The dependence of magnetoacoustic emission on magnetizing frequency in nickel and mild steel
Publication in refereed journal

香港中文大學研究人員

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摘要Magnetoacoustic emission (MAE) measurements have been made on nickel and mild steel samples subjected to a magnetizing field of various frequencies f. In both samples, the MAE signals are found to increase with increasing f. The experimental results are in good agreement with the predictions of a model relating the generation of MAE to domain wall nucleation-annihilation and domain wall motion. When f is large, the contribution of wall motion to the generation of MAE is predicted to be dominant. Conversely, when f is small, MAE is generated mainly by domain wall nucleation-annihilation processes. At high frequencies, the amount of MAE from both nickel and mild steel samples is found to vary linearly with f(0.5). As f decreases, the MAE deviates from the f(0.5) relationship for f < 10 Hz in mild steel, and for f < 2 Hz for nickel. The results suggest that in nickel, wall motion remains the dominant source of MAE generation over a wider frequency range than in steel. (C) 1996 American Institute of Physics.
著者Ng DHL, Yu CC, Qin CD, Lo CCH, Jakubovics JP
會議名稱40th Annual Conference on Magnetism and Magnetic Materials
會議開始日06.11.1995
會議完結日09.11.1995
會議地點PHILADELPHIA
期刊名稱Journal of Applied Physics
出版年份1996
月份4
日期15
卷號79
期次8
出版社AMER INST PHYSICS
頁次6057 - 6059
國際標準期刊號0021-8979
電子國際標準期刊號1089-7550
語言英式英語
Web of Science 學科類別Physics; Physics, Applied; PHYSICS, APPLIED

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