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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Domain wall structure transition during magnetization reversal process in magnetic nanowires
HAN Nian-mei(韩念梅), GUO Guang-hua(郭光华), ZHANG Guang-fu(张光富), SONG Wen-bing(宋文斌), MEN Gao-fu(门高夫)

School of Physics Science and Technology, Central South University, Changsha 410083, China

Abstract:The analytical micromagnetics and numerical simulations were used to investigate the domain wall structure during the magnetization reversal in nanowires. Micromagnetic analysis shows that the domain wall structure is mainly determined by the competition between the demagnetization energy and exchange energy. The wall with vortex magnetization structure in cross-section is energetically more favorable for wires with large diameter. With the reduction of diameter the exchange energy increases. At a critical diameter the vortex structure can not be sustained and the transition from vortex wall to transverse wall occurs. The critical diameters for this transition are about 40 nm for Ni wire and 20 nm for Fe wire, respectively. A series of micromagnetic simulations on the cone-shaped wire confirm the analytical results. The simulations also show that during the reversal process the vortex domain wall moves much faster than the transverse one.

 

Key words: magnetic nanowire; magnetization reversal; domain wall structure; micromagnetics

ISSN 1672-7029
CN 43-1423/U

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