SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Poster Session VI: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces II
O 81.5: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
An ultra-high vacuum electron spin resonance spectrometer for investigation of magnetic atoms and molecules at surfaces — •Jisoo Yu1,2, Franklin Cho1,2, Luciano Colazzo1,2, Yejin Jeong1,2, Junjie Liu3, Arzhang Ardavan3, Giovanni Boero4, Andreas Heinrich1,2, and Fabio Donati1,2 — 1Center for Quantum Nanoscience (QNS), Insititute for Basic Science (IBS), Seoul, Republic of Korea — 2Department of Physics, Ewha Womans Universitiy, Seoul, Republic of Korea — 3The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK — 4Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory for Microsystems, Lausanne, Switzerland
Magnetic atoms and molecules on surfaces are model systems to control and manipulate quantum coherence properties at the smallest scale of matter. Their performances as qubits can be investigated through electron spin resonance (ESR) spectroscopy [Nat. Chem. 11, 301(2019)]. However, commercial spectrometers do not meet the requirements of ultra-high vacuum (UHV) and surface-sensitivity to measure a single layer of surface-adsorbed spin centers. We present an UHV ESR spectrometer that enables us to measure thin molecular films in a wide range of temperature (2.5-300 K) and magnetic field (0-3.2 T). This spectrometer operates in the X-band (10 GHz) both in continuous wave (CW) and pulsed mode. To maximize the microwave field on a 2D spin system we deposited the molecular layer directly on the resonator surface. We demonstrate sensitivity of 1012 spins/G*Hz in CW, which allows ESR measurements down to a single layer of molecular spins.