Bias Current Effect on Nonlinear Magnetoimpedance Response in Amorphous Wires with Circular Anisotropy

2009 ◽  
Vol 152-153 ◽  
pp. 329-332
Author(s):  
N.A. Buznikov ◽  
A.S. Antonov ◽  
A.A. Rakhmanov
Keyword(s):  
Skin Effect ◽  
Second Harmonic ◽  
Bias Current ◽  
Voltage Response ◽  
Harmonic Amplitude ◽  
Current Effect ◽  
Rotational Model ◽  
Amorphous Wires ◽  
Field Sensitivity ◽  
Maximum Field

The effect of bias current on the appearance of higher harmonics in the nonlinear mag¬netoimpedance in amorphous wires with a circular anisotropy is studied. The rotational model to calculate the voltage response in the case of a weak skin effect is proposed. It is shown that the ap¬plication of the bias current may lead to significant increase of the second harmonic amplitude in the voltage. The conditions of maximum field sensitivity of the second harmonic are found.

Bias Current Effect on Second Harmonic in Asymmetric Magnetoimpedance Response in Amorphous Microwires

2015 ◽  
Vol 233-234 ◽  
pp. 463-466
Author(s):  
N.A. Buznikov ◽  
A.S. Antonov ◽  
A.B. Granovsky
Keyword(s):  
Second Harmonic ◽  
Bias Current ◽  
Voltage Response ◽  
Harmonic Amplitude ◽  
Current Effect ◽  
Rotational Model ◽  
Field Sensitivity ◽  
Amorphous Microwires ◽  
Maximum Field ◽  
Helical Anisotropy

The influence of bias current on the second harmonic in the nonlinear magnetoimpedance in an amorphous microwire with a helical anisotropy is studied theoretically. The voltage response of the microwire is found in the framework of a rotational model. It is shown that the application of the bias current leads to the asymmetry in the field dependence of second harmonic. The second harmonic amplitude is analyzed as a function of the external field, current amplitude and the value of the bias current. The conditions of maximum field sensitivity of the second harmonic are found.

The effect of domain-walls motion on second harmonic amplitude of magnetoinductive response in Co-based amorphous wires

2005 ◽  
Vol 285 (1-2) ◽  
pp. 101-111 ◽  
Author(s):  
N.A. Buznikov ◽  
A.S. Antonov ◽  
CheolGi Kim ◽  
Chong-Oh Kim ◽  
A.A. Rakhmanov ◽  
...  
Keyword(s):  
Domain Walls ◽  
Second Harmonic ◽  
Harmonic Amplitude ◽  
Amorphous Wires

Nonlinear Ultrasonic Techniques for Testing Micro-Defects in Metal Matrix Composite Structure

2011 ◽  
Vol 483 ◽  
pp. 784-788
Author(s):  
Yi Dun ◽  
Shuan Jie Wang ◽  
Xiao Hong Shi ◽  
Zhao Ying Zhou
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Composite Structure ◽  
Acoustic Waves ◽  
Metal Matrix ◽  
Amplitude Ratio ◽  
Second Harmonic ◽  
Harmonic Amplitude ◽  
Acoustic Features ◽  
Nonlinear Acoustic

Micro-defects inside metal matrix composite structure seriously influence the mechanic properties of materials and can undermine machine operations. In order to detect the micro-defects, we can make use of one of the nonlinear acoustic features, i.e., harmonics, which usually appear together with ultrasound when propagating through a damaged material. Based on the relationship between the harmonics, a method of using nonlinear acoustic harmonic amplitude ratio to distinguish micro-defects in metal matrix composite structure is discussed. The test results show that acoustic features, such as second harmonic excitation efficiency were very obvious for the damaged group samples. The method presented is effective in detecting the micro-defects, which means that nonlinear acoustic waves may provide us a good solution for quantitative evaluation of the early damages in metal matrix composite structure.

Voltage Response of ZnO Varistors to 8/20 µs Surge Current

2007 ◽  
Vol 280-283 ◽  
pp. 285-288 ◽  
Author(s):  
Zhen Ya Lu ◽  
Zhi Wu Chen ◽  
Feng Jin Yang
Keyword(s):  
Skin Effect ◽  
Voltage Response ◽  
Voltage Waveform ◽  
Residual Voltage ◽  
Zno Varistor ◽  
Rlc Circuit ◽  
Rear Part ◽  
Zno Varistors ◽  
Voltage Peak ◽  
Surge Current

The voltage response of ZnO varistors to 8/20 µs surge current was investigated. The observed frontal spikes on the residual voltage waveforms are caused by the ignition gap, and no frontal spike was observed when a thyristor was used as the discharge trigger. The rear part of the waveform is determined by the damping coefficient of the RLC-circuit. Near the critical point, the residual voltage waveform changes from non-oscillating attenuation modes to distinct across zero oscillating modes along with the increase of the peak current, but there will be no oscillation happen when a thyristor is used as the discharge trigger. The residual voltage peak is not synchronized with the current peak, and the voltage peak is leading, implying that the ZnO varistor appears to be inductive. According to the experiment results, it can be reasonably explained that the voltage peak leading phenomenon is attributed to the transient skin effect of the varistor materials.

Amplification of even Harmonics in Nonlinear Magnetoimpedance Response of Amorphous Wires in Presence of Longitudinal Alternating Magnetic Field

2012 ◽  
Vol 190 ◽  
pp. 573-576
Author(s):  
N.A. Buznikov ◽  
A.S. Antonov ◽  
A.A. Rakhmanov
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Magnetization Reversal ◽  
Field Amplitude ◽  
Alternating Magnetic Field ◽  
Voltage Response ◽  
Amorphous Wires ◽  
Reversal Process ◽  
Even Harmonics ◽  
Magnetization Reversal Process

A model to describe the influence of longitudinal alternating magnetic field on the nonli-near magnetoimpedance in amorphous wires is proposed. The appearance of even harmonics in the voltage response is shown to arise from the asymmetry in the magnetization reversal process in the wire due to the presence of the longitudinal alternating field. The behavior of even harmonics is analyzed as a function of the external field, alternating field amplitude and current amplitude.

The effect of helical magnetoelastic anisotropy on magnetoimpedance and its second harmonic component in amorphous wires

2004 ◽  
Vol 271 (2-3) ◽  
pp. 390-395 ◽  
Author(s):  
J.G.S Duque ◽  
C Gómez-Polo ◽  
A Yelon ◽  
P Ciureanu ◽  
A.E.P de Araújo ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Harmonic Component ◽  
Magnetoelastic Anisotropy ◽  
Amorphous Wires
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