The development of magnetic heterostructures with strong perpendicular magnetic anisotropy(PMA),strong spin-orbit torques(SOTs),low impedance,and good integration compatibility at the same time is central for high-per...The development of magnetic heterostructures with strong perpendicular magnetic anisotropy(PMA),strong spin-orbit torques(SOTs),low impedance,and good integration compatibility at the same time is central for high-performance spintronic memory and computing applications.Here,we report the development of the PMA superlattice[Pt/Co/W]_(n)that can be sputtered-deposited on commercial oxidized silicon substrates and has giant SOTs,strong uniaxial PMA of≈9.2 Merg/cm^(3),and rigid macrospin performance.The damping-like and field-like SOTs of the[Pt/Co/W]_(n)superlattices exhibit a linear increase with the repeat number n and reach the giant values of 225%and-33%(two orders of magnitude greater than that in clean-limit Pt)at n=12,respectively.The damping-like SOT is also of the opposite sign and much greater in magnitude than the field-like SOT,regardless of the number n.These results clarify that the spin current that generates SOTs in the[Pt/Co/W]_(n)superlattices arises predominantly from the spin Hall effect rather than bulk Rashba spin splitting,providing a unified understanding of the SOTs in these superlattices.We also demonstrate deterministic switching in thickerthan-50-nm PMA[Pt/Co/W]_(12)superlattices at a low current density.This work establishes the[Pt/Co/W]_(n)superlattice as a compelling material candidate for ultra-fast,low-power,long-retention nonvolatile spintronic memory and computing technologies.展开更多
The Dzyaloshinskii-Moriya interaction(DMI)plays a crucial role in the formation of chiral magnetic structures,such as chiral domain walls and magnetic skyrmions.Recent studies have revealed that anisotropic DMI can ar...The Dzyaloshinskii-Moriya interaction(DMI)plays a crucial role in the formation of chiral magnetic structures,such as chiral domain walls and magnetic skyrmions.Recent studies have revealed that anisotropic DMI can arise in specific systems or conditions,which is essential for the formation of three-dimensional spin textures.However,the impact of anisotropic DMI on magnetic moment switching has not been comprehensively studied.In this work,we systematically investigate the influence of anisotropic DMI on spin-orbit torque(SOT)-driven magnetization switching,employing a macrospin model to elucidate the underlying mechanisms.Our findings show that anisotropic DMI introduces a pronounced asymmetry in the magnetization reversal process.Simulations based on the Landau-Lifshitz-Gilbert equation further demonstrate that anisotropic DMI not only breaks the symmetry of the switching trajectory but also enhances switching efficiency by reducing the switching time.Furthermore,we demonstrate the realization of five distinct logic operations(AND,NAND,OR,NOR,NOT)within a single device,exploiting the asymmetric SOT-driven magnetization switching induced by anisotropic DMI.Overall,our results not only provide a comprehensive understanding of the role of anisotropic DMI in SOT-driven magnetic switching,but also open new avenues for the engineering of next-generation spintronic devices leveraging DMI.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2022YFA1204000)the Beijing National Natural Science Foundation(Grant No.Z230006)the National Natural Science Foundation of China(Grant Nos.12304155 and 12274405).
文摘The development of magnetic heterostructures with strong perpendicular magnetic anisotropy(PMA),strong spin-orbit torques(SOTs),low impedance,and good integration compatibility at the same time is central for high-performance spintronic memory and computing applications.Here,we report the development of the PMA superlattice[Pt/Co/W]_(n)that can be sputtered-deposited on commercial oxidized silicon substrates and has giant SOTs,strong uniaxial PMA of≈9.2 Merg/cm^(3),and rigid macrospin performance.The damping-like and field-like SOTs of the[Pt/Co/W]_(n)superlattices exhibit a linear increase with the repeat number n and reach the giant values of 225%and-33%(two orders of magnitude greater than that in clean-limit Pt)at n=12,respectively.The damping-like SOT is also of the opposite sign and much greater in magnitude than the field-like SOT,regardless of the number n.These results clarify that the spin current that generates SOTs in the[Pt/Co/W]_(n)superlattices arises predominantly from the spin Hall effect rather than bulk Rashba spin splitting,providing a unified understanding of the SOTs in these superlattices.We also demonstrate deterministic switching in thickerthan-50-nm PMA[Pt/Co/W]_(12)superlattices at a low current density.This work establishes the[Pt/Co/W]_(n)superlattice as a compelling material candidate for ultra-fast,low-power,long-retention nonvolatile spintronic memory and computing technologies.
基金supported by the National Natural Science Foundation of China(Grant Nos.51671098 and 12404142)the Natural Science Basic Research Program of Shaanxi(Program No.2024JC-YBQN-0374)+1 种基金the Natural Science Foundation of Gansu Province(Grant No.22JR5RA474)the Open Fund of the State Key Laboratory of Spintronics Devices and Technologies(Grant No.SPL-2411).
文摘The Dzyaloshinskii-Moriya interaction(DMI)plays a crucial role in the formation of chiral magnetic structures,such as chiral domain walls and magnetic skyrmions.Recent studies have revealed that anisotropic DMI can arise in specific systems or conditions,which is essential for the formation of three-dimensional spin textures.However,the impact of anisotropic DMI on magnetic moment switching has not been comprehensively studied.In this work,we systematically investigate the influence of anisotropic DMI on spin-orbit torque(SOT)-driven magnetization switching,employing a macrospin model to elucidate the underlying mechanisms.Our findings show that anisotropic DMI introduces a pronounced asymmetry in the magnetization reversal process.Simulations based on the Landau-Lifshitz-Gilbert equation further demonstrate that anisotropic DMI not only breaks the symmetry of the switching trajectory but also enhances switching efficiency by reducing the switching time.Furthermore,we demonstrate the realization of five distinct logic operations(AND,NAND,OR,NOR,NOT)within a single device,exploiting the asymmetric SOT-driven magnetization switching induced by anisotropic DMI.Overall,our results not only provide a comprehensive understanding of the role of anisotropic DMI in SOT-driven magnetic switching,but also open new avenues for the engineering of next-generation spintronic devices leveraging DMI.
