Miniature atomic magnetometer integrated with flux concentrators

Griffith, W. Clark; Jimenez-Martinez, Ricardo; Shah, Vishal; Knappe, Svenja; Kitching, John
January 2009
Applied Physics Letters;1/12/2009, Vol. 94 Issue 2, pN.PAG
Academic Journal
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.


Related Articles

  • Microwave permeability of Y-type hexaferrites in zero field. Obol, Mahmut; Vittoria, Carmine // Journal of Applied Physics;9/15/2003, Vol. 94 Issue 6, p4013 

    Investigates the permeability at microwave frequencies of Y-type hexaferrites in zero-magnetic field. Measurement of the permeability and correlation with multidomain and domain-wall resonances in zero-magnetic field; Expression for the starting point which is the free energy of the sample.

  • Ni–Zn ferrite films with high permeability (μ[sup ′]=∼30, μ[sup ″]=∼30) at 1 GHz prepared at 90 °C. Matsushita, N.; Chong, C. P.; Mizutani, T.; Abe, M. // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p7376 

    Ni-Zn ferrite films were prepared by spin-spray ferrite plating method at 90 °C on glass substrates from a reaction solution of FeCl[sub 2](+FeCl[sub 3])+NiCl[sub 2]+ZnCl[sub 2] and an oxidizing solution of NaNO[sub 2] +CH[sub 3]COONH[sub 4]. The complex permeability μ = μ' - i μ'...

  • An approach to the magnetic disaccommodation in Ti-substituted Ba–W hexaferrites. Herna´ndez-Go´mez, P.; de Francisco, C.; Mun˜oz, J. M.; Alejos, O.; Torres, C.; Bercoff, P. G.; Bertorello, H. R. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p6250 

    The relaxation of the initial permeability has been measured in polycrystalline Ti-doped Ba–W hexaferrites with nominal composition BaTi[sub x]Fe[sub 18-x]O[sub 27], with x ranging among x=0 and 0.3. The samples have been sintered at different temperatures in the 1250 °C

  • Analysis of power loss at high frequency for MnZn ferrites. Kawano, T.; Fujita, A.; Gotoh, S. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p6214 

    Frequency dependence of power loss of MnZn ferrite was investigated in relation with the absolute complex permeability, μ[sub a](=μ[sub a]-jμ[sub a][sup ″]), in the frequency range 10 kHz–5 MHz and the temperature range 23–120 °C. Residual loss, P[sub r]...

  • The initial susceptibility of ferrites: A quantitative theory. Bouchaud, J. P.; Zerah, P. G. // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p5512 

    Presents a study that discussed the permeability spectrum of ferrites. Reasons behind the difference between the susceptibility of a demagnetized ferrimagnet and a polarized sample; Analysis of the contribution of the domain wall to the permeability spectrum of ferrites; Influence of the domain...

  • A simple domain model of flux reversal in ferrites. Avery, R. K.; DeFord, J. F.; Kamin, G.; Turner, W. C.; Zentler, J. M. // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p5562 

    Presents a simple domain model of flux reversal in ferrites. Requirement in the design of efficient linear induction accelerators; Assumptions on the magnetization model; Comparison of the model with experimental data.

  • Modelling of the magnetic and magnetostrictive properties of high permeability Mn--Zn ferrites. Szewczyk, R. // Pramana: Journal of Physics;Dec2006, Vol. 67 Issue 6, p1165 

    This paper presents the results of modelling of both magnetic and magnetostrictive properties of high permeability Mn0:51Zn0.44Fe2.05O4 ferrites. The parameters of energy-based Jiles-Atherton-Sablik (J-A-S) model were calculated for each experimental hysteresis loop on the basis of evolutionary...

  • Permeability tensor of magnetized ferrites at microwave frequencies: A comparison between theory and experiment. Mallégol, Stéphane; Quéffélec, Patrick; Le Floc’h, Marcel // Journal of Applied Physics;5/15/2003, Vol. 93 Issue 10, p7471 

    The permeability tensor of partially magnetized ferrites or composite materials, given by a recent mathematical model developed in our laboratory, is compared with measured one over the 50 MHz-6 GHz frequency range. The characterization method used to measure the tensor components μ, κ is...

  • Static and dynamic magnetic properties of Co2Z barium ferrite nanoparticle composites. Li, Z. W.; Chen, L.; Ong, C. K.; Yang, Z. // Journal of Materials Science;Feb2005, Vol. 40 Issue 3, p719 

    The static, dynamic and attenuation properties of Co2Z barium ferrites and Co2Z composites have been studied. The results showed that both static and dynamic magnetic properties are significantly different for large particles and nanoparticles. As compared to large particles, Co2Z nanoparticles...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics