Tensor factorization for elucidating mechanisms of piezoresponse relaxation via dynamic Piezoresponse Force Spectroscopy  

作　　者：Kyle P.Kelley Linglong Li Yao Ren Yoshitaka Ehara Hiroshi Funakubo Suhas Somnath Stephen Jesse Ye Cao Ramakrishnan Kannan Rama K.Vasudevan Sergei V.Kalinin 

机构地区：[1]Center for Nanophase Materials Sciences,Oak Ridge National Laboratory,Oak Ridge,TN 37831,USA [2]Department of Physics,Tsinghua University,Beijing,China [3]Department of Materials Science and Engineering,University of Texas at Arlington,Arlington,TX 76019,USA [4]Department of Communications Engineering,National Defense Academy,Hashirimizu,Yokosuka 239-8686,Japan [5]Department of Material Science and Engineering,Tokyo Institute of Technology,Yokohama 226‐8502,Japan [6]National Center for Computational Sciences,Oak Ridge National Laboratory,Oak Ridge,TN 37831,USA [7]Computer Science and Mathematics Division,Oak Ridge National Laboratory,Oak Ridge,TN 37831,USA

出　　处：《npj Computational Materials》2020年第1期723-730,共8页计算材料学（英文）

基　　金：This research used resources of the Compute and Data Environment for Science(CADES)at the Oak Ridge National Laboratory,which is supported by the Office of Science of the U.S Department of Energy under Contract No.DE-AC05-00OR22725;This work was partially supported by the JSPSKAKENHI Grant Nos.15H04121,and 26220907(H.F.).

摘　　要：Spatially resolved time and voltage-dependent polarization dynamics in PbTiO3 thin films is explored using dynamic piezoresponse force microscopy(D-PFM)in conjunction with interferometric displacement sensing.This approach gives rise to 4D data sets containing information on bias-dependent relaxation dynamics at each spatial location without long-range electrostatic artifacts.To interpret these data sets in the absence of defined physical models,we employ a non-negative tensor factorization method which clearly presents the data as a product of simple behaviors allowing for direct physics interpretation.Correspondingly,we perform phase-field modeling finding the existence of‘hard’and‘soft’domain wall edges.This approach can be extended to other multidimensional spectroscopies for which even exploratory data analysis leads to unsatisfactory results due to many components in the decomposition.

关 键 词：RELAXATION FACTORIZATION DYNAMIC 

分 类 号：O17[理学—数学]