Fast domain wall dynamics in magnetic nanotubes: Suppression of Walker breakdown and Cherenkov-like spin wave emission
TL;DR: In this article, a micromagnetic study on domain wall (DW) propagation in ferromagnetic nanotubes was conducted and it was found that DWs in a tubular geometry are much more robust than ones in flat strips.
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Abstract: We report on a micromagnetic study on domain wall (DW) propagation in ferromagnetic nanotubes. It is found that DWs in a tubular geometry are much more robust than ones in flat strips. This is explained by topological considerations. Our simulations show that the Walker breakdown of the DW can be completely suppressed. Constant DW velocities above 1000 m/s are achieved by small fields. A different velocity barrier of the DW propagation is encountered, which significantly reduces the DW mobility. This effect occurs as the DW reaches the phase velocity of spin waves (SWs), thereby triggering a Cherenkov-like emission of SWs.
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Citations
Fast vortex wall motion in wide permalloy strips from double switching of the vortex core
Virginia Estévez,Lasse Laurson +1 more
TL;DR: Estevez et al. as discussed by the authors studied vortex domain wall dynamics in wide Permalloy strips driven by applied magnetic fields and spin-polarized electric currents, and showed that the high velocity plateau originates from a repeated double switching of the magnetic vortex core, underlying the periodic vortex core dynamics in the vicinity of the strip edge.
Spin-Cherenkov effect in a magnetic nanostrip with interfacial Dzyaloshinskii-Moriya interaction
TL;DR: In this paper, the effect of the interfacial DMI on spin wave excitations in permalloy thin-film strips within the framework of micromagnetism was studied.
Magnetic power inverter: AC voltage generation from DC magnetic fields
Jun'ichi Ieda,Sadamichi Maekawa +1 more
TL;DR: In this paper, the authors proposed a method that allows power conversion from DC magnetic fields to AC electric voltages using domain wall motion in ferromagnetic nanowires, which relies on spinmotive force, voltage generation due to magnetization dynamics.
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Hybrid torque and SQUID magnetometry of individual magnetic nanotubes
A. Buchter
- 01 Jan 2015
TL;DR: In this paper, a hybrid magnetometer consisting of a ultra sensitive Si cantilever and a nano-scale superconducting quantum interference device (nanoSQUID) is developed.
7
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