Spontaneous Domain Wall Motion at Zero External Magnetic Field in Ferromagnetic Nanowire

Author

Djuhana, Dede ; Piao, Hong-Guang ; Shim, Je-Ho ; Lee, Sang-Hyuk ; Jun, Su-Hyeong ; Yu, Seong-Cho ; Oh, Suhk Kun ; Kim, Dong-Hyun

Author_Institution

Dept. of Phys., Chungbuk Nat. Univ., Cheongju, South Korea

Volume

46

Issue

2

fYear

2010

Firstpage

217

Lastpage

219

Abstract

We have explored a spontaneous domain wall motion in ferromagnetic nanowire at zero external magnetic field by means of micromagnetic simulation. Very interestingly, even with no external magnetic field, a spontaneous domain wall motion is observed with a speed about few tens of m/s, which is significant and not negligible in analysis of the domain wall dynamics on nanowires. The spontaneous zero-field wall motion is explained based on the minimization condition of the magnetostatic energy, preferring to have a wire magnetically saturated. Average speed of the spontaneous wall motion is found to increase as the wire thickness increases.

Keywords

Permalloy; exchange interactions (electron); ferromagnetic materials; magnetic anisotropy; magnetic domain walls; magnetostatics; micromagnetics; nanowires; NiFe; exchange stiffness coefficient; ferromagnetic nanowire; magnetic saturation; magnetocrystalline anisotropy; magnetostatic energy; micromagnetic simulation; saturation magnetization; spontaneous domain wall motion; zero external magnetic field; Magnetic analysis; Magnetic domain walls; Magnetic domains; Magnetic field measurement; Magnetic fields; Magnetostatics; Micromagnetics; Motion analysis; Saturation magnetization; Wire; Ferromagnetic wire; magnetostatic energy; micromagnetic simulation; spontaneous domain wall motion;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2032139

Filename

5393126