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Title: Controlled mechnaical modification of manganite surface with nanoscale resolution

Journal Article · · Nanotechnology
 [1];  [2];  [3];  [3];  [2];  [2];  [4];  [4];  [5];  [6];  [6];  [6];  [7];  [6];  [2];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Leiden Univ. (Netherlands)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  3. National Academy of Science of Ukraine, Kiev (Ukraine)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  5. Leiden Univ. (Netherlands)
  6. Konkuk University, Seoul (Korea)
  7. Sejong University, Seoul (Korea)

In this study, we investigated the surfaces of magnetoresistive manganites, La1-xCaxMnO3 and La2-2xSr1+2xMn2O7, using a combination of ultrahigh vacuum conductive, electrostatic and magnetic force microscopy methods. Scanning as-grown film with a metal tip, even with zero applied bias, was found to modify the surface electronic properties such that in subsequent scans, the conductivity is reduced below the noise level of conductive probe microscopy. Scanned areas also reveal a reduced contact potential difference relative to the pristine surface by ~0.3 eV. Finally, we propose that contact-pressure of the tip modifies the electrochemical potential of oxygen vacancies via the Vegard effect, causing vacancy motion and concomitant changes of the electronic properties.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265337
Journal Information:
Nanotechnology, Journal Name: Nanotechnology Journal Issue: 47 Vol. 25; ISSN 0957-4484
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Nanoscale mechanical control of surface electrical properties of manganite films with magnetic nanoparticles journal January 2019
Dynamic mechanical control of local vacancies in NiO thin films journal May 2018
Big data and deep data in scanning and electron microscopies: deriving functionality from multidimensional data sets journal May 2015

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