SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Poster Session VII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces III
O 95.3: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
Engineering of Fe Spin Excitation on NaCl — •Shinjae Nam1,2, Jinoh Jung1,4, Christoph Wolf1,3, Andreas Heinrich1,2,3, and Jungseok Chae1,3 — 1center for Quantum Nano Science — 2Physics department, Ewha Womans University — 3Ewha Womans University — 4Physics of department, KAIST
For scanning tunneling microscopy (STM) study of single magnetic atoms, a decoupling thin layer of Cu2N and MgO have been widely used to isolate magnetic atoms from the conducting substrate. However, NaCl wasn’t commonly used for single magnetic atom even though it has been widely used for decoupling layer of single organic molecules.
Here, we investigated the electronic and magnetic properties of single Fe atoms absorbed on NaCl thin film on the Au (111) substrate depending on its absorption sites using STM. Notably, the Fe atoms are adsorbed on the interstitial bridge site of NaCl after deposition, while density functional theory (DFT) calculations indicate the Cl-top site as a preference absorption site. We confirmed the dynamic absorption process by atomic manipulation and simulation using DFT calculations. Moreover, Fe on the interstitial bridge shows an apparent step-wise increase at 23 meV, as expected for a spin-excitation. The DFT+multiplet calculation reproduces the spin excitation energy of Fe at the interstitial bridge of 3d7 electronic configuration with spin 3/2. Interestingly, the Fe at interstitial bridge has in-plane magnetic anisotropy due to the large transverse crystal field and its ground spin 1/2 two level system might be utilized as a qubit.