Work

Atomic free-spin-precession magnetometer for biomagnetic measurements in Earth-range magnetic fields

Year: 2026

Type: article

Abstract: We present an implementation of an atomic magnetometer based on free spin precession of optically pumped Rb 87 atoms. The design features a microfabricated vapor cell with an effective volume of 7.1 mm 3 containing isotopically enriched Rb 87 and nitrogen buffer gas. The magnetometer is designed to operate in the Earth-field range, exhibiting a magnetic noise floor of about 147 fT / Hz at field strengths comparable to Earth's magnetic field, i.e., around 50 μ T . This is in close agreement with the Cramér-Rao lower bound of 118 fT / Hz . The good sensitivity as well as the high dynamic range enables a wide range of applications, including magnetocardiography and geomagnetic measurements.

Source: APS Open Science

DOI: 10.1103/d129-9sdh

Authors: Philipp Neufeld, Janine Riedrich-Möller, Tino Fuchs, Dmitry Budker

Institutions: Robert Bosch (Germany), GSI Helmholtz Centre for Heavy Ion Research, Johannes Gutenberg University Mainz, University of California, Berkeley

Language: English

Topic: Atomic and Subatomic Physics Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W7163880833

FWCI:

Cites: 38

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Related to: 10