Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Chip-scale atomic magnetometer

Published

Author(s)

P Schwindt, Svenja A. Knappe, V Shah, Leo W. Hollberg, John Kitching, Li-Anne Liew, John Moreland

Abstract

Using the techniques of micro-electro-mechanical systems (MEMS), we have constructed a small, low-power magnetic sensor based on alkali atoms. By measuring the energy shift of the atoms' magnetic moment due to a magnetic field via a coherent population trapping resonance, we detect the magnetic flux density with a sensitivity of 50 pT Hz-1/2 at 10 Hz. The magnetic sensor has a size of 12 mm3 and dissipates 195 mW of power. Further improvements in size, power dissipation, and magnetic field sensitivity are immediately foreseeable, and such a device could provide a hand-held, battery-operated magnetometer with an atom shot-noise limited sensitivity of 0.05 pT Hz-1/2.
Citation
Applied Physics Letters
Volume
85
Issue
26

Keywords

atomic sensors, coherent population trapping, magnetometry, MEMS

Citation

Schwindt, P. , Knappe, S. , Shah, V. , Hollberg, L. , Kitching, J. , Liew, L. and Moreland, J. (2004), Chip-scale atomic magnetometer, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50058 (Accessed January 26, 2023)
Created December 26, 2004, Updated October 12, 2021