DocumentCode :
1321141
Title :
Study of Vortex Configuration and Switching Behavior in Submicro-Scaled Asymmetric Permalloy Ring
Author :
Huang, Chao Hsien ; Cheng, Nian Jia ; Wu, Feng Sheng ; Wu, Jong Ching ; Horng, Lance
Author_Institution :
Dept. of Phys., Nat. Changhua Univ. of Educ., Changhua, Taiwan
Volume :
48
Issue :
11
fYear :
2012
Firstpage :
3648
Lastpage :
3650
Abstract :
The influence of the degree of asymmetry of a Permalloy ring on the switching behavior and vortex configuration was studied by changing the diameter of the circle and its shift length. The object oriented micromagnetic framework software was used to simulate the magnetic configurations and reversal processes in a single asymmetric Permalloy ring. By introducing an inner circle shifted from the center of the outer circle by a shift length, an asymmetric ring and asymmetric ratio are defined. The vortex nucleation (Hn) and vortex annihilation (Han) fields, analyzed from the simulated hysteresis loops with 300, 500, and 800 nm outer diameters, have linear relations to the asymmetric ratio. It is noteworthy that a linear relationship for Hn is independent on the variation of the inner diameters and is only dependent on the asymmetric ratio. This result demonstrates that an asymmetric ring could determine not only the vortex chirality, but also the vortex nucleation and annihilation fields.
Keywords :
Permalloy; ferromagnetic materials; magnetic hysteresis; magnetic switching; magnetisation reversal; micromagnetics; nucleation; vortices; FeNi; asymmetric ratio; asymmetry degree; circle diameter; inner circle; inner diameter variation; magnetic configurations; object oriented micromagnetic framework software; outer circle center; outer diameters; reversal processes; shift length; simulated hysteresis loops; single asymmetric Permalloy ring; size 300 nm; size 500 nm; size 800 nm; submicroscaled asymmetric Permalloy ring; switching behavior; vortex annihilation field; vortex chirality; vortex configuration; vortex nucleation field; Magnetic cores; Magnetic domain walls; Magnetic domains; Magnetic hysteresis; Magnetic switching; Saturation magnetization; Switches; Asymmetric ring; ferromagnetic materials; magnetic hysteresis; magnetic switching;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2012.2204044
Filename :
6332748
Link To Document :
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