Anomalous magnetic ground state in LaAlO3/SrTiO3 interface probed by transport through nanowires

Abstract

Resistance as a function of temperature down to 20mK and magnetic fields up to 18T for various carrier concentrations is measured for nanowires made from the SrTiO3/LaAlO3 interface using a hard mask shadow deposition technique. The narrow width of the wires (of the order of 50nm) allows us to separate out the magnetic effects from the dominant superconducting ones at low magnetic fields. At this regime hysteresis loops are observed along with the superconducting transition. From our data analysis we find that the magnetic order probed by the giant magnetoresistance (GMR) effect vanishes at TCurie = 954 mK. This order is not a simple ferromagnetic state but consists of domains with opposite magnetization having a preferred in-plane orientation.

5 pages 5 figures

References in corpus (4)

• Magnetic effects at the interface between nonmagnetic oxides
• Nature of weak magnetism in SrTiO3/LaAlO3 multilayers
• One-dimensional Quantum Wire Formed at the Boundary Between Two Insulating LaAlO3/SrTiO3 Interfaces
• Anomalous Transport in Sketched Nanostructures at the LaAlO3/SrTiO3 Interface

Cited by in corpus (5)

• Tunneling into a quantum confinement created by a single-step nano-lithography of conducting oxide interfaces
• Ferroelectric Exchange Bias Affects Interfacial Electronic States
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Correlation-Induced Band Competition in SrTiO3/LaAlO3
• Solution Monolayer Epitaxy for Tunable Atomically Sharp Oxide Interfaces