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19 April 2024 |
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Article overview
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Compensated magnetic insulators for extremely fast spin-orbitronics | | Heng-An Zhou
; Yiqing Dong
; Teng Xu
; Kun Xu
; Luis Sánchez-Tejerina
; Le Zhao
; You Ba
; Pierluigi Gargiani
; Manuel Valvidares
; Yonggang Zhao
; Mario Carpentieri
; Oleg A. Tretiakov
; Xiaoyan Zhong
; Giovanni Finocchio
; Se Kwon Kim
; Wanjun Jiang
; | | Date: |
4 Dec 2019 | | Abstract: | The fast spin dynamics provide many opportunities for the future
communication and memory technologies. One of the most promising examples is
the domain wall (DW) racetrack memory. To achieve fast device performances, the
high-speed motion of DWs is naturally demanded that leaves antiferromagnets
(AFMs) and compensated ferrimagnets (FIMs) as the promising materials. While
controlling and probing the dynamics of DWs in AFMs remains challenging, the
fast motion of DWs with velocities around 1500 m/s has been demonstrated in
metallic FIMs. The velocity of DWs in metallic FIMs is, however, suppressed by
the magnetic damping of conduction electrons, which motivates us to explore how
fast DWs can move in insulating FIMs where the conduction electron is absent.
In this work, through synthesizing compensated FIM insulator Gd3Fe5O12 thin
films with a perpendicular magnetic anisotropy, we demonstrate that the
spin-orbit torque (SOT) induced motion of DWs along the Gd3Fe5O12/Pt racetrack
can approach 6000 m/s. Our results show that the exceptionally fast motion of
DWs can be achieved in compensated FIM insulators owing to small damping
inherent to magnetic insulators, which could potentially facilitate the
emerging ultrahigh-speed spintronic logics and racetrack memories by
introducing insulating compensated FIMs as a new material platform. | | Source: | arXiv, 1912.1775 | | Services: | Forum | Review | PDF | Favorites | |
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