论文标题
Gadolinium作为单个分子磁体中的单个原子催化剂
Gadolinium as a single atom catalyst in a single molecule magnet
论文作者
论文摘要
富勒烯是用于磁性研究的理想纳米构造。用gadolinium替代Dy2scn@c80中的Dimagnetic Scandium Atom降低了给定磁化的稳定性，并证明GD充当单个原子催化剂，可加速热能平衡。 GD和DY的M4,5边缘处的X射线磁圆二色性表明，GD磁矩遵循两个Dy离子的外部和偶极磁场的总和，并与Dy2Scn@C80相比，在铁磁和抗fifermagnetic Dy构型中发现了下部交换屏障。通过超导量子干扰装置磁力测定法获得的Arrhenius平衡屏障较大一个数量级，尽管较小的先前因素在DY2GDN@C80中施加了更快的平衡。这阐明了角动量平衡在磁性松弛中的重要性。
Endohedral fullerenes are perfect nanolaboratories for the study of magnetism. The substitution of a diamagnetic scandium atom in Dy2ScN@C80 with gadolinium decreases the stability of a given magnetization and demonstrates Gd to act as a single atom catalyst that accelerates the reaching of thermal equilibrium. X-ray magnetic circular dichroism at the M4,5 edges of Gd and Dy shows that the Gd magnetic moment follows the sum of the external and the dipolar magnetic field of the two Dy ions and compared to Dy2ScN@C80 a lower exchange barrier is found between the ferromagnetic and the antiferromagnetic Dy configuration. The Arrhenius equilibration barrier as obtained from superconducting quantum interference device magnetometry is more than one order of magnitude larger, though a much smaller prefactor imposes faster equilibration in Dy2GdN@C80. This sheds light on the importance of the angular momentum balance in magnetic relaxation.
