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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/18845

Title: 新穎磁性多層膜與奈米結構之磁電效應研究-新穎磁性多層膜奈米磁區結構之製作分析與鑄型應用元件製作(III)
Nanofabrication and Applications of Domain Structures and Devices in Novel Magnetic Multilayers(III)
Authors: 吳仲卿
Contributors: 物理學系
Keywords: 微磁學;磁力顯微儀;鎳鐵環;磁性多層膜穿遂結;磁矩動態翻轉
Micro-magnetism;Permalloy ring;Magnetic tunnel junction;Magnetization reversal
Date: 2005
Issue Date: 2014-08-06T05:03:49Z
Abstract: 本年為三年期整合型計畫的最後一年,在過去三年研究期間,我們持續探討微磁學相關的部分,除了靜態磁區的形成與分佈,同時透過磁阻的量測,進一步的探討了主要內容涵蓋如下:透過磁力顯微儀探究奈米級磁性薄膜之磁區結構;經由磁阻量測微米級鎳鐵環的磁區動態行為;磁性多層膜之穿遂磁阻行為。尤其結合多年來對鎳鐵單層環的磁區結構瞭解,我們成功的解釋發生於磁性多層膜穿遂結相關現象。
During the last three years of joint project, the micro-magnetism-related subjects have been continually studied in this sub-areas of as follow: magnetization configuration and it’s evolution under external magnetic field on micro-structured permalloy ring devices; dynamic behaviors were investigated through magnetoresistance measurements; studies on the microstructured tunnel junctions in the multilayer magnetic films, especially with the ring-shaped devices. With the knowledge accumulated in the past we have successfully interpreted the reversal behavior in the magnetic tunnel junction rings.
In the first subject, we have thoroughly studied the formation of vortex, onion, and metastable states in the permalloy ring devices. Furthermore, the dynamic behavior of magnetization subjected to external magnetic field has also been investigated through magnetic force microscopy and magnetoresistacne measurements. The size dependent of the domain configurations as well as the transition fields of vortex-to-onion and onion-to-vortex have been worked out in terms of the ring diameter, linewidth, and the thickness. Best of all, we have also studied the ring magnetization reversal by using current-induced magnetic field, i.e. with a current running through the ring center, which may offer an alternative and as best way of read/write technique in the field of magneto-resistive random access memory.
We have, for the first time in the world, reported the ring-shaped magnetic tunnel junction. The main subject is to work out the reversal behaviors that may give us a better idea of further applications out of this subject. Indeed, the multiple meta-stable states occurred in the reversal regions have shown promising potential for ultrahigh density of magnetic storage.
Relation: 國科會計畫, 計畫編號: NSC94-2112-M018-002; 研究期間: 9408-9507
Appears in Collections:[物理學系] 國科會計畫

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