Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Micromagnetism / Computational Magnetics
MA 20.4: Vortrag
Mittwoch, 24. März 2010, 17:45–18:00, H22
Effect of the Anisotropy Distribution on the Coercive Field and Switching Field Distribution of Bit Patterned Media — •Philipp Krone1, Denys Makarov1, Thomas Schrefl2, and Manfred Albrecht1 — 1Chemnitz University of Technology, Institute of Physics, D-09107 Chemnitz, Germany — 2St. Pölten University of Applied Sciences, A-3100 St. Pölten, Austria
Bit patterned media (BPM) is a promising concept for future magnetic storage devices providing ultra-high recording densities beyond 1 Tbit/inch2. The concept of BPM implies the formation of an ordered two dimensional array of magnetic nanostructures with an out-of-plane magnetic anisotropy, where an individual nanostructure will store a single bit of information. A systematic study on the magnetization reversal in square arrays of magnetic nanostructures will be presented. To account for the unavoidable inhomogeneities of the magnetic properties, a distribution of magnetic anisotropy values was taken into account. We show that the variation in magnetic anisotropy and the influence of magnetic dipole-dipole interaction between the individual bits with separation distance is crucial for the performance of bit patterned media concerning in particular the switching field distribution [1]. Interestingly, a narrowing of the switching field distribution was found with the angle between the direction of the external magnetic field and easy axis of magnetization, which is an important aspect for the usability of bit patterned media with tilted anisotropy at ultra-high storage densities beyond 1 Tbit/inch2.
[1] Krone et al., J. Appl. Phys. 106 (10), 103913 (2009)