Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E35: Magnetic Interactions at Complex Oxide InterfacesInvited Live
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Sponsoring Units: GMAG Chair: Alexander Grutter, National Institute of Standards and Technology |
Tuesday, March 16, 2021 8:00AM - 8:36AM Live |
E35.00001: New functionalities at oxide interfaces: Ultralow-power magnetization switching by orbital selection and high-mobility two-dimensional hole/electron transport Invited Speaker: Le Duc Anh We present our recent findings: 1) Low-power magnetization control utilizing peculiar electronic structures of magnetic perovskite oxide interfaces [1,2], and 2) realization of a high-mobility two-dimensional “hole” gas (2DHG) and electron gas (2DEG) at an oxide interface [3]. Both results are promising for future oxide-based electronics. |
Tuesday, March 16, 2021 8:36AM - 9:12AM Live |
E35.00002: Spin-orbit coupling, local magnetism and Kondo scattering at a complex oxide interface Invited Speaker: Vlad Pribiag SrTiO3-based thin-film heterostructures are a powerful platform for studying a wide array of electronic phases in two dimensions, at high carrier densities. I will discuss our low-temperature electronic transport studies of NdTiO3/SrTiO3 interfaces, which reveal an interplay between local ferromagnetic order, Kondo scattering and spin-orbit coupling. As the magnetic field angle is gradually tilted away from the sample normal, the data reveal an intriguing interplay between strong k-cubic Rashba-type spin-orbit coupling and a substantial magnetic exchange interaction from local magnetic regions. The resulting quantum corrections to the conduction are in excellent agreement with existing models and allow sensitive determination of the small magnetic moments (on the order of 10 µB per region on average), their magnetic anisotropy and mutual coupling strength. This effect is expected to arise in other 2D magnetic materials systems and could provide a simple yet powerful tool for investigating local magnetism. |
Tuesday, March 16, 2021 9:12AM - 9:48AM Live |
E35.00003: Symmetry Control of Emergent Magnetism in 2D Oxide Monolayer and Heterostructures Invited Speaker: Xiaofang Zhai We study the magnetism and magnetic anisotropy of the few layer oxides kept in heterostrucutres or superlattices. Despite the challenge of probing the magnetism in monolayer and few layer thicknesses, we performed comprehensive experiments to reveal the nature of the emergent magnetism. Taking the monolayer and bilayer SrRuO3 as examples, we studied one or two layers of SrRuO3 kept in superlattices of (SrRuO3)M/(SrTiO3)N . We found a number of evidences that indicate the magnetism in such 2D SrRuO3 layers is ferromagnetic. Moreover, we found that the magnetic easy axis of Ru spins in monolayer SrRuO3 is transformed from uniaxial 〈001〉 direction (N < 3) to eightfold 〈111〉 directions (N ≥ 3). This eightfold anisotropy enables 71° and 109° spin switching in SrRuO3 monolayers, analogous to 71° and 109° polarization switching in ferroelectric BiFeO3. |
Tuesday, March 16, 2021 9:48AM - 10:24AM Live |
E35.00004: Interfacial tuning of chiral magnetic interactions for large topological Hall effects in LaMnO3/SrIrO3 heterostructures Invited Speaker: Elizabeth Skoropata One of the most intriguing outcomes of symmetry breaking and spin-obit interactions in magnetic systems is the possibility to create non-collinear and chiral spin textures. The Dzyaloshinskii-Moriya interaction (DMI) results from strong spin-orbit coupling and broken inversion symmetry to generate magnetization rotations with fixed chirality. The discovery of magnetic skyrmions originating from strong DMI in metal thin films has led to an explosion of efforts to manipulate magnetic phases originating from interfaces. We have studied interface-induced magnetism in epitaxial 3d/5d iridate/manganite superlattices. In LaMnO3/SrIrO3 superlattices, we find a large additional topological Hall effect arising from the interaction of charge carriers with a noncoplanar chiral spin texture induced by interfacial DMI[1]. I will describe how the interfacial atomic layer stacking and symmetry enabled by the nonmagnetic A-sites determine the competition between collinear and chiral magnetic interactions originating from the oxide interface. Our findings [2] provide insight to the manipulation of chiral magnetism from atomic-scale control of exchange interactions at oxide interfaces. |
Tuesday, March 16, 2021 10:24AM - 11:00AM On Demand |
E35.00005: Spin to charge conversion in the topological insulator HgTe and in STO-based two-dimensional electron gas Invited Speaker: Jean-Phillippe Attane While classical spintronics has traditionally relied on ferromagnetic metals as spin generators and spin detectors, a new approach called spin-orbitronics exploits the interplay between charge and spin currents enabled by the spin-orbit coupling in non-magnetic systems, in particular using the spin Hall effect. However, the interconversion efficiency of the direct and inverse spin Hall effect is a bulk property that rarely exceeds ten percent, and does not take advantage of interfacial and low-dimensional effects otherwise ubiquitous in spintronics. |
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