Strongly asymmetric magnetization switching and programmable complete Boolean logic enabled by long-range intralayer Dzyaloshinskii-Moriya interaction
arxiv(2024)
摘要
Electrical switching of magnetization is central to spintronics. Despite the
enormous efforts on the spin torques and the Dzyaloshinskii-Moriya interaction
(DMI) effects, some fundamental physics for electrical switching of
magnetization is still missing as indicated by a number of remarkable
long-standing puzzles. Here, we report the discovery of the long-range
intralayer DMI effect widely existing in magnetic heterostructure, which is
distinct from the yet-known DMI effects as it describes the chiral coupling of
two orthogonal magnetic domains within the same magnetic layer via the
mediation of an adjacent heavy metal layer. The long-range intralayer DMI
generates a strong perpendicular effective magnetic field (H_DMI^z) on the
perpendicular magnetization. Characteristically, H_DMI^z varies with the
sign/magnitude of the interfacial DMI constant, the applied in-plane magnetic
fields, and the distribution of the perpendicular magnetic anisotropy. The
long-range intralayer DMI results in striking consequences including the
strongly asymmetric current/field switching of perpendicular magnetization,
hysteresis loop shift of perpendicular magnetization in the absence of in-plane
direct current, and sharp, complete switching of perpendicular magnetization
purely by an in-plane magnetic field. Utilizing the long-range intralayer DMI
effect, we demonstrate programable, complete Boolean logic operations (i.e.,
AND, NAND, NOT, OR, and NOR) within a single spin-orbit torque device. These
results will stimulate the investigation of the long-range intralayer DMI
effect and its impacts on a variety of spintronic devices.
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