Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-06-18
Phys. Rev. B 76, 184408 (2007)
Physics
Condensed Matter
Other Condensed Matter
25 pages, 4 figures
Scientific paper
10.1103/PhysRevB.76.184408
The magnetic field (or electric current) driven domain-wall motion in magnetic nanostripes is of considerable interest because it is essential to the performance of information storage and logic devices. One of the currently key problems is to unveil the complex behaviors of oscillatory domain-wall motions under applied magnetic fields stronger than the so-called Walker field, beyond which the velocity of domain walls markedly drops. Here, we provide not only considerably better understandings but also new details of the complex domain-wall motions. In a certain range just above the Walker field, the motions are not chaotic but rather periodic with different unique periodicities of dynamic transformations of a moving domain wall between the different types of its internal structure. Three unique periodicities found, which consist of different types of domain wall that are transformed from type one to another. The transformation periods vary with the field strength and the nanostripe width. This novel phenomenon can be described by the dynamic motion of a limited number of magnetic topological solitons such as vortex and antivortex in nanostripes.
Choi Sangkook
Guslienko Konstantin Y.
Kim Sang-Koog
Lee Jun-Young
Lee Ki-Suk
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