Giant Skyrmions Stabilized by Dipole-Dipole Interactions in Thin Ferromagnetic Films

被引:115
作者
Ezawa, Motohiko [1 ]
机构
[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
关键词
DOMAIN-STRUCTURES;
D O I
10.1103/PhysRevLett.105.197202
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Motivated by a recent magnetization reversal experiment on a TbFeCo thin film, we study a topological excitation in the anisotropic nonlinear sigma model together with the Zeeman and magnetic dipole-dipole interactions. Dipole-dipole interactions turn a ferromagnet into a frustrated spin system, which allows a nontrivial spin texture such as a giant Skyrmion. We derive an analytic formula for the Skyrmion radius. The radius is controllable by the external magnetic field. It is intriguing that a Skyrmion may have already been observed as a magnetic domain. A salient feature is that a single Skyrmion can be created or destroyed experimentally. An analysis is made also on Skyrmions in chiral magnets.
引用
收藏
页数:4
相关论文
共 17 条
[1]   Critical comparison of classical field theory and microscopic wave functions for skyrmions in quantum Hall ferromagnets [J].
Abolfath, M ;
Palacios, JJ ;
Fertig, HA ;
Girvin, SM ;
MacDonald, AH .
PHYSICAL REVIEW B, 1997, 56 (11) :6795-6804
[2]  
[Anonymous], 2010, MULTIFACED SKYRMIONS
[3]   Colloquium:: Opportunities in nanomagnetism [J].
Bader, SD .
REVIEWS OF MODERN PHYSICS, 2006, 78 (01) :1-15
[4]   Skyrmion lattice in a two-dimensional chiral magnet [J].
Han, Jung Hoon ;
Zang, Jiadong ;
Yang, Zhihua ;
Park, Jin-Hong ;
Nagaosa, Naoto .
PHYSICAL REVIEW B, 2010, 82 (09)
[5]   STRIPE DOMAIN-STRUCTURES IN A THIN FERROMAGNETIC FILM [J].
KASHUBA, AB ;
POKROVSKY, VL .
PHYSICAL REVIEW B, 1993, 48 (14) :10335-10344
[6]   Skyrmion Lattice in a Chiral Magnet [J].
Muehlbauer, S. ;
Binz, B. ;
Jonietz, F. ;
Pfleiderer, C. ;
Rosch, A. ;
Neubauer, A. ;
Georgii, R. ;
Boeni, P. .
SCIENCE, 2009, 323 (5916) :915-919
[7]   Skyrmion lattice in the doped semiconductor Fe1-xCoxSi [J].
Muenzer, W. ;
Neubauer, A. ;
Adams, T. ;
Muehlbauer, S. ;
Franz, C. ;
Jonietz, F. ;
Georgii, R. ;
Boeni, P. ;
Pedersen, B. ;
Schmidt, M. ;
Rosch, A. ;
Pfleiderer, C. .
PHYSICAL REVIEW B, 2010, 81 (04)
[8]   STABILITY OF PERIODIC DOMAIN-STRUCTURES IN A 2-DIMENSIONAL DIPOLAR MODEL [J].
NG, KO ;
VANDERBILT, D .
PHYSICAL REVIEW B, 1995, 52 (03) :2177-2183
[9]   Submicron-scale spatial feature of ultrafast photoinduced magnetization reversal in TbFeCo thin film [J].
Ogasawara, T. ;
Iwata, N. ;
Murakami, Y. ;
Okamoto, H. ;
Tokura, Y. .
APPLIED PHYSICS LETTERS, 2009, 94 (16)
[10]   CONDENSED-MATTER PHYSICS Single skyrmions spotted [J].
Pfleiderer, Christian ;
Rosch, Achim .
NATURE, 2010, 465 (7300) :880-881