Highly Tunable Ferromagnetic 2D Electron Gases at Oxide Interfaces
Hyungki Shin, Chong Liu, Simon Godin, Fengmiao Li, Ronny Sutarto, B. A. Davidson, Ke Zou
Abstract
Abstract Quantum phenomena such as superconductivity usually emerge in strongly correlated oxide systems as the result of the interplay of spin, charge, and orbital degrees of freedom. Adding ferromagnetism to two‐dimensional electron gases (2DEGs) at oxide interfaces is intriguing due to their scientifically exotic and technically valuable properties, which may lead to new fundamental understanding and multifunctional applications. Here, ferromagnetic 2DEGs at the interface of polar antiferromagnetic LaTiO 3 and nonpolar antiferromagnetic EuTiO 3 are generated. The magnetotransport properties of these 2DEGs depend on the thickness of LaTiO 3 that determines the carrier concentration, with all showing robust ferromagnetism up to 5.5 K. This magnetism is intrinsic to the strongly‐correlated 2D electron system and is highly sensitive and tunable based on the sample configuration. Thus, a prototype oxide system with magnetic functionality for spintronics and ferromagnetic semiconductors has been developed.