Repository logo
 

Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films.

Accepted version
Peer-reviewed

Change log

Authors

Zhu, Bonan 
He, Qian 
Borisevich, Albina Y 
Yun, Chao 

Abstract

Ultrathin epitaxial films of ferromagnetic insulators (FMIs) with Curie temperatures near room temperature are critically needed for use in dissipationless quantum computation and spintronic devices. However, such materials are extremely rare. Here, a room-temperature FMI is achieved in ultrathin La0.9Ba0.1MnO3 films grown on SrTiO3 substrates via an interface proximity effect. Detailed scanning transmission electron microscopy images clearly demonstrate that MnO6 octahedral rotations in La0.9Ba0.1MnO3 close to the interface are strongly suppressed. As determined from in situ X-ray photoemission spectroscopy, O K-edge X-ray absorption spectroscopy, and density functional theory, the realization of the FMI state arises from a reduction of Mn eg bandwidth caused by the quenched MnO6 octahedral rotations. The emerging FMI state in La0.9Ba0.1MnO3 together with necessary coherent interface achieved with the perovskite substrate gives very high potential for future high performance electronic devices.

Description

Keywords

ABO3 perovskite oxides, ferromagnetic insulators, interface engineering, manganite thin films, octahedral proximity effect

Journal Title

Adv Sci (Weinh)

Conference Name

Journal ISSN

2198-3844
2198-3844

Volume Title

7

Publisher

Wiley
Sponsorship
Engineering and Physical Sciences Research Council (EP/N004272/1)
Leverhulme Trust (RPG-2015-017)
Engineering and Physical Sciences Research Council (EP/L011700/1)
Engineering and Physical Sciences Research Council (EP/P007767/1)
Engineering and Physical Sciences Research Council (EP/P027032/1)