SINGLE MAGN DYNAMICS · Highly time-resolved single event capture of field- and current-induced magnetization dynamics in thin metallic films and nanostructures
6РП — Действия „Мария Кюри“
- Период
- 2006-01-01 → 2007-12-31
- Финансиране от ЕС
- 157 064 €
- Участници
- 1
- Схема
- —
Линиите свързват координатора с партньорите.
Накратко на български
Движението на магнитните стени в метални наножици се проследява чрез специален микроскоп, например при добавяне на холмий към никел-железен сплав. Това помага за разбирането на взаимодействието между електрическия ток и магнетизацията, което позволява проверка на съществуващите научни теории.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - SINGLE MAGN DYNAMICS (Highly time-resolved single event capture of field- and current-induced magnetisation dynamics in thin metallic films and nanostructures)
The objectives of this project were to build a microscope for capturing the motion of domain walls in magnetic nanowires in a single exposure ("single shot measurement"), and use it to study magnetic field- and electric current-induced domain wall motion in the wires. Achievements in the area of the experimental set-up included optics for focusing the microscope laser beam to a diameter of one micrometre, a precise sample scanning system for positioning the laser beam on a magnetic nanowire, and a custom built high frequency electromagnet to function together with the above. Techniques were developed to measure the laser beam diameter, automatically position domain walls in the magnetic nanowire, and importantly, to record the trace of the domain wall motion in a single shot. Scientific achievements included the measurement of magnetic field-induced domain wall velocities in nickel-iron alloy (Permalloy) nanowires and in Permalloy wires containing small amounts of holmium. The holmium was shown to decrease the domain wall velocity, and simulations indicated that this is accompanied by changes in the domain wall structure during the propagation. Since the measurements were single shot, a study was also permitted of the characteristic random behaviour of the domain wall motion due to temperature effects and natural inhomogeneities in the sample. Current-induced domain wall velocities in the Permalloy wires did not change with increasing holmium content, in contrast to domain walls propagated by field. This is the most important scientific achievement of the project; it allows a test of theories of current-induced magnetisation switching and it contributes to the understanding of the interaction between electric current and magnetic domain walls.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
This project will study single magnetization reversal events in magnetic thin films and nanostructures using a magneto-optic Kerr effect magnetometer with sub-nanosecond time resolution. The magnetization switching will be induced using both externally ap plied magnetic fields (pulses and oscillating fields) and electrical currents. The main aims of the project are to bridge the gap in understanding of the dynamic magnetization reversal process in the frequency range 1 MHz 1 GHz in thin magnetic films, an d to understand the stochastic nature of single domain wall dynamics in magnetic nanostructures. A further important aim is to compare the effects of applied field- and electrical current pulses on the domain wall dynamics. This will provide a crucial te st of present theories of current-induced switching as well as deeper insight into the underlying mechanisms. The project will allow the applicant to extend his expertise in the field of magnetization reversal dynamics, as well as diversify into the resea rch of magnetic nanostructures and the technologically important area of current-induced switching. The project is expected to lead to world-class research and increased co-operation between academia and industry, as well as bring enhanced scientific and professional skills that will benefit the career of the applicant.
Оригинален текст от CORDIS (на английски).
Участници
- UNIVERSITAET KONSTANZ · KONSTANZКоординаторГермания
Връзки
Данни: CORDIS, © Европейски съюз