Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.10: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Investigation of stable intermediate states in fourfold nano-systems — •Andrea Ehrmann1 and Tomasz Blachowicz2 — 1Hochschule Niederrhein, Faculty of Textile and Clothing Technology, Mönchengladbach, Germany — 2Institute of Physics, Silesian University of Technology, Gliwice, Poland
In systems of four crossed ferromagnetic nano-wires, pronounced magnetization steps in the hysteresis loops have been found using micromagnetic simulations [1]. The steps can be attributed to stable intermediate states, similar to flux-closed vortex states in ferromagnetic nano-rings.
Due to the fourfold anisotropy of the system of four coupled nano-wires, these states can be distinguished even by measuring the magnetization of the whole system, giving rise to four separated states in the absence of an external magnetic field. Opposite to actual trials with nano-rings or layered structures, no additional method of symmetry breaking is necessary. Downscaling the system leads to qualitative changes in the magnetization reversal, which have to be taken into account by changing the material or adjusting the design.
Such a system can be utilized, e.g., in quaternary (four states, i.e. two bits per magnetic nano-object) magnetic storage applications.
[1] T. Blachowicz, A. Ehrmann: Fourfold nanosystems for quaternary storage devices, J. Appl. Phys. 110, 073911 (2011)