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Title: Thickness dependence of La 0.7Sr 0.3MnO 3/PbZr 0.2Ti 0.8O 3 magnetoelectric interfaces

Magnetoelectric materials have great potential to revolutionize electronic devices due to the coupling of their electric and magnetic properties. Thickness varying La 0.7Sr 0.3MnO 3 (LSMO)/PbZr 0.2Ti 0.8O 3 (PZT) heterostructures were built and measured in this article by valence sensitive x-ray absorption spectroscopy. The sizing effects of the heterostructures on the LSMO/PZT magnetoelectric interfaces were investigated through the behavior of Mn valence, a property associated with the LSMO magnetization. Here, we found that Mn valence increases with both LSMO and PZT thickness. Piezoresponse force microscopy revealed a transition from monodomain to polydomain structure along the PZT thickness gradient. The ferroelectric surface charge may change with domain structure and its effects on Mn valence were simulated using a two-orbital double-exchange model. The screening of ferroelectric surface charge increases the electron charges in the interface region, and greatly changes the interfacial Mn valence, which likely plays a leading role in the interfacial magnetoelectric coupling. The LSMO thickness dependence was examined through the combination of two detection modes with drastically different attenuation depths. The different length scales of these techniques' sensitivity to the atomic valence were used to estimate the depth dependence Mn valence. Finally, a smaller interfacial Mn valence than themore » bulk was found by globally fitting the experimental results.« less
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  1. West Virginia Univ., Morgantown, WV (United States). Dept. of Physics and Astronomy
  2. National Chiao Tung Univ., Hsinchu (Taiwan). Inst. of Physics
  3. Southeast Univ., Nanjing (China). Dept. of Physics
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. West Virginia Univ., Morgantown, WV (United States). Dept. of Physics and Astronomy; Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemical Engineering and Material Science
  7. North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering
  8. National Chiao Tung Univ., Hsinchu (Taiwan). Dept. of Materials Science and Engineering; Academia Sinica, Taipei (Taiwan). Inst. of Physics
Publication Date:
Grant/Contract Number:
AC02-05CH11231; HRD-1007978
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 14; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
36 MATERIALS SCIENCE; Lead zirconate titanate; Surface charge; PolarizationX-ray absorption spectroscopy; Double layers
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1420515