We report the development of a continuous-wave and pulsed X-band electron spin resonance (ESR) spectrometer for the study of spins on ordered surfaces down to cryogenic temperatures. The spectrometer operates in ultra-high vacuum and utilizes a half-wavelength microstrip line resonator realized using epitaxially grown copper films on single crystal Al2O3 substrates. The one-dimensional microstrip line resonator exhibits a quality factor of more than 200 at room temperature, close to the upper limit determined by radiation losses. The surface characterizations of the copper strip of the resonator by atomic force microscopy, low-energy electron diffraction, and scanning tunneling microscopy show that the surface is atomically clean, flat, and single crystalline. Measuring the ESR spectrum at 15 K from a few nm thick molecular film of YPc2, we find a continuous-wave ESR sensitivity of 2.6 × 1011 spins/G · Hz1/2, indicating that a signal-to-noise ratio of 3.9 G · Hz1/2 is expected from a monolayer of YPc2 molecules. Advanced pulsed ESR experimental capabilities, including dynamical decoupling and electron-nuclear double resonance, are demonstrated using free radicals diluted in a glassy matrix.
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June 2024
Research Article|
June 12 2024
A continuous-wave and pulsed X-band electron spin resonance spectrometer operating in ultra-high vacuum for the study of low dimensional spin ensembles Available to Purchase
Franklin H. Cho
;
Franklin H. Cho
(Conceptualization, Data curation, Formal analysis, Methodology, Software, Supervision, Visualization, Writing – original draft, Writing – review & editing)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
2
Ewha Womans University
, Seoul 03760, South Korea
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Juyoung Park;
Juyoung Park
(Data curation, Methodology, Visualization)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
3
Department of Physics, Ewha Womans University
, Seoul 03760, South Korea
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Soyoung Oh;
Soyoung Oh
(Data curation, Methodology, Visualization)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
3
Department of Physics, Ewha Womans University
, Seoul 03760, South Korea
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Jisoo Yu
;
Jisoo Yu
(Data curation, Methodology, Visualization)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
3
Department of Physics, Ewha Womans University
, Seoul 03760, South Korea
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Yejin Jeong;
Yejin Jeong
(Data curation, Methodology, Visualization)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
3
Department of Physics, Ewha Womans University
, Seoul 03760, South Korea
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Luciano Colazzo
;
Luciano Colazzo
(Data curation, Methodology, Resources, Visualization)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
2
Ewha Womans University
, Seoul 03760, South Korea
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Lukas Spree
;
Lukas Spree
(Methodology, Resources)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
2
Ewha Womans University
, Seoul 03760, South Korea
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Caroline Hommel
;
Caroline Hommel
(Resources)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
2
Ewha Womans University
, Seoul 03760, South Korea
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Arzhang Ardavan
;
Arzhang Ardavan
(Conceptualization, Resources, Writing – review & editing)
4
Clarendon Laboratory, Department of Physics, University of Oxford
, Oxford OX1 3PU, United Kingdom
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Giovanni Boero
;
Giovanni Boero
(Conceptualization, Writing – review & editing)
5
Microsystems Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Lausanne 1015, Switzerland
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Fabio Donati
Fabio Donati
a)
(Conceptualization, Formal analysis, Methodology, Supervision, Writing – review & editing)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
3
Department of Physics, Ewha Womans University
, Seoul 03760, South Korea
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
Franklin H. Cho
1,2
Juyoung Park
1,3
Soyoung Oh
1,3
Jisoo Yu
1,3
Yejin Jeong
1,3
Luciano Colazzo
1,2
Lukas Spree
1,2
Caroline Hommel
1,2
Arzhang Ardavan
4
Giovanni Boero
5
Fabio Donati
1,3,a)
1
Center for Quantum Nanoscience, Institute for Basic Science
, Seoul 03760, South Korea
2
Ewha Womans University
, Seoul 03760, South Korea
3
Department of Physics, Ewha Womans University
, Seoul 03760, South Korea
4
Clarendon Laboratory, Department of Physics, University of Oxford
, Oxford OX1 3PU, United Kingdom
5
Microsystems Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL)
, Lausanne 1015, Switzerland
a)Author to whom correspondence should be addressed: [email protected]
Rev. Sci. Instrum. 95, 063904 (2024)
Article history
Received:
December 02 2023
Accepted:
May 09 2024
Citation
Franklin H. Cho, Juyoung Park, Soyoung Oh, Jisoo Yu, Yejin Jeong, Luciano Colazzo, Lukas Spree, Caroline Hommel, Arzhang Ardavan, Giovanni Boero, Fabio Donati; A continuous-wave and pulsed X-band electron spin resonance spectrometer operating in ultra-high vacuum for the study of low dimensional spin ensembles. Rev. Sci. Instrum. 1 June 2024; 95 (6): 063904. https://doi.org/10.1063/5.0189974
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