XMCD study of magnetism and valence state in iron-substituted strontium titanate

Tang, Astera S.; Pelliciari, Jonathan; Song, Qi; Song, Qian; Ning, Shuai; Freeland, John W.; Comin, Riccardo; Ross, Caroline A.

doi:10.1103/PhysRevMaterials.3.054408

Title: XMCD study of magnetism and valence state in iron-substituted strontium titanate

Journal Article · Fri May 17 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.054408· OSTI ID:1558291

Tang, Astera S. ^[1]; Pelliciari, Jonathan ^[1]; Song, Qi ^[2]; Song, Qian ^[1]; Ning, Shuai ^[1]; Freeland, John W. ^[3]; Comin, Riccardo ^[1]; Ross, Caroline A. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Fudan Univ., Shanghai (China)
Argonne National Lab. (ANL), Argonne, IL (United States)

Room-temperature ferromagnetism was characterized for thin films of SrTi_0.6Fe_0.4O_3–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 (0.8μ_B 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. In conclusion, the study elucidates the microscopic origin of magnetism in highly Fe-substituted SrTi_1–xFe_xO_3–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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Swiss National Science Foundation (SNSF); China Scholarship Council; National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1558291

Alternate ID(s):: OSTI ID: 1513313

Journal Information:: Physical Review Materials, Vol. 3, Issue 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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36 MATERIALS SCIENCE
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Title: XMCD study of magnetism and valence state in iron-substituted strontium titanate

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