title: Cryogenic single-chip electron spin resonance detector.
abstract: We report on the design and characterization of a single-chip electron spin resonance detector, operating at a frequency of about 20 GHz and in a temperature range extending at least from 300 K down to 4 K. The detector consists of an LC oscillator formed by a 200 μm diameter single turn aluminum planar coil, a metal-oxide-metal capacitor, and two metal-oxide-semiconductor field effect transistors used as negative resistance network. At 300 K, the oscillator has a frequency noise of 20 Hz/Hz(1/2) at 100 kHz offset from the 20 GHz carrier. At 4 K, the frequency noise is about 1 Hz/Hz(1/2) at 10 kHz offset. The spin sensitivity measured with a sample of DPPH is 10(8)spins/Hz(1/2) at 300 K and down to 10(6)spins/Hz(1/2) at 4 K.
authors.affiliation: Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Gualco
authors.affiliation: Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: Jens
authors.initials: J
authors.lastname: Anders
authors.affiliation: Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Sienkiewicz
authors.affiliation: Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: Stefano
authors.initials: S
authors.lastname: Alberti
authors.affiliation: Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: László
authors.initials: L
authors.lastname: Forró
authors.affiliation: Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. Electronic address: giovanni.boero@epfl.ch.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Boero
keywords: CMOS; Cryogenic; ESR