THE EFFECTS OF DEMAGNETIZING AND STRAY FIELDS ON MAGNETOACOUSTIC EMISSION
Publication in refereed journal

香港中文大學研究人員

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其它資訊
摘要Magnetoacoustic emission (MAE) has been measured from a Ni bar and a mild steel bar. The magnetizing field was produced by a c-core electromagnet, which was separated from the specimen surface by a nonmagnetic spacer layer (thickness l(a) In Ni, the MAE profile contains a single peak when l(a) is small. As l(a) increases, a second peak appears and then a third peak, indicating that MAE is not only caused by domain wall creation and annihilation, but also by domain wall motion. In the case of the mild steel bar, only two peaks are detected, which are increasingly separated as l(a) increases. The different results between the two materials can be explained by the different mobility of non-180-degrees domain walls. The present results also indicate that the MAE profile obtained from Ni is less sensitive to l(a) than that obtained from mild steel. This difference can be explained by considering the reluctance of the magnetic circuit.
著者NG DHL, LO CCH, JABUBOVICS JP
會議名稱38th Annual Conference on Magnetism and Magnetic Materials (MMM 93)
會議開始日15.11.1993
會議完結日18.11.1993
會議地點MINNEAPOLIS
期刊名稱Journal of Applied Physics
出版年份1994
月份5
日期15
卷號75
期次10
出版社AMER INST PHYSICS
頁次7009 - 7011
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

上次更新時間 2021-25-02 於 02:17