ABSTRACT
Controlling the magnetic properties of magnetic materials in bulk crystals and at interfaces is crucial for spintronic applications and related phenomena. In this chapter, we will review theoretical studies focused on interfaces or heterostructures of complex oxides such as perovskite transition-metal oxides (TMOs). TMOs have been a focus of materials science for decades because of their exotic behavior originating from strong electron-electron or electron-lattice interactions, including high critical temperature ( https://www.w3.org/1998/Math/MathML"> T c https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429434235/2e0d0afd-bea4-4238-8501-771c5076b7a9/content/TNF-CH011_eqn_0001.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> ) superconductivity in cuprates [1] and colossal magnetoregistance effects in manganites [2, 3]. In fact, after the discovery of high- https://www.w3.org/1998/Math/MathML"> T c https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429434235/2e0d0afd-bea4-4238-8501-771c5076b7a9/content/TNF-CH011_eqn_0002.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> cuprates, crystal growth and measurement techniques have been improved dramatically, and a variety of novel phenomena have been discovered, such as novel metal-insulator transitions and spin charge orbital ordering [4, 5]. Further, the recent progress in thin-film growth techniques led to the discovery of metallic states at interfaces between dissimilar insulators [6, 7]. Thus, while bulk complex TMOs can provide interesting functionalities, heteroengineering of TMOs could also provide additional useful and novel functionalities for applications.
