Bloch-type domain walls in rhombohedral BaTiO3

First-principles study of 180◦ domain walls in BaTiO3: Mixed Bloch-Néel-Ising character

Menglei Li,1,2,3 Yijia Gu,2 Yi Wang,2 Long-Qing Chen,2,4 and Wenhui Duan1,3,* 1Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, People’s Republic of China 2Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA 3Collaborative Innovation Center of Quantum Matte...

Supercurrent enhancement in Bloch domain walls

Conventional spin-singlet Cooper pairs convert into spin-triplet pairs in ferromagnetic Josephson junctions in which the superconductor/ferromagnet interfaces (S/F) are magnetically inhomogeneous. Although much of the theoretical work describing this triplet proximity effect has considered ideal junctions with magnetic domain walls (DW) at the interfaces, in practice it is not easily possible t...

First-principles investigation of 180° domain walls in BaTiO3

We present a first-principles study of 180° ferroelectric domain walls in tetragonal barium titanate. The theory is based on an effective Hamiltonian that has previously been determined from first-principles ultrasoftpseudopotential calculations. Statistical properties are investigated using Monte Carlo simulations. We compute the domain-wall energy, free energy, and thickness, analyze the beha...

Free-electron gas at charged domain walls in insulating BaTiO3

Hetero interfaces between metal-oxides display pronounced phenomena such as semiconductor-metal transitions, magnetoresistance, the quantum hall effect and superconductivity. Similar effects at compositionally homogeneous interfaces including ferroic domain walls are expected. Unlike hetero interfaces, domain walls can be created, displaced, annihilated and recreated inside a functioning device...

Observation of Bloch-point domain walls in cylindrical magnetic nanowires