Electron paramagnetic resonance spectroscopy using a dc-SQUID magnetometer directly coupled to an electron spin ensemble

Abstract

We demonstrate electron spin polarization detection and electron paramagnetic resonance (EPR) spectroscopy using a direct current superconducting quantum interference device (dc-SQUID) magnetometer. Our target electron spin ensemble is directly glued on the dc-SQUID magnetometer that detects electron spin polarization induced by a external magnetic field or EPR in micrometer-sized area. The minimum distinguishable number of polarized spins and sensing volume of the electron spin polarization detection and the EPR spectroscopy are estimated to be $\sim$$10^6$ and $\sim$$10^{-10}$ ${\mathrm{cm}}^3$ ($\sim$0.1 pl), respectively.

9 pages, 3 figures

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• Strong Coupling of a Spin Ensemble to a Superconducting Resonator
• Scanning nano-SQUID with single electron spin sensitivity
• Towards Realizing a Quantum Memory for a Superconducting Qubit: Storage and Retrieval of quantum states
• Observing electron spin resonance between 0.1 and 67 GHz at temperatures between 50 mK and 300 K using broadband metallic coplanar waveguides
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