Improvements in the demonstration of the hysteresis loops of ferromagnetic materials

1987 ◽  
Vol 55 (10) ◽  
pp. 933-937 ◽  
Author(s):  
Yunchi Meng ◽  
Zhujian Liang
Keyword(s):  
Hysteresis Loops ◽  
Ferromagnetic Materials

scholarly journals Examining Ferromagnetic Materials Subjected to a Static Stress Load Using the Magnetic Method

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3455
Author(s):  
Tomasz Chady ◽  
Ryszard Łukaszuk
Keyword(s):  
Statistical Analysis ◽  
Measurement System ◽  
Rolling Direction ◽  
Hysteresis Loops ◽  
Ferromagnetic Materials ◽  
Static Stress ◽  
Magnetic Method ◽  
Experimental Examination ◽  
Stress Load ◽  
Anisotropic Steel

This paper discusses the experimental examination of anisotropic steel-made samples subjected to a static stress load. A nondestructive testing (NDT) measurement system with a transducer, which enables observation of local hysteresis loops and detection of samples’ inhomogeneity, is proposed. Local hysteresis loops are measured on two perpendicular axes, including one parallel to the rolling direction of the samples. The results confirm that the selected features of the local hysteresis loops provide important information about the conditions of ferromagnetic materials. Furthermore, it is shown that the selected parameters of the statistical analysis of the achieved measurements are beneficial for evaluating stress and fatigue changes induced in the material.

Experimental Study on Electro-Magneto-Mechanical Behaviour of Electromagnetic Solids

2006 ◽  
Vol 326-328 ◽  
pp. 5-12
Author(s):  
Dai Ning Fang ◽  
Xu Jun Zhao ◽  
Yong Mao Pei ◽  
Zhan Wei Liu ◽  
Fa Xin Li ◽  
...  
Keyword(s):  
Electromagnetic Coupling ◽  
Hysteresis Loops ◽  
Correlation Method ◽  
Strain Curve ◽  
Ferromagnetic Materials ◽  
Ferroelectric Ceramics ◽  
Uniform Electric Field ◽  
Technical Problems ◽  
Digital Speckle Correlation Method ◽  
Electromagnetic Solids

New experiment systems that can offer electromechanical and electromagnetic coupling loads were established. Measurement skills and technologies under coupling loads have been developed. The experimental difficulties and technical problems, such as insulation, discharge, compressive testing of brittle ferroelectrics and so on, were well resolved. The constitutive experiments of piezo/ferroelectrics or ferromagnetic materials were carried out. Moiré Interferometry was applied to the measurement of transformation of the crack tip in ferroelectric ceramics under coupling loads. The deformation concentration near the internal electrode tip caused by non-uniform electric field was investigated by means of Digital Speckle Correlation Method (DSCM). With an aim to accomplish both measurements of constitutive response of the magnetostrictive materials and the fracture experiments of general soft ferromagnetic materials, a magnetomechanical-coupling testing setup was established, which is controlled by an industrial PC. The software was programmed to monitor the testing process and to deal with the acquired data. The characteristic curves of ferromagnetic materials, such as TbxDy1-xFe2 alloys, were measured, including the hysteresis loops, the magnetostriction curve and stress-strain curve.

Sensorless evaluation of asymmetric hysteresis loops of ferromagnetic materials

2003 ◽  
Vol 52 (3) ◽  
pp. 846-851 ◽  
Author(s):  
L. Cristaldi ◽  
A. Ferrero ◽  
M. Lazzaroni ◽  
A.P. Morando
Keyword(s):  
Hysteresis Loops ◽  
Ferromagnetic Materials

Micromagnetic Simulation of Size Effects on the Properties of Ferromagnetic Materials

2007 ◽  
Vol 334-335 ◽  
pp. 1125-1128
Author(s):  
Ra Loon Hu ◽  
Ai Kah Soh
Keyword(s):  
Characteristic Length ◽  
Hysteresis Loops ◽  
Magnetic Behavior ◽  
Ferromagnetic Materials ◽  
External Stress ◽  
Micromagnetic Simulation ◽  
Fast Fourier Transformation ◽  
Bulk Materials ◽  
Magnetization State ◽  
Equilibrium Magnetization

