Visualization and topography of the stray magnetic field of crack-type discontinuities in magnetic materials
Source abstract
Abstract
Configurations of the domain structure of gadolinium-cobalt amorphous films placed in spatially nonuniform magnetic fields, which are produced by cracks in steel plates, are determined. The possibility of visualization and topography of the stray fields (their normal H z component) of cracks with openings 1.5 to 50 µm wide by the use of an applied magnetic field is shown. Strip domains, which determine the coordinates of edges of cracks with an opening width d > 20 µm (or peaks in the coordinate dependences), are formed near the saturation state under the action of the field. This result is in agreement with calculated theoretical topograms. An unusual discrepancy in the positions of peaks in experimental and theoretical topograms is observed for narrow cracks (d < 10 µm). It is likely that the observed discrepancy in the position of peaks in topograms of narrow cracks is related to the interaction of crack edges during their convergence, i.e., their partial mutual magnetization reversal.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnetic Properties and Applications · Magnetic Field Sensors Techniques · Electromagnetic Effects on Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (6)
Show source-provided references
1. Demin, V.P., Demin, A.P., Mironov, V.B., and Pokrovskii, A.D., Magnetic Films with a Controlled Domain Structure Applied for Detecting Fatigue Failure, Defektoskopiya, 1991, no. 3, pp. 39–43.
2. Chervonenkis, A.Ya. and Kubrakov, N.F., Magneto-Optical Visualization and Topographization of Magnetic Fields, Pis’ma Zh. Tekh. Fiz., 1982, vol. 8, no. 11, pp. 696–699.
3. Gobov, Yu.L. and Taluts, A.G., Formation of Magnetic Domain Structures with Various Topologies Reflecting the Spatial Distribution of Magnetic Field, Defektoskopiya, 1997, no. 12, pp. 41–48.
4. Randoshkin, V.V., Gusev, M.Yu., et al., Visualization of “Cracks” in Steel Using Ferrite-Garnet Magneto-Optical Films with Easy-Plane Anisotropy, Defektoskopiya, 2000, no. 7, pp. 29–31 [Rus. J. of Nondestructive Testing (Engl. Transl.), 2000, vol. 36, no. 7, p. 486].10.1007/BF02759429 ↗
5. Ivanov, V.E. and Kandaurova, G.S., Visualization of Nonuniform Magnetic Fields Using the Domain Structure of Gadolinium-Cobalt Amorphous Films, Trudy XIX mezhdunarodnoi shkoly-seminara, NMMM (Proc. of XIX Inter. School-Symposium NMMM), Moscow, pp. 815–817.
6. Andreev, A.K. and Raev, V.K., The Field of Controlling Permalloy Applications for Magnetic Bubble Domain Propagation Circuits, Logich. Zapomin. Ustroistva Magn. Kristal., 1973, no. 32.