title: Tunable inertia of chiral magnetic domain walls.
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.
authors.affiliation: National Institute for Materials Science, Tsukuba 305-0047, Japan.|Unité Mixte de Physique CNRS/Thales, 1 Avenue Augustin Fresnel, 91767 Palaiseau, France.
authors.forename: Jacob
authors.initials: J
authors.lastname: Torrejon
authors.affiliation: Departamento de Fisica Aplicada, University of Salamanaca, Plaza de los Caidos s/n, E-37008 Salamanca, Spain.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Martinez
authors.affiliation: National Institute for Materials Science, Tsukuba 305-0047, Japan.|Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Hayashi