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Current-Induced Circular Dichroism on Metallic Surfaces: A First-Principles Study
Farzad Mahfouzi, Mark D. Stiles, Paul M. Haney
We use {\it ab initio} calculations to understand the current-induced optical response and orbital moment accumulation at the surfaces of metallic films. These two quantities are r…
Breakdown of the drift-diffusion model for transverse spin transport in a disordered Pt film
K. D. Belashchenko, G. G. Baez Flores, W. Fang +4
Spin accumulation and spin current profiles are calculated for a disordered Pt film subjected to an in-plane electric current within the nonequilibrium Green function approach. In…
Mutual control of stochastic switching for two electrically coupled superparamagnetic tunnel junctions
Philippe Talatchian, Matthew W. Daniels, Advait Madhavan +5
Superparamagnetic tunnel junctions (SMTJs) are promising sources for the randomness required by some compact and energy-efficient computing schemes. Coupling SMTJs gives rise to co…
Phase-resolved electrical detection of coherently coupled magnonic devices
Yi Li, Chenbo Zhao, Vivek P. Amin +10
We demonstrate the electrical detection of magnon-magnon hybrid dynamics in yttrium iron garnet/permalloy (YIG/Py) thin film bilayer devices. Direct microwave current injection thr…
Roadmap of spin-orbit torques
Qiming Shao, Peng Li, Luqiao Liu +16
Spin-orbit torque (SOT) is an emerging technology that enables the efficient manipulation of spintronic devices. The initial processes of interest in SOTs involved electric fields,…
Interfacial spin-orbit torques
Vivek P. Amin, Paul M. Haney, Mark D. Stiles
Spin-orbit torques offer a promising mechanism for electrically controlling magnetization dynamics in nanoscale heterostructures. While spin-orbit torques occur predominately at in…
Coherent spin pumping in a strongly coupled magnon-magnon hybrid system
Yi Li, Wei Cao, Vivek P. Amin +10
We experimentally identify coherent spin pumping in the magnon-magnon hybrid modes of permalloy/yttrium iron garnet (Py/YIG) bilayers. Using broadband ferromagnetic resonance, an "…
Intrinsic spin currents in ferromagnets
V. P. Amin, Junwen Li, M. D. Stiles +1
First principles calculations show that electric fields applied to ferromagnets generate spin currents flowing perpendicularly to the electric field. Reduced symmetry in these ferr…
Interface-generated spin currents
V. P. Amin, J. Zemen, M. D. Stiles
Transport calculations based on ab-initio band structures reveal large interface-generated spin currents at Co/Pt, Co/Cu, and Pt/Cu interfaces. These spin currents are driven by in…
Spin waves in coupled YIG/Co heterostructures
Stefan Klingler, Vivek Amin, Stephan Geprägs +9
We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing sp…
Spin-orbit torques from interfacial spin-orbit coupling for various interfaces
Kyoung-Whan Kim, Kyung-Jin Lee, Jairo Sinova +2
We use a perturbative approach to study the effects of interfacial spin-orbit coupling in magnetic multilayers by treating the two-dimensional Rashba model in a fully three-dimensi…
Theory of Kondo suppression of spin polarization in nonlocal spin valves
Kyoung-Whan Kim, Liam O'Brien, Paul A. Crowell +2
We theoretically analyze contributions from the Kondo effect to the spin polarization and spin diffusion length in all-metal nonlocal spin valves. Interdiffusion of ferromagnetic a…
Spin-transfer torque in ferromagnetic bilayers generated by anomalous Hall effect and anisotropic magnetoresistance
Tomohiro Taniguchi, Julie Grollier, Mark D. Stiles
We propose an experimental scheme to determine the spin-transfer torque efficiency excited by the spin-orbit interaction in ferromagnetic bilayers from the measurement of the longi…
Perpendicular magnetic anisotropy of two-dimensional Rashba ferromagnets
Kyoung-Whan Kim, Kyung-Jin Lee, Hyun-Woo Lee +1
We compute the magnetocrystalline anisotropy energy within two-dimensional Rashba models. For a ferromagnetic free-electron Rashba model, the magnetic anisotropy is exactly zero re…
Spin Transport at Interfaces with Spin-Orbit Coupling: Formalism
V. P. Amin, M. D. Stiles
We generalize magnetoelectronic circuit theory to account for spin transfer to and from the atomic lattice via interfacial spin-orbit coupling. This enables a proper treatment of s…
Spin Transport at Interfaces with Spin-Orbit Coupling: Phenomenology
V. P. Amin, M. D. Stiles
This paper presents the boundary conditions needed for drift-diffusion models to treat interfaces with spin-orbit coupling. Using these boundary conditions for heavy metal/ferromag…
Critical current and linewidth reduction in spin-torque nano-oscillators by delayed self-injection
Guru Khalsa, M. D. Stiles, J. Grollier
Based on theoretical models, the dynamics of spin-torque nano-oscillators can be substantially modified by re-injecting the emitted signal to the input of the oscillator after some…
Intrinsic Spin Torque Without Spin-Orbit Coupling
Kyoung-Whan Kim, Kyung-Jin Lee, Hyun-Woo Lee +1
We derive an intrinsic contribution to the non-adiabatic spin torque for non-uniform magnetic textures. It differs from previously considered contributions in several ways and can…
Current-induced torques and interfacial spin-orbit coupling
Paul M. Haney, Hyun-Woo Lee, Kyung-Jin Lee +2
In bilayer systems consisting of an ultrathin ferromagnetic layer adjacent to a metal with strong spin-orbit coupling, an applied in-plane current induces torques on the magnetizat…
Chirality from interfacial spin-orbit coupling effects in magnetic bilayers
Kyoung-Whan Kim, Hyun-Woo Lee, Kyung-Jin Lee +1
As nanomagnetic devices scale to smaller sizes, spin-orbit coupling due to the broken structural inversion symmetry at interfaces becomes increasingly important. Here we study inte…
Mechanism for puddle formation in graphene
Shaffique Adam, Suyong Jung, Nikolai N. Klimov +3
When graphene is close to charge neutrality, its energy landscape is highly inhomogeneous, forming a sea of electron-like and hole-like puddles, which determine the properties of g…
Effects of disorder on magnetic vortex gyration
Hongki Min, R. D. McMichael, Jacques Miltat +1
A vortex gyrating in a magnetic disk has two regimes of motion in the presence of disorder. At large gyration amplitudes, the vortex core moves quasi-freely through the disorder po…
Landau Levels and Band Bending in Few-Layer Epitaxial Graphene
Hongki Min, S. Adam, Young Jae Song +3
The carrier density distributions in few-layer-graphene systems grown on the carbon face of silicon carbide can be altered by the presence of a scanning tunneling microscope (STM)…
Semiclassical Boltzmann transport theory for graphene multilayers
Hongki Min, Parakh Jain, S. Adam +1
We calculate the conductivity of arbitrarily stacked multilayer graphene sheets within a relaxation time approximation, considering both short-range and long-range impurities. We t…