Trajectory and chirality of vortex domain walls in ferromagnetic nanowires with an asymmetric Y-branch
| Autor: | J. Brandão, Alexandre Mello, L. C. Sampaio, Flávio Garcia |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Kerr effect Condensed matter physics Nanowire General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Vortex Magnetic field Hysteresis Magnetization Domain wall (magnetism) 0103 physical sciences Domain (ring theory) 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Applied Physics. 121:093905 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | The motion and trajectory of vortex domain walls (VDWs) driven by magnetic field were investigated in Fe80Ni20 nanowires with an asymmetric Y-shape branch. By using the focused magneto-optical Kerr effect, we have probed the injection, pinning, and propagation of VDWs in the branch and in the wire beyond the branch entrance. Hysteresis cycles measured at these points show 3 and 4 jumps in the magnetization reversal, respectively. Micromagnetic simulations were carried out to obtain the number of jumps in the hysteresis cycles, and the magnetization process involved in each jump. Based on simulations and from the size of the jumps in the measured hysteresis cycles, one obtains the histogram of the domain wall type probability. While in the branch domain walls of different types are equiprobable, in the nanowire vortex domain walls with counter clockwise and clockwise chiralities and transverse-down domain walls are measured with probabilities of 65%, 25%, and 10%, respectively. These results provide an add... |
| Databáze: | OpenAIRE |
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