Study of the Formation and Switching Behavior of 360 ﾟ Domain Walls in Permalloy Thin Film Rings

• Main Author: 詹禮豪
• Other Authors: 洪連輝
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/51590297490001723249

碩士 === 國立彰化師範大學 === 物理學系 === 103 === We investigated the formation of 360ﾟ domain walls (360DW) in a permalloy ring. We observed the magnetic reversal behaviors of moments by simulation software OOMMF program to analyze, with different inner diameter, outer diameter and thickness. In this study, we found that the 360 degree domain wall cannot be generated when the thickness is above 10 nm. On the other hand, the energy of 360DW is lower then onion state and become metastable. The vortex state have lowest energy, it is a stable state. If a reverse field was applied, the 360DW would be separated into two 180DWs. We noted that the above-mentioned process was reproducible.