This title appears in the Scientific Report :
2017
Spin-orbit torques in noncollinear magnets from first-principles density-functional theory
Spin-orbit torques in noncollinear magnets from first-principles density-functional theory
While spin-orbit torques [1] in magnetic bilayers composed of a 5d transition metal layer and a ferromagnetic layer can serve as a competitive alternative to the Slonczewski spin-transfer torque in spin-valves and magnetic tunnel junctions in order to realize MRAM devices, spin-orbit torques have ev...
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Personal Name(s): | Freimuth, Frank (Corresponding author) |
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Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 JARA - HPC; JARA-HPC JARA-FIT; JARA-FIT Quanten-Theorie der Materialien; PGI-1 |
Imprint: |
2017
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Conference: | EMN Summer Meeting 2017, Havana (Cuba), 2017-05-04 - 2017-05-07 |
Document Type: |
Conference Presentation |
Research Program: |
Controlling Spin-Based Phenomena |
Publikationsportal JuSER |
While spin-orbit torques [1] in magnetic bilayers composed of a 5d transition metal layer and a ferromagnetic layer can serve as a competitive alternative to the Slonczewski spin-transfer torque in spin-valves and magnetic tunnel junctions in order to realize MRAM devices, spin-orbit torques have even more potential, and are a potential game-changer, in antiferromagnetic spintronics [2] and in noncollinear magnets. In this talk we will focus on current-induced torques and spin-orbit driven effects in noncollinear magnetic bilayers. The combination of structural inversion asymmetry present in the bilayer geometry with noncollinear magnetism leads to several additional spin-orbit driven effects, such as the Dzyaloshinskii-Moriya interaction [3,4,5,6] and chiral damping [7], which join the other effects and current-induced torques important in noncollinear magnets and magnetic bilayers, such as spin-transfer torque, spin-orbit torque and nonadiabatic torque. In particular the combined action of the Dzyaloshinskii-Moriya interaction and the spin-orbit torque from the spin Hall effect enables current-driven domain-wall motion at ultrahigh speeds [8,9]. The large number of current-induced torques and spin-orbit driven effects participating in the current-induced motion of domain-walls or skyrmions are difficult to disentangle and to quantify in experimental measurements. First-principles density functional theory is an ideal tool to understand and to quantify these effects. For this purpose we extend our computational formalism of spin-orbit torques [10,11] to noncollinear magnets. An important problem in the formalism development concerns the correct inclusion of vertex corrections, without which several components of the current-induced torques in noncollinear chiral magnets would violate conservation laws. We will discuss the current-induced torques and spin-orbit driven effects that arise from the combination of structural inversion asymmetry, spin-orbit coupling, and noncollinear magnetism in Co/Pt and Mn/W bilayer systems. |