Interfacial tuning of chiral magnetic interactions for large topological Hall effects in LaMnO ₃ /SrIrO ₃ heterostructures

Abstract

<jats:p>Chiral interactions in magnetic systems can give rise to rich physics manifested, for example, as nontrivial spin textures. The foremost interaction responsible for chiral magnetism is the Dzyaloshinskii-Moriya interaction (DMI), resulting from inversion symmetry breaking in the presence of strong spin-orbit coupling. However, the atomistic origin of DMIs and their relationship to emergent electrodynamic phenomena, such as topological Hall effect (THE), remain unclear. Here, we investigate the role of interfacial DMIs in 3<jats:italic>d</jats:italic>–5<jats:italic>d</jats:italic> transition metal-oxide-based LaMnO<jats:sub>3</jats:sub>/SrIrO<jats:sub>3</jats:sub> superlattices on THE from a chiral spin texture. By additively engineering the interfacial inversion symmetry with atomic-scale precision, we directly link the competition between interfacial collinear ferromagnetic interactions and DMIs to an enhanced THE. The ability to control the DMI and resulting THE points to a pathway for harnessing interfacial structures to maximize the density of chiral spin textures useful for developing high-density information storage and quantum magnets for quantum information science.</jats:p>

Large intrinsic anomalous Hall effect in SrIrO3 induced by magnetic proximity effect

“…The absence of THE in our samples is likely connected to the interface reconstruction with double SrO planes, which weakens the interfacial DMI because longer Mn-Ir distance suppresses the effect of SOC. This argument is consistent with the fact that inserting an ultrathin insulating layer between SIO and LSMO also suppresses the THE as reported earlier 44 , 45 . The lack of THE, thus, rules out that the observed AHE results from non-collinear spins in the LSMO at the interface.…”

Coupling Charge and Topological Reconstructions at Polar Oxide Interfaces

“…This calls for a different approach where the focus lies not on tuning the position of the Fermi level, but rather on changing the topological charges within the Brillouin zone, i.e., inducing a topological transition. In this respect, oxide heterostructures provide an ideal platform due to the strong breaking of inversion symmetry across the interfaces, especially between materials with different charge states [31][32][33][34].…”

Skyrmion Control of Majorana States in Planar Josephson Junctions

“…Skyrmion tuning of the MBS. The skyrmion size in a SkX is tunable, with remarkable precession, by an external magnetic field, magnetic anisotropy and advanced symmetry protocol at heterointerfaces [47][48][49] . In our Monte Carlo simulations, the skyrmion size was varied by tuning the magnetic field and the DMI, as shown in Figs.…”