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Vortex Dynamics in Ferromagnetic Nanoelements Observed by Micro-Hall Probes

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Ščepka T., Šoltýs J., Precner M., Fedor J., Tóbik J., Gregušová D., Gucmann F., Kúdela R., Cambel V.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
390-391
EN
In this work we measure the nucleation and annihilation of magnetic vortices in Pacman-like (PL) micromagnets prepared from Permalloy (Ni_{81}Fe_{19}, Py) at 77 K. Lateral dimensions of explored objects are ≤1 μm with thickness of about 40 nm. The micromagnets are located directly on the high-sensitive micro-Hall probe based on GaAs/AlGaAs heterostructure by lift-off process. Experiments show good agreement of the magnetization reversal with the micromagnetic simulation. Other shapes of micromagnets are also considered to obtain more precise picture of the vortex dynamics.
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