4.6 Article

Microscopic evidence of a strain-enhanced ferromagnetic state in LaCoO3 thin films

期刊

APPLIED PHYSICS LETTERS
卷 95, 期 7, 页码 -

出版社

AIP Publishing
DOI: 10.1063/1.3206667

关键词

ferromagnetic materials; lanthanum compounds; magnetic susceptibility; magnetic thin films; magnetisation

资金

  1. NSF [DMR-0844807]
  2. U. S. Department of Energy, Office of Science
  3. Office of Basic Energy Sciences [DE-AC02-06CH11357]
  4. ONR/DMEA [H94003-08-2-0803]
  5. Division Of Materials Research
  6. Direct For Mathematical & Physical Scien [0844807] Funding Source: National Science Foundation

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Strain-induced modification of magnetic properties of lightly hole doped epitaxial LaCoO3 thin films on different substrates were studied with variable temperature magnetic force microscopy (MFM). Real space observation at 10 K reveals the formation of the local magnetic clusters on a relaxed film grown on LaAlO3 (001). In contrast, a ferromagnetic ground state has been confirmed for tensile-strained film on SrTiO3 (001), indicating that strain is an important factor in creating the ferromagnetic state. Simultaneous atomic force microscopy and MFM measurements reveal nanoscale defect lines for the tensile-strained films, where the structural defects have a large impact on the local magnetic properties.

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