J
El Hallak
F
F
Wernsdorfer
W
W
Mutka
H
H
Russina
M
M
Milios
C J
CJ
Brechin
E K
EK