Current-Induced Domain Wall Motion and Tilting in Perpendicularly Magnetized Racetracks

The influence of C insertion on Dzyaloshinskii–Moriya interaction (DMI) as well as current-induced domain wall (DW) motion (CIDWM) and tilting in Pt/Co/Ta racetracks is investigated via a magneto-optical Kerr microscope. The similar DMI strength for Pt/Co/Ta and Pt/Co/C/Ta samples reveals that DMI m...

Full description

Saved in:
Bibliographic Details
Published in:Nanoscale research letters 2018-08, Vol.13 (1), p.238-7, Article 238
Main Authors: Li, Dong, Cui, Baoshan, Yun, Jijun, Chen, Minzhang, Guo, Xiaobin, Wu, Kai, Zhang, Xu, Wang, Yupei, Mao, Jian, Zuo, Yalu, Wang, Jianbo, Xi, Li
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Cobalt
Current density
Domain wall motion
Domain wall tilting
Domain walls
Dzyaloshinskii-Moriya interaction
Magnetic fields
Materials Science
Molecular Medicine
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
Ohmic dissipation
Perpendicular magnetic anisotropy
Potential barriers
Racetracks
Resistance heating
Spin-orbit torque
Tantalum
Velocity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The influence of C insertion on Dzyaloshinskii–Moriya interaction (DMI) as well as current-induced domain wall (DW) motion (CIDWM) and tilting in Pt/Co/Ta racetracks is investigated via a magneto-optical Kerr microscope. The similar DMI strength for Pt/Co/Ta and Pt/Co/C/Ta samples reveals that DMI mainly comes from the Pt/Co interface. Fast DW velocity around tens of m/s with current density around several MA/cm 2 is observed in Pt/Co/Ta. However, it needs double times larger current density to reach the same magnitude in Pt/Co/C/Ta, indicating DW velocity is related to the spin-orbit torque efficiency and pinning potential barrier. Moreover, in CIDWM, DW velocity is around 10 3 times larger than that in field-induced DW motion (FIDWM) with current-generated effective field keeping the same magnitude as applied magnetic field, revealing that the current-generated Joule heating has an influence on DW motion. Interestingly, current-induced DW tilting phenomenon is observed, while this phenomenon is absent in FIDWM, demonstrating that the current-generated Oersted field may also play an essential role in DW tilting. These findings could provide some designing prospects to drive DW motion in SOT-based racetrack memories.
ISSN:1931-7573
1556-276X
DOI:10.1186/s11671-018-2655-6