Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based
racetrack memory
Xichao Zhang1, G. P. Zhao1, 2, *, Hans Fangohr3, J. Ping Liu2, 4, W. X. Xia2, J. Xia1, F. J. Morvan1
1
College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China
2
Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology & Engineering,
Chinese Academy of Sciences, Ningbo 315201, China
3
Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom
4
Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, USA
SUPPLEMENTARY INFORMATION
Supplementary Movie 1. Vertical-current-driven motion of skyrmionic bit on the
40-nm-wide normal racetrack within 10 ns. The current density j = 5 × 1010 A/m2 and
DMI constant D = 3 × 10-3 J/m2. The direction of the electron polarization (P = 0.4) is
in-plane and makes a 60 degrees angle with the length-axis of the racetrack, which
ensures that the skyrmion is driven by the current moving along the racetrack towards
right but without touching the upper track border. The component of magnetization
perpendicular to the viewing plane is color coded (teal blue is into the plane, red is out of
the plane, white is in-plane).
Supplementary Movie 2. Vertical-current-driven motion of skyrmionic bit on the
40-nm-wide normal racetrack within 10 ns. The current density j = 5 × 1010 A/m2 and
DMI constant D = 3 × 10-3 J/m2. The direction of the electron polarization (P = 0.4) is
in-plane and makes a 90 degrees angle with the length-axis of the racetrack, which
ensures that the skyrmion is driven by the current moving along the racetrack towards
right but touching the upper track border. The component of magnetization perpendicular
to the viewing plane is color coded (teal blue is into the plane, red is out of the plane,
white is in-plane).
*
E-mail: zhaogp@uestc.edu.cn
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Supplementary Movie 3. Vertical-current-driven motion of skyrmionic bit chain with
initial spacing of 60 nm on the 40-nm-wide normal racetrack within 10 ns. The current
density j = 5 × 1010 A/m2, polarization P = 0.4 and DMI constant D = 3 × 10-3 J/m2. The
component of magnetization perpendicular to the viewing plane is color coded (teal blue
is into the plane, red is out of the plane, white is in-plane).
Supplementary Movie 4. Vertical-current-driven motion of skyrmionic bit chain with
initial spacing of 60 nm on the 40-nm-wide notched racetrack within 5 ns. The current
density j = 5 × 1010 A/m2, polarization P = 0.4 and DMI constant D = 3 × 10-3 J/m2. The
component of magnetization perpendicular to the viewing plane is color coded (teal blue
is into the plane, red is out of the plane, white is in-plane).
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