Correlation of Barkhausen jumps and magnetic noise spectrum in ferromagnetic samples having a rectangular hysteresis loop

The detection resolution of a giant magneto-impedance (GMI) sensor is mainly limited by its equivalent input magnetic noise. The noise characteristics of a GMI sensor are evaluated by noise modeling and simulation, which can further optimize the circuit design. This paper first analyzes the noise source of the GMI sensor. It discusses the noise model of the circuit, the output sensitivity model and the modeling process of equivalent input magnetic noise. The noise characteristics of three modules that have the greatest impact on the output noise are then simulated. Finally, the simulation results are verified by experiments. By comparing the simulated noise spectrum curve and the experimental noise spectrum curve, it is demonstrated that the preamplifier and the multiplier contribute the most to the output white noise, and the low-pass filter plays a major role in the output 1/f noise. These modules should be given priority in the optimization of the noise of the conditioning circuit. The above results provide technical support for the practical application of low-noise GMI magnetometers.

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The behavior of rectangular hysteresis loop cores in every application

Proceedings of the IEEE ◽

10.1109/proc.1963.2629 ◽

1963 ◽

Vol 51 (11) ◽

pp. 1578-1584 ◽

Cited By ~ 3

Author(s):

L. Gilli ◽

A.R. Meo

Keyword(s):

Hysteresis Loop ◽

Rectangular Hysteresis Loop

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Rectangular Hysteresis Loop Ferrites with Large Barkhausen Steps

Journal of Applied Physics ◽

10.1063/1.1735424 ◽

1960 ◽

Vol 31 (1) ◽

pp. 85-88 ◽

Cited By ~ 10

Author(s):

Aaron P. Greifer ◽

William J. Croft

Keyword(s):

Hysteresis Loop ◽

Rectangular Hysteresis Loop

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Electronic Surveillance and Security Applications of Magnetic Microwires

10.20944/preprints202101.0055.v1 ◽

2021 ◽

Author(s):

Valentina Zhukova ◽

Paula Corte-Leon ◽

Juan Maria Blanco ◽

Mihail Ipatov ◽

Julian Gonzalez ◽

...

Keyword(s):

Hysteresis Loop ◽

Hysteresis Loops ◽

Electronic Surveillance ◽

Post Processing ◽

Security Applications ◽

Non Linear ◽

Magnetic Softness ◽

Rectangular Hysteresis Loop ◽

Low Dimensionality ◽

Amorphous Microwires

Applications in security and electronic surveillance require combination of excellent magnetic softness with good mechanical and anti-corrosive properties and low dimensionality. We overviewed the properties of soft magnetic glass-coated microwires and different post-processing making them quite attractive for electronic article surveillance and security applications. We studied the magnetostatic interaction between the microwires and routes to tune the non-linear hysteresis loops by using the arrays of different types of amorphous microwires. The presence of neighbouring microwire (either Fe or Co-based) significantly affects the hysteresis loop of the whole microwires array. In a microwires array containing magnetically bistable microwires we observed splitting of the initially rectangular hysteresis loop with a number of Barkhausen jumps correlated with the number of magnetically bistable microwires. Essentially, non-linear and irregular hysteresis loops have been observed in mixed arrays containing Fe and Co-rich microwires. The observed non-linearity in hysteresis loops allowed to increase the harmonics and tune their magnetic field dependencies. Non-linear hysteresis loops have been also observed upon devitrification of amorphous microwires. On the other hand, several routes allowing to tune the switching field by either post-processing or modifying the magnetoelastic anisotropy have been reviewed. Observed unique combination of magnetic properties together with thin dimensions and excellent mechanical and anti-corrosive properties provide excellent perspectives for the use of glass-coated microwires for security and electronic surveillance applications.

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