Magnetic force microscopy studies in bulk polycrystalline iron

Abuthahir, J.; Kumar, Anish

doi:10.1016/j.jmmm.2017.06.107

Cited by 8 publications

(2 citation statements)

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“…Hetherington et al [35] pointed out that the domain configuration also depends on the domain wall orientation with respect to the lamellae. Moreover, magnetization discontinuities across the α-Fe3C interfaces generate surface magnetic free poles, causing demagnetizing effects [36,37]. Hence, cementite may be considered as a magnetic inhomogeneity, such as a second-phase precipitate in the ferritic matrix, altering the magnetic behavior In the surface domain pattern of the fully ferritic steel (Figure 6a), magnetic domains exhibit different patterns: stripe domains within some grains, spike, and fine maze type domains in other grains.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

The Influence of Microstructure on the Electromagnetic Behavior of Carbon Steel Wires

et al. 2022

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This paper describes the relations between microstructure, mechanical properties, and electromagnetic behavior of carbon steel wires submitted to different thermomechanical treatments. The electrical resistivity and bulk magnetic properties are determined through resistivity measurements down to 2 K and magnetic hysteresis loop measurements. In addition, magnetic domains are imaged by magnetic force microscopy despite the complex microstructures. The electromagnetic properties are mainly related to changes in the volume fraction, morphology, and distribution of the cementite phase within the α-ferrite matrix. Electrical conductivity and magnetic permeability increase in the order of martensite, tempered martensite, pearlite, proeutectoid ferrite-pearlite, spheroidite, and ferrite microstructures. The increase in carbon concentration enhances the electrons localization at atomic sites, assisting the covalent character of Fe–C interatomic bonds and thereby reducing conductivity. Moreover, the α-Fe3C interfaces that act as a physical barrier for dislocation slip in ferrite, affecting also the main free-paths for conductive electrons and magnetic domain walls displacements within the materials. As the electromagnetic behavior of steels results from individual contributions of microstructural elements that are often intrinsically related to one another, a careful interpretation of both electrical and magnetic responses is critical for a proper application of quality and process monitoring methods of carbon steel wires.

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Section: Magnetic Propertiesmentioning

confidence: 99%

The Influence of Microstructure on the Electromagnetic Behavior of Carbon Steel Wires

et al. 2022

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“…In addition, measurements of domain wall (DW) behavior have an increasing span of applications with capabilities of relatively high spatial resolution measurements of stress statuses in materials [9][10][11][12]. Due to the progress in magnetic domain observation techniques [13][14][15], magnetic microstructure changes in magnetic materials under different external conditions are widely studied [11,12,[16][17][18][19]. Perevertov and Schäfer [17,20] investigated the magnetic domain changes of grain oriented electrical steel under compressive and tensile stress by using magneto-optical Kerr effect microscopy (MOKE).…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic domain wall orientation on Barkhausen noise and magneto-mechanical behavior in electrical steel

Qiu

Jovičević‐Klug

Tian

et al. 2019

J. Phys. D: Appl. Phys.

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We investigate the influence of magnetic domain configurations on the magnetic Barkhausen noise (MBN) and magneto-mechanical behavior of electrical steel. Micro-macro magnetic properties from individual crystallographic grains with different domain wall (DW) orientations under different tensile stresses are measured. We show a strong dependency of the MBN activity and magneto-mechanical behavior on the DW orientation. Time evolution and statics of magnetic domain states are elaborated for the analysis of the magnetization processes, revealing an interaction between the stress-induced demagnetizing effect, the magneto-elastic behavior and the DW dynamics. The variation of supplementary domains under tensile stress is directly connected to the demagnetizing effect, further affecting the MBN activity. In addition, the influence of magnetic domain configurations in the neighboring grains on the DW dynamics and MBN jumps is studied. From this, the dipolar-dipolar and intergranular magnetic coupling interactions are derived. The results provide substantial microscopic insight for MBN and magneto-mechanical behavior analysis.

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