Miniature atomic magnetometer integrated with flux concentrators

Griffith, W Clark, Jimenez-Martinez, Ricardo, Shah, Vishal, Knappe, Svenja and Kitching, John (2009) Miniature atomic magnetometer integrated with flux concentrators. Applied Physics Letters, 94 (2). 023502-1-023502-3. ISSN 0003-6951

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High permeability magnetic flux concentrators are used to enhance the sensitivity of an atomic magnetometer operating in the spin-exchange relaxation-free regime. The magnetometer uses a millimeter scale 87Rb vapor cell and either mu-metal or Mn–Zn ferrite flux concentrators. The measured sensitivity gives excellent agreement with calculations of thermal noise from the concentrator material. The mu-metal concentrators allow a sensitivity of 50 fT Hz−1/2, limited by thermal current magnetic noise. The ferrite concentrators are limited by thermal magnetization noise at low frequencies, and reach a sensitivity of 10 fT Hz−1/2 for frequencies above 125 Hz.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Mathematics
Subjects: Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: William Griffith
Date Deposited: 16 Sep 2013 12:51
Last Modified: 03 Jul 2019 01:33

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