Vibrational EELS was performed as part of a user proposal at the Oak Ridge National Laboratory (ORNL), the Center for Nanophase Materials Sciences (CNMS), which is a U.S. Department of Energy, Office of Science User Facility (J.A.H.). Work at Vanderbilt was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division grant No. DE-FG02-09ER
46554. The authors thank Prof. Ramesh Ramamoorthy, Prof. Jayakanth Ravichandran for providing the thin films
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