title: Carrier-dependent magnetic anisotropy of cobalt doped titanium dioxide.
abstract: Using first-principles calculations, we predict that the magnetic anisotropy energy of Co-doped TiO2 sensitively depends on carrier accumulation. This magnetoelectric phenomenon provides a potential route to a direct manipulation of the magnetization direction in diluted magnetic semiconductor by external electric-fields. We calculate the band structures and reveal the origin of the carrier-dependent magnetic anisotropy energy in k-space. It is shown that the carrier accumulation shifts the Fermi energy, and consequently, regulates the competing contributions to the magnetic anisotropy energy. The calculations provide an insight to understanding this magnetoelectric phenomenon, and a straightforward way to search prospective materials for electrically controllable spin direction of carriers.
authors.affiliation: State Key Laboratory of Low-Dimensional Quantum Physics, and Department of Physics Tsinghua University, Beijing 100084, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Shao
authors.affiliation: School of Physics, Nankai University, Tianjin 300071, China.
authors.forename: Min
authors.initials: M
authors.lastname: Feng
authors.affiliation: College of Electronic Information and Optic Engineering, Nankai University, Tianjin 300071, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Zuo