Publisher DOI: 10.1063/5.0101411
Title: Defect-induced magnetism in homoepitaxial SrTiO3
Language: English
Authors: Rata, A. Diana 
Herrero-Martin, Javier 
Maznichenko, Igor V. 
Chiabrera, Francesco Maria 
Dahm, Rasmus Tindal 
Ostanin, Sergey 
Lee, Dooyong 
Jalan, Bharat 
Buczek, Pawel  
Mertig, Ingrid 
Sanders, Ernst A. 
Ionescu, Mihai Adrian 
Dörr, Kathrin 
Pryds, Nini 
Park, Dae-Sung 
Issue Date: 20-Sep-2022
Publisher: AIP Publ.
Journal or Series Name: APL materials 
Volume: 10
Issue: 9
Startpage: 091108-1
Endpage: 091108-9
Along with recent advancements in thin-film technologies, the engineering of complex transition metal oxide heterostructures offers the possibility of creating novel and tunable multifunctionalities. A representative complex oxide is the perovskite strontium titanate (STO), whose bulk form is nominally a centrosymmetric paraelectric band insulator. By tuning the electron doping, chemical stoichiometry, strain, and charge defects of STO, it is possible to control the electrical, magnetic, and thermal properties of such structures. Here, we demonstrate tunable magnetism in atomically engineered STO thin films grown on STO (001) substrates by controlling the atomic charge defects of titanium (VTi) and oxygen (VO) vacancies. Our results show that the magnetism can be tuned by altering the growth conditions. We provide deep insights into its association to the following defect types: (i) VTi, resulting in a charge rearrangement and local spin polarization, (ii) VO, leading to weak magnetization, and (iii) VTi–VO pairs, which lead to the appearance of a sizable magnetic signal. Our results suggest that controlling charged defects is critical for inducing a net magnetization in STO films. This work provides a crucial step for designing magnetic STO films via defect engineering for magnetic and spin-based electronic applications.
ISSN: 2166-532X
Review status: This version was peer reviewed (peer review)
Institute: Fakultät Technik und Informatik 
Department Informations- und Elektrotechnik 
Type: Article
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