Frauhammer Timo, Chen Hongyan, Balashov Timofey, Derenbach Gabriel, Klyatskaya Svetlana, Moreno-Pineda Eufemio, Ruben Mario, Wulfhekel Wulf
Physikalisches Institut, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.
Physikalisches Institut, RWTH Aachen, 52074 Aachen, Germany.
Phys Rev Lett. 2021 Sep 17;127(12):123201. doi: 10.1103/PhysRevLett.127.123201.
Rare-earth based single-molecule magnets are promising candidates for magnetic information storage including qubits as their large magnetic moments are carried by localized 4f electrons. This shielding from the environment in turn hampers a direct electronic access to the magnetic moment. Here, we present the indirect readout of the Dy moment in Bis(phthalocyaninato)dysprosium (DyPc_{2}) molecules on Au(111) using milli-Kelvin scanning tunneling microscopy. Because of an unpaired electron on the exposed Pc ligand, the molecules show a Kondo resonance that is, however, split by the ferromagnetic exchange interaction between the unpaired electron and the Dy angular momentum. Using spin-polarized scanning tunneling spectroscopy, we read out the Dy magnetic moment as a function of the applied magnetic field, exploiting the spin polarization of the exchange-split Kondo state.
基于稀土的单分子磁体有望用于包括量子比特在内的磁信息存储，因为它们的大磁矩由局域的4f电子携带。这种对环境的屏蔽反过来阻碍了对磁矩的直接电子访问。在此，我们使用毫开尔文扫描隧道显微镜展示了在金（111）表面的双（酞菁）镝（DyPc₂）分子中镝矩的间接读出。由于暴露的酞菁配体上存在一个未配对电子，这些分子表现出近藤共振，然而，该共振被未配对电子与镝角动量之间的铁磁交换相互作用分裂。利用自旋极化扫描隧道谱，我们通过利用交换分裂近藤态的自旋极化，读出了作为外加磁场函数的镝磁矩。
