Ultrahigh sensitivity magnetic field and magnetization measurements with an atomic magnetometer

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Abstract

We describe an ultrasensitive atomic magnetometer based on optically pumped potassium atoms operating in a spin-exchange relaxation free regime. We demonstrate magnetic field sensitivity of 160 aT/Hz1/2 in a gradiometer arrangement with a measurement volume of 0.45 cm3 and energy resolution per unit bandwidth of 44. As an example of an application enabled by such a magnetometer, we describe measurements of weak remnant rock magnetization as a function of temperature with a sensitivity on the order of 10 -10 emu/cm3/Hz1/2 and temperatures up to 420°C.

Original languageEnglish (US)
Article number151110
JournalApplied Physics Letters
Volume97
Issue number15
DOIs
StatePublished - Oct 11 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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