A nanocrystalline shield for high precision co-magnetometer operated in spin-exchange relaxation-free regime

Fu, Yang; Sun, Jinji; Ruan, J.; Quan, Wei

doi:10.1016/j.sna.2022.113487

Cited by 19 publications

(5 citation statements)

References 24 publications

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“…In particular, the transverse optical pumping term, which was previously ignored or treated as a constant, is considered as a variable here, and the pumping rate of the probe beam R m is split into the product of the frequency-dependent term K m and the power density I. Then, in order to solve it, the Bloch equation is written in the form of a state equation [18,19]…”

Section: Theoretical Analysis Of the Influence Of The Probe Beam On E...mentioning

confidence: 99%

Probe beam influence on spin polarization in spin-exchange relaxation-free co-magnetometers

Wei

Xing

Zhai

et al. 2023

J. Phys. D: Appl. Phys.

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The spin-exchange relaxation-free (SERF) co-magnetometers have promising applications in both inertial navigation and fundamental physics experiments. However, the ﬂuctuation in the spin polarization caused by the probe beam has a non-negligible inﬂuence on the co-magnetometer signal. In this paper, a theoretical model containing three parameters of the probe beam is established by extending the coupled Bloch equations. Based on this model, the inﬂuences of probe power density on the transient and steady-state response of a SERF co-magnetometer are analyzed. According to the transient response model, a new measurement method for transverse optical pumping of the probe beam is proposed. Then for the steady-state response model, a steady-state error suppression method is suggested by adjusting the degree of circular polarization of the probe beam. Eventually, the suppression method is used to reﬁne the SERF co-magnetometer and achieves a suppression rate of 70.31% in transverse electron spin polarization ﬂuctuations, thus improving the co-magnetometer to a stability of 0.0079°/h. In our knowledge, it is better than what has been reported so far.

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Section: Theoretical Analysis Of the Influence Of The Probe Beam On E...mentioning

confidence: 99%

Probe beam influence on spin polarization in spin-exchange relaxation-free co-magnetometers

Wei

Xing

Zhai

et al. 2023

J. Phys. D: Appl. Phys.

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“…Nanocrystalline alloys have the advantages of low coercivity, low losses, high saturation magnetic induction strength, and high permeability [3][4][5][6]. In recent years, amorphous and nanocrystalline alloys have extensively used in transformers, mutual inductors, magnetic shielding, electromagnetic switches and other fields [7][8][9][10]. In the application of nanocrystalline alloys, their inherent nonlinear hysteresis characteristics will have a momentous impact on the electromagnetic field, excitation current and energy loss of power equipment.…”

Section: Introductionmentioning

confidence: 99%

Hysteresis and loss characteristics of Fe-based nanocrystalline alloys based on a novel variable-temperature dynamic Jiles–Atherton hysteresis model

Xu,

Zhao,

Ren

et al. 2023

J. Phys. D: Appl. Phys.

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The magnetic characteristics of Fe-based nanocrystalline alloys can be influenced by temperature. The conventional dynamic Jiles–Atherton (J-A) hysteresis model does not take into consideration the impact that temperature has on magnetic characteristics. A novel variable-temperature dynamic J-A hysteresis model is proposed in this paper to effectively address the issue. Firstly, the hysteresis loops of Fe-based nanocrystalline are measured at −50 °C–130 °C and DC state. The five parameters of the J-A hysteresis model are identified at various temperatures using the particle swarm optimization algorithm, and five parameters are fitted as functions of temperature. Subsequently, the five parameters as functions of temperature are introduced into the conventional dynamic J-A hysteresis model to construct a novel variable-temperature dynamic J-A hysteresis model, which can not only reflect the impact of temperature but also accurately calculate the losses. Finally, hysteresis loops and losses of Fe-based nanocrystalline alloy are simulated and calculated at different temperatures and frequencies by the variable-temperature dynamic J-A hysteresis model. Meanwhile, this paper also investigates the trends and percentages of hysteresis loss, excess loss as well as eddy current loss with frequency and temperature. Compared to the results of measured data, the maximum average error of the variable-temperature dynamic J-A hysteresis model is 5.83%.

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“…Bevan employed square ferrite magnetic shielding in 2018 to reduce the magnetic noise level of the NMR gyroscope [ 19 ]. In addition, low-noise ferrite shielding is utilized in several high-sensitivity atomic sensors and measurement techniques, such as co-magnetometer [ 20 , 21 ], demonstrating its superior performance.…”

Section: Introductionmentioning

confidence: 99%

A High-Performance Magnetic Shield with MnZn Ferrite and Mu-Metal Film Combination for Atomic Sensors

Fang

Sun

et al. 2022

Materials

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This study proposes a high-performance magnetic shielding structure composed of MnZn ferrite and mu-metal film. The use of the mu-metal film with a high magnetic permeability restrains the decrease in the magnetic shielding coefficient caused by the magnetic leakage between the gap of magnetic annuli. The 0.1–0.5 mm thickness of mu-metal film prevents the increase of magnetic noise of composite structure. The finite element simulation results show that the magnetic shielding coefficient and magnetic noise are almost unchanged with the increase in the gap width. Compared with conventional ferrite magnetic shields with multiple annuli structures under the gap width of 0.5 mm, the radial shielding coefficient increases by 13.2%, and the magnetic noise decreases by 21%. The axial shielding coefficient increases by 22.3 times. Experiments verify the simulation results of the shielding coefficient of the combined magnetic shield. The shielding coefficient of the combined magnetic shield is 16.5%. It is 91.3% higher than the conventional ferrite magnetic shield. The main difference is observed between the actual and simulated relative permeability of mu-metal films. The combined magnetic shielding proposed in this study is of great significance to further promote the performance of atomic sensors sensitive to magnetic field.

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A nanocrystalline shield for high precision co-magnetometer operated in spin-exchange relaxation-free regime

Cited by 19 publications

References 24 publications

Probe beam influence on spin polarization in spin-exchange relaxation-free co-magnetometers

Probe beam influence on spin polarization in spin-exchange relaxation-free co-magnetometers

Hysteresis and loss characteristics of Fe-based nanocrystalline alloys based on a novel variable-temperature dynamic Jiles–Atherton hysteresis model

A High-Performance Magnetic Shield with MnZn Ferrite and Mu-Metal Film Combination for Atomic Sensors

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