Ferromagnetism and spin-dependent transport at a complex oxide interface

Abstract

Complex oxide interfaces are a promising platform for studying a wide array of correlated electron phenomena in low-dimensions, including magnetism and superconductivity. The microscopic origin of these phenomena in complex oxide interfaces remains an open question. Here we investigate for the first time the magnetic properties of semi-insulating NdTiO${}_3$/SrTiO${}_3$ (NTO/STO) interfaces and present the first milli-Kelvin study of NTO/STO. The magnetoresistance (MR) reveals signatures of local ferromagnetic order and of spin-dependent thermally-activated transport, which are described quantitatively by a simple phenomenological model. We discuss possible origins of the interfacial ferromagnetism. In addition, the MR also shows transient hysteretic features on a timescale of ~10-100 seconds. We demonstrate that these are consistent with an extrinsic magneto-thermal origin, which may have been misinterpreted in previous reports of magnetism in STO-based oxide interfaces. The existence of these two MR regimes (steady-state and transient) highlights the importance of time-dependent measurements for distinguishing signatures of ferromagnetism from other effects that can produce hysteresis at low temperatures.

References in corpus (29)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Coexistence of superconductivity and ferromagnetism in two dimensions
• A possible path to a new class of ferromagnetic and half metallic ferromagnetic materials
• Precise quantization of anomalous Hall effect near zero magnetic field
• Two-dimensional superconductivity at a Mott-Insulator/Band-Insulator interface: LaTiO3/SrTiO3
• Lattice relaxation, electronic screening, and spin and orbital phase diagram of LaTiO${}_3$/SrTiO${}_3$ superlattices
• Electrostatic carrier doping of GdTiO3/SrTiO3 interfaces
• LaAlO3 stoichiometry found key to electron liquid formation at LaAlO3/SrTiO3 interfaces
• Critical thickness for ferromagnetism in LaAlO3/SrTiO3 heterostructures
• Origin of interface magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 heterostructures
• Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO_3/SrTiO_3 interface
• Magnetism and superconductivity at LAO/STO-interfaces: the role of Ti 3d interface electrons
• Temperature dependence of the coercive field in single-domain particle systems
• A Gate-tunable Polarized Phase of Two-Dimensional Electrons at the LaAlO3/SrTiO3 Interface
• Controlling the density of the 2DEG at the SrTiO3/LaAlO3 interface
• Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices
• Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface
• Carrier-controlled ferromagnetism in SrTiO3
• Upper limit to magnetism in LaAlO3/SrTiO3 heterostructures
• Nature of weak magnetism in SrTiO3/LaAlO3 multilayers
• Emergent nanoscale superparamagnetism at oxide interfaces
• Surface magnetism of strontium titanate
• Unconventional magnetization processes and thermal runaway in spin-ice Dy${}_2$Ti${}_2$O${}_7$
• Competition Between Kondo Screening and Magnetism at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Interface-driven ferromagnetism within the quantum wells of a rare earth titanate superlattice

Cited by in corpus (5)

• Probing Emergent Surface and Interfacial Properties in Complex Oxides via in situ X-ray Photoelectron Spectroscopy
• Revealing the Altermagnetism in Hematite via XMCD Imaging and Anomalous Hall Electrical Transport
• From Weak Antilocalization to Kondo Scattering in a Magnetic Complex Oxide Interface
• Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system
• Hopping Transport in SrTiO3/Nd1-xTiO3/SrTiO3 Heterostructures