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Ultrahigh sensitivity magnetic field and magnetization measurements with an atomic magnetometer

2010; American Institute of Physics; Volume: 97; Issue: 15 Linguagem: Inglês

10.1063/1.3491215

1520-8842

Hoan Bui Dang, Adam C. Maloof, Michael Romalis,

Cold Atom Physics and Bose-Einstein Condensates

We describe an ultra-sensitive atomic magnetometer using optically-pumped potassium atoms operating in spin-exchange relaxation free (SERF) regime. We demonstrate magnetic field sensitivity of 160 aT/Hz$^{1/2}$ in a gradiometer arrangement with a measurement volume of 0.45 cm$^3$ and energy resolution per unit time of $44 \hbar$. As an example of a new 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/cm$^3$/Hz$^{1/2}$ and temperatures up to 420$^\circ$C.