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Title: Proximity Spin–Orbit Torque on a Two-Dimensional Magnet within van der Waals Heterostructure: Current-Driven Antiferromagnet-to-Ferromagnet Reversible Nonequilibrium Phase Transition in Bilayer CrI3

Journal Article · · Nano Letters

The recently discovered two-dimensional magnetic insulator CrI3 is an intriguing case for basic research and spintronic applications since it is a ferromagnet in the bulk but an antiferromagnet in bilayer form, with its magnetic ordering amenable to external manipulations. Using the first-principles quantum transport approach, we predict that injecting unpolarized charge current parallel to the interface of the bilayer-CrI3/monolayer-TaSe2 van der Waals (vdW) heterostructure will induce spin–orbit torque and thereby drive the dynamics of magnetization on the first monolayer of CrI3 in direct contact with TaSe2. By combining the calculated complex angular dependence of spin–orbit torque with the Landau-Lifshitz-Gilbert equation for classical dynamics of magnetization, we demonstrate that current pulses can switch the direction of magnetization on the first monolayer to become parallel to that of the second monolayer, thereby converting CrI3 from antiferromagnet to ferromagnet while not requiring any external magnetic field. We explain the mechanism of this reversible current-driven nonequilibrium phase transition by showing that first monolayer of CrI3 carries current due to evanescent wave functions injected by metallic transition metal dichalcogenide TaSe2, while concurrently acquiring strong spin–orbit coupling via such a proximity effect, whereas the second monolayer of CrI3 remains insulating. Furthermore, the transition can be detected by passing vertical read current through the vdW heterostructure, encapsulated by a bilayer of hexagonal boron nitride and sandwiched between graphite electrodes, where we find a tunneling magnetoresistance of ≃240%.

Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
SC0016380; ACI-1053575
OSTI ID:
1886895
Journal Information:
Nano Letters, Vol. 20, Issue 4; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (53)

Absence of Ferromagnetism or Antiferromagnetism in One- or Two-Dimensional Isotropic Heisenberg Models journal November 1966
Recent advances in spin-orbit torques: Moving towards device applications journal September 2018
Transverse Spin-Gradient Functional for Noncollinear Spin-Density-Functional Theory journal October 2013
Stacking tunable interlayer magnetism in bilayer CrI 3 journal April 2019
Intrinsic spin-orbit torque in a single-domain nanomagnet journal December 2017
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
Spatially and time-resolved magnetization dynamics driven by spin–orbit torques journal August 2017
Composite super-moiré lattices in double-aligned graphene heterostructures journal December 2019
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Electrical control of 2D magnetism in bilayer CrI3 journal April 2018
Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling journal May 2018
First-principles calculation of spin-orbit torque in a Co/Pt bilayer journal January 2019
Density-functional theory and strong interactions: Orbital ordering in Mott-Hubbard insulators journal August 1995
Giant spin-orbit-induced spin splitting in two-dimensional transition-metal dichalcogenide semiconductors journal October 2011
Quantum kinetic theory of current-induced torques in Rashba ferromagnets journal July 2012
Intrinsic Van Der Waals Magnetic Materials from Bulk to the 2D Limit: New Frontiers of Spintronics journal May 2019
Nonequilibrium spin texture within a thin layer below the surface of current-carrying topological insulator Bi 2 Se 3 : A first-principles quantum transport study journal November 2015
Spin Currents and Spin Dynamics in Time-Dependent Density-Functional Theory journal October 2001
Two‐Dimensional Magnets: Forgotten History and Recent Progress towards Spintronic Applications journal May 2019
Spin-orbit torques in Co/Pt(111) and Mn/W(001) magnetic bilayers from first principles journal November 2014
Two-dimensional magnetic crystals and emergent heterostructure devices journal February 2019
Nonequilibrium Many-Body Theory of Quantum Systems book March 2013
Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers journal January 2020
Controlling magnetism in 2D CrI3 by electrostatic doping journal May 2018
Spin and Charge Pumping by a Steady or Pulse-Current-Driven Magnetic Domain Wall: A Self-Consistent Multiscale Time-Dependent Quantum-Classical Hybrid Approach journal November 2018
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals journal April 2017
First-principles study of the angular dependence of the spin-orbit torque in Pt/Co and Pd/Co bilayers journal June 2018
Electric-field switching of two-dimensional van der Waals magnets journal March 2018
Proximity exchange effects in MoSe 2 and WSe 2 heterostructures with CrI 3 : Twist angle, layer, and gate dependence journal August 2019
Effect of dimensionality and spin-orbit coupling on charge-density-wave transition in 2H-TaSe 2 journal September 2012
Scattering-induced and highly tunable by gate damping-like spin-orbit torque in graphene doubly proximitized by two-dimensional magnet Cr 2 Ge 2 Te 6 and monolayer WS 2 journal October 2020
Stacking-Dependent Magnetism in Bilayer CrI 3 journal November 2018
Control of spin–orbit torques through crystal symmetry in WTe2/ferromagnet bilayers journal November 2016
Large Tunneling Magnetoresistance in VSe 2 /MoS 2 Magnetic Tunnel Junction journal April 2019
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems journal September 2019
Antidamping spin-orbit torque driven by spin-flip reflection mechanism on the surface of a topological insulator: A time-dependent nonequilibrium Green function approach journal March 2016
Multiscale modeling of current-induced switching in magnetic tunnel junctions using ab initio spin-transfer torques journal December 2017
Spin-torque building blocks journal December 2013
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit journal June 2017
Highly Efficient Spin–Orbit Torque and Switching of Layered Ferromagnet Fe 3 GeTe 2 journal June 2019
Semiempirical GGA-type density functional constructed with a long-range dispersion correction journal January 2006
Proximity Band Structure and Spin Textures on Both Sides of Topological-Insulator/Ferromagnetic-Metal Interface and Their Charge Transport Probes journal August 2017
Magnetism in two-dimensional van der Waals materials journal October 2018
Spin polarization of conduction electrons induced by electric current in two-dimensional asymmetric electron systems journal January 1990
Symmetry and magnitude of spin–orbit torques in ferromagnetic heterostructures journal July 2013
Optimization algorithm for the generation of ONCV pseudopotentials journal November 2015
Magnetic 2D materials and heterostructures journal May 2019
Giant tunneling magnetoresistance in spin-filter van der Waals heterostructures journal May 2018
Voltage Control of a van der Waals Spin-Filter Magnetic Tunnel Junction journal January 2019
On the origin of magnetic anisotropy in two dimensional CrI 3 journal June 2017
Very large tunneling magnetoresistance in layered magnetic semiconductor CrI3 journal June 2018
Robust intrinsic ferromagnetism and half semiconductivity in stable two-dimensional single-layer chromium trihalides journal January 2015
Anisotropic magnetoresistance driven by surface spin-orbit scattering journal July 2015