What is it about?
Clockwise and anticlockwise magnetic states can be used as logic and memory elements. In this article, we describe how to use current pulses to switch between these states.
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Why is it important?
These elements can be used in active logic devices as well as memory, hence "smart memory", which can help alleviate communication bottlenecks between computer processors and their bulk memory. They are more robust against electromagnetic interference than purely electrical devices.
Read the Original
This page is a summary of: Fast current-driven switching of magnetic vortex states in permalloy microrings, Applied Physics Letters, April 2013, American Institute of Physics,
DOI: 10.1063/1.4799657.
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Resources
Logic operations and data storage using vortex magnetization states in mesoscopic permalloy rings, and optical readout
Abstract: Optical coatings applied to one-half of thin film magnetic rings allow real-time readout of the chirality of the vortex state of micro- and nanomagnetic structures by breaking the symmetry of the optical signal. We use this technique to demonstrate data storage, operation of a NOT gate that uses exchange interactions between slightly overlapping rings, and to investigate the use of chains of rings as connecting wires for linking gates.
Optical Characterization of All-Magnetic NOT Gate Operation in Vortex Rings
We have demonstrated deterministic operation of inverters (NOT gates) using vortex magnetization states in pairs of linked 5 m diameter permalloy rings with a small region of overlap. The input ring is clipped so that the state can be controlled by global fields, and is designed to switch at lower fields than the unclipped output ring, which then inverts the logical state of the input.
Longitudinal magneto-optic Kerr effect detection of latching vortex magnetization chirality in individual mesoscale rings
We report on a method for breaking the symmetry of the optical signal arising from vortex magnetization in individual micron scale rings. A dielectric coating enhances the longitudinal magneto-optical Kerr effect signal from one half of the ring, while leaving the magnetic interactions unperturbed. The chirality of a single ring can be determined using this method, even with a beam waist much larger than the ring diameter.
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