SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 99: Gerhard Ertl Young Investigator Award: Finalists session
O 99.1: Vortrag
Donnerstag, 4. März 2021, 13:30–14:00, R1
Magnetic resonance imaging in a scanning tunneling microscope — •Philip Willke1,2,3,4, Aparajita Singha2,3, Xue Zhang2,3, Kai Yang4, Yujeong Bae2,3,4, Taner Esat2,3, Christopher Lutz4, Andreas Heinrich2,3, and Taeyoung Choi2,3 — 1Karlsruhe Institute of Technology, Physikalisches Institute, Karlsruhe, Germany — 2IBS Center for Quantum Nanoscience, Seoul, Republic of Korea — 3Ewha Womans University, Seoul, Republic of Korea — 4IBM Almaden Research Center, San Jose, USA
Combining electron spin resonance (ESR) with scanning tunneling microscopy (STM) allowed for spin resonance experiments on individual atoms on surfaces[1], for remote sensing of atomic spins[2] and for accessing the nuclear spin of single atoms in an STM[3]. In this talk, we focus on the interaction of the atomic spin system on the surface with the magnetic STM tip. We show that the tip field allows to tune the system into resonance similar to the external magnetic field, and can even fully replace the latter[4]. By utilizing this tip magnetic field, we establish magnetic resonance imaging of single atoms[5], exceeding the spatial resolution of other scanning field-gradient techniques by one to two orders of magnitude. We find that MRI scans of different atomic species and with different probe tips lead to unique resonance images revealing the magnetic interaction between tip and atom. [1] Baumann et al., Science, 350, 417-420 (2015). [2] Choi et al., Nat. Nano 12, 420-424(2017). [3] Willke et al., Science 362, 336-339 (2018) [4] Willke, Singha, Zhang et al., Nano Lett. 19, 8201-8206 (2019) [5] Willke et al. Nat. Phys. 15, 1005-1010 (2019).