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How many bits in a single magnetic dot? | | Fabien Cheynis
; Olivier Fruchart
; Jean-Christophe Toussaint
; Nicolas Rougemaille
; Rachid Belkhou
; | | Date: |
22 Dec 2007 | | Abstract: | Digital information processing relies on the handling of two states, called
bits or ’0’ and ’1’. In magnetoelectronic devices bits are stored using the two
possible directions of magnetization in nanoscale bistable domains. In
hard-disk drives these are written in continuous thin films, while in Magnetic
Random Access Memories (MRAMs) or for other concepts of magneto-logic devices
bits rely on single-domain flat elements patterned with lithography. While
miniaturisation is the conventional way to fuel the continuous increase of
device density, disruptive solution are also sought. For patterned elements,
e.g. disk-shaped, it has been proposed that bits could be stored in dots
displaying a flux-closure magnetic state, coded in the chirality of the
structure or in the up-or-down magnetic vortex at the center of the dot. In
this Letter we go one step further, and show numerically and experimentally
that a third bit, i.e. implying in principle eight independent micromagnetic
states, could be stored in a simple magnetic dot. This is achieved by
considering an elongated dot, in which case the vortex is replaced by a more
complex domain wall displaying two internal degrees of freedom. | | Source: | arXiv, 0712.3834 | | Services: | Forum | Review | PDF | Favorites | |
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