Generation of constant-amplitude radio-frequency sweeps at a tunnel junction for spin resonance STM

William Paul; Susanne Baumann; Christopher P. Lutz; Andreas J. Heinrich

doi:10.1063/1.4955446

Generation of constant-amplitude radio-frequency sweeps at a tunnel junction for spin resonance STM

William Paul, Susanne Baumann, Christopher P. Lutz, Andreas J. Heinrich

Department of Physics

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

We describe the measurement and successful compensation of the radio-frequency transfer function of a scanning tunneling microscope over a wide frequency range (15.5-35.5 GHz) and with high dynamic range (>50 dB). The precise compensation of cabling resonances and attenuations is critical for the production of constant-voltage frequency sweeps for electric-field driven electron spin resonance (ESR) experiments. We also demonstrate that a well-calibrated tunnel junction voltage is necessary to avoid spurious ESR peaks that can arise due to a non-flat transfer function.

Original language	English
Article number	074703
Journal	Review of Scientific Instruments
Volume	87
Issue number	7
DOIs	https://doi.org/10.1063/1.4955446
State	Published - 1 Jul 2016

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© 2016 Author(s).

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abstract = "We describe the measurement and successful compensation of the radio-frequency transfer function of a scanning tunneling microscope over a wide frequency range (15.5-35.5 GHz) and with high dynamic range (>50 dB). The precise compensation of cabling resonances and attenuations is critical for the production of constant-voltage frequency sweeps for electric-field driven electron spin resonance (ESR) experiments. We also demonstrate that a well-calibrated tunnel junction voltage is necessary to avoid spurious ESR peaks that can arise due to a non-flat transfer function.",

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AB - We describe the measurement and successful compensation of the radio-frequency transfer function of a scanning tunneling microscope over a wide frequency range (15.5-35.5 GHz) and with high dynamic range (>50 dB). The precise compensation of cabling resonances and attenuations is critical for the production of constant-voltage frequency sweeps for electric-field driven electron spin resonance (ESR) experiments. We also demonstrate that a well-calibrated tunnel junction voltage is necessary to avoid spurious ESR peaks that can arise due to a non-flat transfer function.

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Generation of constant-amplitude radio-frequency sweeps at a tunnel junction for spin resonance STM

Abstract

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