单顺磁晶体对单分子磁体局域场分布的研究Mn12-acetate晶体表面的DPPH晶体
Study of the local field distribution on a single-molecule magnet-by a single paramagnetic crystal; a DPPH crystal on the surface of an Mn12-acetate crystal
摘要：
本文研究了在阻塞温度（T >> Tb）以上，在很短的时间间隔（~ 10-10 s）内测量的单分子磁体SMM亚表面局部磁场分布。使用局部顺磁探针的电子顺磁共振（EPR）光谱作为一种简单的替代检测方法。选择[Mn_（12）O_（12）（CH_3COO）_（16）（H_2 O）_4]·2CH_3COOH·4 H_2 O（Mn_（12）-acetate）的SMM晶体和2，2-二苯基-1-苦基肼（DPPH）晶体作为顺磁探针。沉积在Mn 12-醋酸盐上的DPPH的EPR谱显示出与不存在SMM晶体的DPPH的谱相比在磁场中额外的加宽和移位。DPPH线宽的额外加宽被认为是两个主要的电子自旋相互作用（偶极和交换）和晶体表面上的局部磁场分布。在SMM表面的局部场的高斯分布的线宽的温度依赖性外推的低温区间（70-5 K）。
英文摘要：
The local magnetic field distribution on the subsurface of a single-molecule magnet crystal, SMM, above blocking temperature (T >> Tb) detected for a very short time interval (~ 10-10 s), has been investigated. Electron Paramagnetic Resonance (EPR) spectroscopy using a local paramagnetic probe was employed as a simple alternative detection method. An SMM crystal of [Mn12O12(CH3COO)16(H2O)4].2CH3COOH.4H2O (Mn12-acetate) and a crystal of 2,2- diphenyl-1-picrylhydrazyl (DPPH) as the paramagnetic probe were chosen for this study. The EPR spectra of DPPH deposited on Mn12-acetate show additional broadening and shifting in the magnetic field in comparison to the spectra of the DPPH in the absence of the SMM crystal. The additional broadening of the DPPH linewidth was considered in terms of the two dominant electron spin interactions (dipolar and exchange) and the local magnetic field distribution on the crystal surface. The temperature dependence of the linewidth of the Gaussian distribution of local fields at the SMM surface was extrapolated for the low temperature interval (70-5 K).
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