Micromagnetic simulation was carried out to investigate the behavior of ferromagnetic materials at a very small length scale, at which the materials usually exhibit different properties compared with those of the corresponding bulk materials. By solving the time and spatial dependent Landau-Lifshitz-Gilbert (LLG) equation in reciprocal space using fast Fourier transformation (FFT) technique, the equilibrium magnetization state was, thus, achieved. The hysteresis loops were also simulated, from which the relation of coercivity and characteristic length was established. Besides, the effect of external stress on coercivity was also taken into consideration. The results showed that at such length scales the external stress strongly affected the magnetic behavior of ferromagnetic materials.

scholarly journals Modeling plastic deformation effect on the hysteresis loops of ferromagnetic materials based on modified Jiles-Atherton model

2017 ◽  
Vol 66 (10) ◽  
pp. 107501
Author(s):  
Liu Qing-You ◽  
Luo Xu ◽  
Zhu Hai-Yan ◽  
Han Yi-Wei ◽  
Liu Jian-Xun
Keyword(s):  
Plastic Deformation ◽  
Hysteresis Loops ◽  
Ferromagnetic Materials ◽  
Deformation Effect

Nondestructive Inspection of Ductile Cast Iron by Measurement of Minor Magnetic Hysteresis Loops

2010 ◽  
Vol 659 ◽  
pp. 355-360
Author(s):  
Gábor Vértesy ◽  
Tetsuya Uchimoto ◽  
Toshiyuki Takagi ◽  
Ivan Tomáš
Keyword(s):  
Cast Iron ◽  
Structural Changes ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Adaptive Testing ◽  
Ferromagnetic Materials ◽  
Ductile Cast Iron ◽  
Magnetic Hysteresis Loops ◽  
Magnetic Adaptive Testing ◽  
Non Destructive

Systematic measurement of minor magnetic hysteresis loops of traditional hysteresis tests requires substantially lower magnetization of samples and offers higher sensitivity of detection of changes in the ferromagnetic materials’ microstructure. The keynote idea of this method, called Magnetic Adaptive Testing (MAT) is utilization of sensitive correlations between the varied microstructure of the magnetized material and the corresponding, highly sensitive modifications of some of the minor hysteresis loops. The paper presents some of the recent results of the MAT measurement performed on specially prepared series of cast iron samples. Results of the non-destructive magnetic tests were compared with the destructive mechanical measurements of Brinell hardness and linear correlation was found between them. A very good correlation was also found between magnetic descriptors and conductivity and chill/ferrite area fraction. Based on these results, Magnetic Adaptive Testing is suggested as a highly promising non-destructive method for monitoring structural changes in different types of ferromagnetic materials.

scholarly journals Mагнитные и диэлектрические свойства мультиферроиков (1-x)BiFeO-=SUB=-3-=/SUB=--xYMnO-=SUB=-3-=/SUB=-

2019 ◽  
Vol 45 (7) ◽  
pp. 21
Author(s):  
В.И. Михайлов ◽  
В.Т. Довгий ◽  
А.И. Линник ◽  
З.Ф. Кравченко ◽  
В.И. Каменев ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Magnetic Fields ◽  
Solid Solutions ◽  
Coercive Field ◽  
Hysteresis Loops ◽  
Ferromagnetic Materials ◽  
Ceramic Samples ◽  
Weak Magnetic Fields ◽  
Soft Ferromagnetic

AbstractMagnetic hysteresis loops obtained in the fields from 0 to ±2.5 kOe and dielectric permittivity ε (at 1 kHz, 1 MHz, and 8.3 GHz) of (1 – x )BiFeO_3– x YMnO_3 composite multiferroics (0 ≤ x ≤ 0.5) were studied. Ceramic samples of solid solutions were made by the nitrate process. Compositions (1 – x )BiFeO_3– x YMnO_3 with 0.1 ≤ x ≤ 0.5 were found to be soft ferromagnetic materials sensitive to weak magnetic fields. Coercive field H _ c is about 20–32 Oe for these samples. The maximal magnetization was observed in the sample having x = 0.35. For the samples with 0 ≤ x ≤ 0.4 at T = 300 K, the permittivity was ε ~ 17.6–248.6 at the frequency of 1 kHz, 7.8–63.2 at 1 MHz, and 4 ± 0.3 at 8.3 GHz.

PHENOMENOLOGY OF BARKHAUSEN EFFECT IN SOFT FERROMAGNETIC MATERIALS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1907-C8-1908 ◽  
Author(s):  
B. Alessandro ◽  
G. Bertotti ◽  
A. Montorsi
Keyword(s):  
Ferromagnetic Materials ◽  
Barkhausen Effect ◽  
Soft Ferromagnetic
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