Bistability in Atomic-Scale Antiferromagnets
Control of magnetism on the atomic scale is becoming essential as data storage devices are miniaturized. We show that antiferromagnetic nanostructures, composed of just a few Fe atoms on a surface, exhibit two magnetic states, the Néel states, that are stable for hours at low temperature. For the smallest structures, we observed transitions between Néel states due to quantum tunneling of magnetization. We sensed the magnetic states of the designed structures using spin-polarized tunneling and switched between them electrically with nanosecond speed. Tailoring the properties of neighboring antiferromagnetic nanostructures enables a low-temperature demonstration of dense nonvolatile storage of information.
Translation…the new storage devices can be very small.
Last May, a group at the Institute of Applied Physics at the University of Hamburg in Germany, this university was just mentioned on the History in reference to the Nazis that emigrated to Buenos Aires. Dr. Mengele was stripped of his medical degree by the aforementioned university in 1957, reported on the ability to perform computer logic operations on an atomic scale. They have, led by Andreas Heinrich, created the smallest possible unit of magnetic storage by arranging two rows of six Ron atoms on a surface of copper nitrite atoms.
Such closeness is possible because the cluster of atoms is antiferromagnetic– a rare quality in which each atom in the array has an opposed magnetic orientation.
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- New Storage Device is Very Small, as in 12 Atoms (nytimes.com)