Microscopic evidence of a strain-enhanced ferromagnetic state in LaCoO 3 thin films

S. Park; P. Ryan; E. Karapetrova; J. W. Kim; J. X. Ma; J. Shi; J. W. Freeland; Weida Wu

doi:10.1063/1.3206667

Microscopic evidence of a strain-enhanced ferromagnetic state in LaCoO ₃ thin films

S. Park, P. Ryan, E. Karapetrova, J. W. Kim, J. X. Ma, J. Shi, J. W. Freeland, Weida Wu

School of Arts and Sciences, Physics & Astronomy

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

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.

Original language	English (US)
Article number	072508
Journal	Applied Physics Letters
Volume	95
Issue number	7
DOIs	https://doi.org/10.1063/1.3206667
State	Published - 2009

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3206667

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@article{413cff72d7f74d4ebe8df6d17343d66c,

title = "Microscopic evidence of a strain-enhanced ferromagnetic state in LaCoO 3 thin films",

abstract = "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.",

author = "S. Park and P. Ryan and E. Karapetrova and Kim, {J. W.} and Ma, {J. X.} and J. Shi and Freeland, {J. W.} and Weida Wu",

note = "Funding Information: Work at Rutgers is supported by NSF Grant No. DMR-0844807. Work at Argonne, including the Advanced Photon Source and Center for Nanoscale Materials, is supported by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. J.X.M. and J.S. at UCR are supported by ONR/DMEA under Award No. H94003-08-2-0803.",

year = "2009",

doi = "10.1063/1.3206667",

language = "English (US)",

volume = "95",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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T1 - Microscopic evidence of a strain-enhanced ferromagnetic state in LaCoO 3 thin films

AU - Park, S.

AU - Ryan, P.

AU - Karapetrova, E.

AU - Kim, J. W.

AU - Ma, J. X.

AU - Shi, J.

AU - Freeland, J. W.

AU - Wu, Weida

N1 - Funding Information: Work at Rutgers is supported by NSF Grant No. DMR-0844807. Work at Argonne, including the Advanced Photon Source and Center for Nanoscale Materials, is supported by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. J.X.M. and J.S. at UCR are supported by ONR/DMEA under Award No. H94003-08-2-0803.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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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DO - 10.1063/1.3206667

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 7

M1 - 072508

ER -

Microscopic evidence of a strain-enhanced ferromagnetic state in LaCoO ₃ thin films

Abstract

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