Tunable inertia of chiral magnetic domain walls

Jacob Torrejon, Eduardo Martinez and Masamitsu Hayashi ()
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Jacob Torrejon: National Institute for Materials Science
Eduardo Martinez: University of Salamanaca
Masamitsu Hayashi: National Institute for Materials Science

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract The time it takes to accelerate an object from zero to a given velocity depends on the applied force and the environment. If the force ceases, it takes exactly the same time to completely decelerate. A magnetic domain wall is a topological object that has been observed to follow this behaviour. Here we show that acceleration and deceleration times of chiral Neel walls driven by current are different in a system with low damping and moderate Dzyaloshinskii–Moriya exchange constant. The time needed to accelerate a domain wall with current via the spin Hall torque is much faster than the time it needs to decelerate once the current is turned off. The deceleration time is defined by the Dzyaloshinskii–Moriya exchange constant whereas the acceleration time depends on the spin Hall torque, enabling tunable inertia of chiral domain walls. Such unique feature of chiral domain walls can be utilized to move and position domain walls with lower current, key to the development of storage class memory devices.

Date: 2016
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DOI: 10.1038/ncomms13533

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