MAGNETIC VISCOSITY AND ACTIVATION VOLUME IN DOMAIN-WALL PINNING
Publication in refereed journal

香港中文大學研究人員

引用次數
替代計量分析
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其它資訊
摘要When domain wall pinning is due to random arrays of inhomogeneities, the dynamical process of unpinning could be described by the weak or the strong domain wall pinning models. Based on these two models, the values of activation volume V-w (for weak pinning) and V-s (for strong pinning) of bowed domain wall of thermally annealed iron-rich FeAu specimens were estimated. The results were then used to calculate their corresponding fluctuation field H-fw (using V-w) and H-fs (using V-s), for each of the specimens. Comparing the values of H-fw and H-fs with the Barbier's plot which relates magnetic viscosity to the coercive field H-o of a wide variety of magnetic materials it was found that H-fw of the low age specimens plotted against their H-o exhibited similar behaviour as in the Barbier's plot. However, when values of H-fs were used in the plotting, similarity with the Barbier's result was only found in specimens after prolonged aging. It is also found that when the localized demagnetizing effect on the bowed portion of the domain wall due to the presence of the surface free-poles is to be considered in the derivation, the fluctuation field is smaller than that without such consideration by a factor of F/2F(o) in the case when the material has a weak pinning regime, where F and F-o are the pinning force per unit area with and without the demagnetizing consideration respectively, and by a factor of 1/4 in the case of strong pinning.
著者NG DHL, LO CCH, GAUNT P
會議名稱6th Joint Magnetism and Magnetic Materials-Intermag Conference
會議開始日20.06.1994
會議完結日23.06.1994
會議地點ALBUQUERQUE
期刊名稱IEEE Transactions on Magnetics
出版年份1994
月份11
日期1
卷號30
期次6
出版社IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
頁次4854 - 4856
國際標準期刊號0018-9464
電子國際標準期刊號1941-0069
語言英式英語
Web of Science 學科類別Engineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Physics; Physics, Applied; PHYSICS, APPLIED

上次更新時間 2021-25-02 於 02:21