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Ferromagnetic resonance of transverse domain wall in cylindrical nanowire induced by spin-transfer torque
YIN Yaoyao,LI Zhixiong,WANG Xiguang,NIE Yaozhuang,GUO Guanghua *
School of Physics and Electronics, Central South University, Changsha, 410083
*Correspondence author
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Funding: Doctoral Fund of Ministry of Education of China (No.20120162110020), National Natural Science Foundation of China(No.11374373), Natural Science Foundation of Hunan Province of China(No.13JJ2004)
Opened online:27 April 2015
Accepted by: none
Citation: YIN Yaoyao,LI Zhixiong,WANG Xiguang.Ferromagnetic resonance of transverse domain wall in cylindrical nanowire induced by spin-transfer torque[OL]. [27 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4639454
The excitation of normal oscillation modes of a transverse domain wall in cylindrical nanowire induced by alternating spin-polarized current is studied by using micromagnetic simulations. Several localized normal modes are identified and their features are characterized by mapping the spatial distributions of oscillation. When current flows perpendicular to the wall, the excited modes are localized volume modes, surface modes and surface standing-wave modes. For volume modes, the oscillations are mainly distributed at the wall boundary and wall central areas. The oscillations of the surface and surface standing-wave modes are concentrated at the cylindrical surface. The localization and spatial distribution of the normal modes have a close relationship with the total internal field, especially its inhomogeneity. In the case that the current is parallel to the wall, the wall thickness oscillation mode (or breathing mode) is excited. A new kind of thickness modes, surface thickness oscillation mode, is also observed. Besides, the surface mode and surface standing-wave modes are formed around the circle surface at the center of the domain wall.
Keywords:magnetism; magnetic domain wall; ferromagnetic resonance; spin wave; spin-transfer torque; micromagnetic simulation

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