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Single-chip electron spin resonance detectors operating at 50GHz, 92GHz, and 146GHz.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Matheoud Alessandro V, Gualco Gabriele, Jeong Minki, Zivkovic Ivica, Brugger Jürgen, Rønnow Henrik M, Anders Jens, Boero Giovanni,
Project Harnessing Molecular Crystals for Quantum Magnets and Elucidating Quantum Critical Physics
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Original article (peer-reviewed)

Journal Journal of magnetic resonance (San Diego, Calif. : 1997)
Page(s) 113 - 121
Title of proceedings Journal of magnetic resonance (San Diego, Calif. : 1997)
DOI 10.1016/j.jmr.2017.03.013

Open Access

Type of Open Access Repository (Green Open Access)


We report on the design and characterization of single-chip electron spin resonance (ESR) detectors operating at 50GHz, 92GHz, and 146GHz. The core of the single-chip ESR detectors is an integrated LC-oscillator, formed by a single turn aluminum planar coil, a metal-oxide-metal capacitor, and two metal-oxide semiconductor field effect transistors used as negative resistance network. On the same chip, a second, nominally identical, LC-oscillator together with a mixer and an output buffer are also integrated. Thanks to the slightly asymmetric capacitance of the mixer inputs, a signal at a few hundreds of MHz is obtained at the output of the mixer. The mixer is used for frequency down-conversion, with the aim to obtain an output signal at a frequency easily manageable off-chip. The coil diameters are 120μm, 70μm, and 45μm for the U-band, W-band, and the D-band oscillators, respectively. The experimental frequency noises at 100kHz offset from the carrier are 90Hz/Hz(1/2), 300Hz/Hz(1/2), and 700Hz/Hz(1/2) at 300K, respectively. The ESR spectra are obtained by measuring the frequency variations of the single-chip oscillators as a function of the applied magnetic field. The experimental spin sensitivities, as measured with a sample of α,γ-bisdiphenylene-β-phenylallyl (BDPA)/benzene complex, are 1×10(8)spins/Hz(1/2), 4×10(7)spins/Hz(1/2), 2×10(7)spins/Hz(1/2) at 300K, respectively. We also show the possibility to perform experiments up to 360GHz by means of the higher harmonics in the microwave field produced by the integrated single-chip LC-oscillators.