Direct imaging revealing halved ferromagnetism in tensile-strained LaCoO3 thin films

Ferromagnetic insulating state in tensile-strained LaCoO3 thin films from LDA+U calculations

With local density approximation+Hubbard U (LDA+U ) calculations, we show that the ferromagnetic (FM) insulating state observed in tensile-strained LaCoO3 epitaxial thin films is most likely a mixture of low-spin (LS) and high-spin (HS) Co, namely, a HS/LS mixture state. Compared with other FM states, including the intermediate-spin (IS) state (metallic within LDA+U ), which consists of IS Co o...

Phase separation and electrical switching between two isosymmetric multiferroic phases in tensile strained BiFeO3 thin films

Jin Hong Lee,1 Kanghyun Chu,1 Ahmet A. Ünal,2 Sergio Valencia,2 Florian Kronast,2 Stefan Kowarik,3 Jan Seidel,4 and Chan-Ho Yang1,5,* 1Department of Physics, KAIST, Yuseong-gu, Daejeon 305-701, Republic of Korea 2Helmholtz Zentrum Berlin, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany 3Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, D...

Ferromagnetism in inhomogeneous Zn1−xCoxO thin films

We report on a systematic study of structural, optical, electrical, and magnetic properties of Zn1−xCoxO x=0.05–0.29 thin films codoped with Al 0.1% . Both codoped in which Co is cosputtered with other elements and -doped in which Co is doped digitally in the host matrix samples have been prepared and studied. Prior to doping of Co, growth conditions were optimized to produce ZnO:Al films with ...

Quantum-well-induced ferromagnetism in thin films

Ferromagnetism in nanocrystalline epitaxial Co:TiO2 thin films