Single-molecule magnet [Tb(hfac)3(2pyNO)] (2pyNO = t-butyl 2-pyridyl nitroxide) with a relatively high barrier of magnetization reversal.
The crystallographic analysis of the title compound shows that there are two crystallographically independent molecules in a unit cell. The magnetic study clarified that every molecule behaved as a single-molecule magnet. Two series of the out-of-phase ac susceptibility signals appeared around 10 K even at zero dc field. The activation energies (Δ) for the magnetization reversal were estimated as Δ((1))/k(B) = 39.2(3) K with τ0((1)) = 4.2(4) × 10(-8) s and Δ((2))/k(B) = 36(2) K with τ0((2)) = 4.1(12) × 10(-7) s, where τ0 stands for the pre-exponential factor in the Arrhenius analysis. Magnetic hysteresis was recorded at 1.6 K by means of a pulsed-field technique. The role of exchange coupling is discussed.
Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan. ishi@pc.uec.ac.jp.
Rina
R
Murakami
Takayuki
T
Ishida
Shunsuke
S
Yoshii
Hiroyuki
H
Nojiri