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Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts
- Source :
- Physical Review B. 100
- Publication Year :
- 2019
- Publisher :
- American Physical Society (APS), 2019.
-
Abstract
- To enable functional skyrmion based spintronic devices, the controllable generation and manipulation of skyrmions is essential. While the generation of skyrmions by using a magnetic geometrical constriction has already been demonstrated, this approach is difficult to combine with a subsequent controlled manipulation of skyrmions. The high efficiency of skyrmion generation from magnetic constrictions limits the useful current density, resulting in stochastic skyrmion motion, which may obscure topological phenomena such as the skyrmion Hall effect. In order to address this issue, we designed a nonmagnetic conducting Ti/Au point contact in devices made of Ta/CoFeB/TaOx trilayer films. By applying high voltage pulses, we experimentally demonstrated that skyrmions can be dynamically generated. Moreover, the accompanied spin topology dependent skyrmion dynamics, the skyrmion Hall effect is also experimentally observed in the same devices. The creation process has been numerically reproduced through micromagnetic simulations in which the important role of skyrmion-antiskyrmion pair generation is identified. The motion and Hall effect of the skyrmions, immediately after their creation is described using a modified Thiele equation after taking into account the contribution from spatially inhomogeneous spin-orbit torques and the Magnus force. The simultaneous generation and manipulation of skyrmions using a nonmagnetic point contact could provide a useful pathway for designing novel skyrmion based devices.<br />All comments are welcome
- Subjects :
- Condensed Matter::Quantum Gases
Physics
Work (thermodynamics)
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Skyrmion
High Energy Physics::Phenomenology
FOS: Physical sciences
02 engineering and technology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
01 natural sciences
Point contact
Pair formation
Hall effect
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
Point (geometry)
Magnus effect
010306 general physics
0210 nano-technology
Nonlinear Sciences::Pattern Formation and Solitons
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 100
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....d9207b6ed1822db334ebac9ad57d0b28