Depinning of the transverse domain wall trapped at magnetic impurities patterned in planar nanowires: Control of the wall motion using low-intensity and short-duration current pulses
Autor: | P. Z. Coura, D. Toscano, Maxwel Gama Monteiro, S. A. Leonel, Fernando Sato, E. L. M. Paixão, J. C. S. Gomes |
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Rok vydání: | 2018 |
Předmět: |
Materials science
Spintronics Condensed matter physics Nanowire Spin-transfer torque 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Transverse plane Planar Domain wall (magnetism) Impurity Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics 0210 nano-technology Magnetic impurity |
Zdroj: | Journal of Magnetism and Magnetic Materials. 451:639-646 |
ISSN: | 0304-8853 |
Popis: | Understanding and controlling of domain wall motion in magnetic nanowires is extremely important for the development and production of many spintronic devices. It is well known that notches are able to pin domain walls, but their pinning potential strength are too strong and it demands high-intensity current pulses to achieve wall depinning in magnetic nanowires. However, traps of pinning can be also originated from magnetic impurities, consisting of located variations of the nanowire’s magnetic properties, such as exchange stiffness constant, saturation magnetization, anisotropy constant, damping parameter, and so on. In this work, we have performed micromagnetic simulations to investigate the depinning mechanism of a transverse domain wall (TDW) trapped at an artificial magnetic defect using spin-polarized current pulses. In order to create pinning traps, a simplified magnetic impurity model, only based on a local reduction of the exchange stiffness constant, have been considered. In order to provide a background for experimental studies, we have varied the parameter related to the pinning potential strength of the magnetic impurity. By adjusting the pinning potential of magnetic impurities and choosing simultaneously a suitable current pulse, we have found that it is possible to obtain domain wall depinning by applying low-intensity and short-duration current pulses. Furthermore, it was considered a planar magnetic nanowire containing a linear distribution of equally-spaced magnetic impurities and we have demonstrated the position control of a single TDW by applying sequential current pulses; that means the wall movement from an impurity to another. |
Databáze: | OpenAIRE |
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