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

Abstract

The depth-dependent magnetization in thin film oxygen stoichiometric and oxygen-deficient La 0.7Sr 0.3MnO 3 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,more » the study reveals further details of the negative magnetization in La 0.7Sr 0.3MnO 3 reported in previous studies, which are discussed here.« less

Authors:
 [1]; ORCiD logo [2];  [1];  [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [4];  [3]; ORCiD logo [2];  [1]
  1. West Virginia Univ., Morgantown, WV (United States)
  2. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
  3. North Carolina State Univ., Raleigh, NC (United States)
  4. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1594013
Grant/Contract Number:  
SC0016176; DMR-1608656
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 10; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; interface; segregation

Citation Formats

Trappen, Robbyn, Grutter, Alexander J., Huang, Chih-Yeh, Penn, Aubrey, Mottaghi, Navid, Yousefi, Saeed, Haertter, Allison, Kumari, Shalini, LeBeau, James, Kirby, Brian J., and Holcomb, Mikel B. Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films. United States: N. p., 2019. Web. doi:10.1063/1.5111858.
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. Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films. United States. doi:10.1063/1.5111858.
Trappen, Robbyn, Grutter, Alexander J., Huang, Chih-Yeh, Penn, Aubrey, Mottaghi, Navid, Yousefi, Saeed, Haertter, Allison, Kumari, Shalini, LeBeau, James, Kirby, Brian J., and Holcomb, Mikel B. Mon . "Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films". United States. doi:10.1063/1.5111858.
@article{osti_1594013,
title = {Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films},
author = {Trappen, Robbyn and Grutter, Alexander J. and Huang, Chih-Yeh and Penn, Aubrey and Mottaghi, Navid and Yousefi, Saeed and Haertter, Allison and Kumari, Shalini and LeBeau, James and Kirby, Brian J. and Holcomb, Mikel B.},
abstractNote = {The depth-dependent magnetization in thin film oxygen stoichiometric and oxygen-deficient La0.7Sr0.3MnO3 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 La0.7Sr0.3MnO3 reported in previous studies, which are discussed here.},
doi = {10.1063/1.5111858},
journal = {Journal of Applied Physics},
number = 10,
volume = 126,
place = {United States},
year = {2019},
month = {9}
}

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