Affiliation:
1. Institute of Nanoscience and Nanotechnology NCSR Demokritos 15341 Ag. Paraskevi, Attiki Greece
2. Inorganic Chemistry Laboratory Department of Chemistry National and Kapodistrian University of Athens 15571 Athens Greece
Abstract
AbstractIn the work described herein, the spin relaxation properties of the mononuclear tetrahedral S=2 [Fe{(SPiPr2)2N}2] complex (1) were studied by employing static and dynamic magnetic measurements at liquid helium temperatures. In the absence of an external direct current (DC) magnetic field, 1 exhibits fast magnetization relaxation. However, in the presence of external magnetic fields of a few kOe, slow relaxation is induced as monitored by alternating current (AC) magnetic susceptibility measurements up to 10 kHz, in the temperature range 2–5 K. Analysis of the temperature dependence of the corresponding relaxation time reveals contributions by Quantum Tunnelling of Magnetization, and the Direct and Orbach processes in the magnetization relaxation mechanism of 1. The energy barrier, Ueff, of the Orbach process, as determined by this analysis, is compared with that related to the zero‐field splitting parameters of 1 which were previously determined by high‐ frequency and ‐field electron paramagnetic resonance and Mössbauer spectroscopies.