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Title: Highly insulating ferromagnetic cobaltite heterostructures

Ferromagnetic insulators are rather rare but possess great technological potential in, for example, spintronics. Individual control of ferromagnetic properties and electronic transport provides a useful design concept of multifunctional oxide heterostructures. We studied the close correlation among the magnetism, atomic structure, and electronic structure of oxide heterostructures composed of the ferromagnetic perovskite LaCoO 3 and the antiferromagnetic brownmillerite SrCoO 2.5 epitaxial thin film layers. By reversing the stacking sequence of the two layers, we could individually modify the electric resistance and saturation magnetic moment. Lastly, the ferromagnetic insulating behavior in the heterostructures was understood in terms of the electronic reconstruction at the oxide surface/interfaces and crystalline quality of the constituent layers.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4]
  1. Sungkyunkwan Univ., Suwon (South Korea); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Sungkyunkwan Univ., Suwon (South Korea)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pusan National Univ., Busan (South Korea)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Current Applied Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 5; Journal ID: ISSN 1567-1739
Publisher:
Korean Physical Society
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; transition metal oxide; cobaltite; epitaxial heterostructre; magnetism; ferromagnetic insulator
OSTI Identifier:
1351778
Alternate Identifier(s):
OSTI ID: 1415493