National Changhua University of Education Institutional Repository : Item 987654321/18495
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題名: Geometric Shape Dependence of Coercivity for Patterned Magnetic Thin Film
作者: Wu, Te-Ho;Wu, Jong-Ching;Wu, C. S.;Chen, Bing-Mau;Shieh, Han-Ping D.
貢獻者: 物理學系
關鍵詞: Coercivity;E-beam lithography;Micro-structure;Shaped-dependence;Canting
日期: 2000-02
上傳時間: 2014-06-06T07:17:49Z
出版者: Elsevier
摘要: The micro-strips with patterned magnetic domains using electron beam lithography have been made to study the geometric shape dependence of coercivity. The size of the micro-strip is 10 μm×30 μm with 0.5 μm periods hole arrays pattern. Arrays with different types of geometry, such as square-, circle-, and ellipse-shapes have been made. Amorphous rear-earth transition-metal (RE-TM) thin films with magnetic perpendicular anisotropy were deposited on the micro-strips. The extraordinary Hall effect has been employed to measure the hysteresis loop and the coercivity of the sample. We have found that for the same deposited material, the magnitude of coercivity for various shapes are dissimilar. For example, the coercivity of the ellipse-shaped hole arrays is much larger than the coercivity of the square-shaped hole arrays. In addition, we observed that the coercivity of the patterned sites was larger than the sites without patterns for RE-dominated compounds and the coercivity of the patterned sites was smaller than the sites without patterns for TM-dominated compounds. The magnetic moments canting between RE and TM subnetworks will be used to explain the observed phenomena.
關聯: Journal of Magnetism and Magnetic Materials, 209(1-3): 220-223
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