Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 46: Nanomaterials I
MM 46.5: Vortrag
Donnerstag, 29. März 2012, 11:15–11:30, H 1029
Tailoring magnetization reversal in magnetic nano-dots with 3D shape modifications — •Tomasz Blachowicz1 and Andrea Ehrmann2 — 1Institute of Physics, Silesian University of Technology, Gliwice, Poland — 2Hochschule Niederrhein, Faculty of Textile and Clothing Technology, Mönchengladbach, Germany
Understanding reversal mechanisms and dynamics of magnetic nanosystems is one of the leading topics in contemporary physics. In our study, the magnetization reversal dynamics and hysteresis loops of three-dimensional ferromagnetic permalloy half-balls have been examined using micromagnetic simulations and finite element methods [1].
Comparison of samples with different 3D shape modifications enables observations of the nature of switching, oscillation types and frequencies as well as times of reversal, triggered by an external magnetic field. It has been found that a moderate imperfection can enhance the switching process and strongly suppress magnetization oscillations.
Since magnetization characteristics can be modified by changes in the geometry of the magnetic nano-particles, an exact design of the nano-dots allows for tailoring the desired properties for new applications in magneto-electronics, like magnetic field sensors or data storage devices.
[1] T. Blachowicz, A. Ehrmann, P. Steblinski, and L. Pawela: Magnetization reversal in magnetic half-balls influenced by shape perturbations, J. Appl. Phys. 108, 123906 (2010)