XMCD study of magnetism and valence state in iron-substituted strontium titanate
Name
PhysRevMaterials.3.054408.pdf
Description
Published version
Size
1.82 MB
Format
Adobe PDF
Checksum (MD5)
e923676d545e5c404767d4412bd5f9b2
Author(s)
Tang, Astera S
Pelliciari, Jonathan
Song, Qi
Song, Qian
Ning, Shuai
Freeland, John W
Comin, Riccardo
Ross, Caroline A
Date Issued
2019
Journal
Physical Review Materials
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 American Physical Society. Roomerature ferromagnetism was characterized for thin films of SrTi0.6Fe0.4O3-δ grown by pulsed laser deposition on SrTiO3 and Si substrates under different oxygen pressures and after annealing under oxygen and vacuum conditions. X-ray magnetic circular dichroism demonstrated that the magnetization originated from Fe2+ cations, whereas Fe3+ and Ti4+ did not contribute. Films with the highest magnetic moment (0.8μB per Fe) had the highest measured Fe2+:Fe3+ ratio of 0.1 corresponding to the largest concentration of oxygen vacancies (δ=0.19). Postgrowth annealing treatments under oxidizing and reducing conditions demonstrated quenching and partial recovery of magnetism respectively, and a change in Fe valence states. The study elucidates the microscopic origin of magnetism in highly Fe-substituted SrTi1-xFexO3-δ perovskite oxides and demonstrates that the magnetic moment, which correlates with the relative content of Fe2+ and Fe3+, can be controlled via the oxygen content, either during growth or by postgrowth annealing.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevMaterials.3.054408
