Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films

Trappen, Robbyn; Grutter, Alexander J.; Huang, Chih-Yeh; Penn, Aubrey; Mottaghi, Navid; Yousefi, Saeed; Haertter, Allison; Kumari, Shalini; LeBeau, James; Kirby, Brian J.; Holcomb, Mikel B.

doi:10.1063/1.5111858

Title: Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films

Journal Article · Mon Sep 09 00:00:00 EDT 2019 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5111858· OSTI ID:1594013

Trappen, Robbyn ^[1];

^[2]; Huang, Chih-Yeh ^[1]; Penn, Aubrey ^[3];

^[1];

^[1]; Kumari, Shalini ^[4]; LeBeau, James ^[3];

^[2]; Holcomb, Mikel B. ^[1]

West Virginia Univ., Morgantown, WV (United States)
National Inst. of Standards and Technology, Gaithersburg, MD (United States)
North Carolina State Univ., Raleigh, NC (United States)
Pennsylvania State Univ., University Park, PA (United States)

The depth-dependent magnetization in thin film oxygen stoichiometric and oxygen-deficient La_0.7Sr_0.3MnO₃ is investigated by using polarized neutron reflectivity and DC bulk magnetometry. The polarized neutron reflectivity results reveal that the stoichiometric sample shows enhanced interfacial magnetization relative to the rest of the film. The oxygen-deficient sample exhibits a reduced average magnetization from the optimized recipe. Both films show regions of suppressed magnetization at the surface regardless of the growth pressure. The oxygen stoichiometric film does not show an interfacial dead layer, whereas the oxygen-deficient film exhibits a dead layer whose thickness changes with temperature. At a low applied field, we observe striking differences in the depth dependence of the magnetic ordering, with the oxygen-deficient film exhibiting exchange spring behavior, while the stoichiometric film shows a constant magnetization direction across the film. Furthermore, these results suggest that the incorporation of oxygen vacancies during growth leads to an accumulation of vacancies at the interface, which is enhanced at higher temperature due to increased oxygen mobility, creating a region of reduced magnetism that couples to the rest of the film. These results offer insight into the complex behavior and role of oxygen vacancies in the magnetism of these systems. Additionally, the study reveals further details of the negative magnetization in La_0.7Sr_0.3MnO₃ reported in previous studies, which are discussed here.

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Research Organization:: West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016176; DMR-1608656

OSTI ID:: 1594013

Journal Information:: Journal of Applied Physics, Vol. 126, Issue 10; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Title: Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films

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