Interfacial chirality-induced magnetic-field-free switching with high energy efficiency in all-vdW heterostructures

• URL: http://arxiv.org/abs/2607.08023v1
• Date: Thu, 09 Jul 2026 00:59:18 GMT
• Title: Interfacial chirality-induced magnetic-field-free switching with high energy efficiency in all-vdW heterostructures
• Abstract summary: Chirality, a central concept across many scientific disciplines, continues to inspire the discovery of novel physical phenomena.<n>Here, we demonstrate that all van-der-Waals (vdW) heterostructure composed of the chiral Co2/3TaS2 and the achiral vdW ferromagnet Fe3GeTe2 exhibits two distinct and unconventional spin-orbit torques.<n>These torques enable magnetic-field-free switching of perpendicular magnetization with ultralow current density 106 A/cm2 and minimal power dissipation 1015 W/m3.
• Score: 3.804310965605886
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Chirality, a central concept across many scientific disciplines, continues to inspire the discovery of novel physical phenomena. In condensed matter physics, structural chirality - defined by the absence of mirror plane symmetries - has primarily been explored in bulk materials. However, new chiral phenomena can emerge uniquely at the interface, distinct from their bulk counterparts, when a chiral material forms a heterostructure. Here, we demonstrate that all van-der-Waals (vdW) heterostructure composed of the chiral Co1/3TaS2 and the achiral vdW ferromagnet Fe3GeTe2 exhibits two distinct and unconventional spin-orbit torques originating from the interfacial chirality. These torques enable magnetic-field-free switching of perpendicular magnetization with ultralow current density ~ 10^6 A/cm^2 and minimal power dissipation < 10^15 W/m^3. Moreover, by replacing Fe3GeTe2 with a similar vdW ferromagnet, Fe3GaTe2, but of higher Curie temperature, we achieved the magnetic-field-free switching at room temperature in the Fe3GaTe2/Co1/3TaS2 vdW heterostructure. Our findings establish interfacial chirality as a powerful new handle for spintronic control, opening a new pathway to explore chirality-induced phenomena beyond the bulk symmetry constraints - and paving the way toward highly efficient, low-power spintronic devices based on all-vdW heterostructures.

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