Strain-induced ferromagnetism in LaCoO3: Theory and growth on Si (1 0 0)

A. Posadas; M. Berg; H. Seo; David Smith; A. P. Kirk; D. Zhernokletov; R. M. Wallace; A. De Lozanne; A. A. Demkov

doi:10.1016/j.mee.2011.03.108

Strain-induced ferromagnetism in LaCoO₃: Theory and growth on Si (1 0 0)

A. Posadas, M. Berg, H. Seo, David Smith, A. P. Kirk, D. Zhernokletov, R. M. Wallace, A. De Lozanne, A. A. Demkov

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

16 Scopus citations

Abstract

We have grown epitaxial ferromagnetic LaCoO₃ on (1 0 0)-oriented silicon. The films are grown by molecular beam epitaxy using a relaxed epitaxial SrTiO₃ buffer layer. X-ray diffraction measurements show a tetragonal LaCoO₃ film that is strained to the SrTiO₃ buffer layer. XPS measurements are consistent with reported spectra for single crystal, powder, and thin film LaCoO₃. Density functional calculations of strained LaCoO₃ confirms that the formation of the ferromagnetic state is accompanied by a partial opening of the Co-O-Co bond angle along the c-axis and a reduction in the local symmetry of the CoO ₆ octahedra from tetragonal to orthorhombic.

Original language	English (US)
Pages (from-to)	1444-1447
Number of pages	4
Journal	Microelectronic Engineering
Volume	88
Issue number	7
DOIs	https://doi.org/10.1016/j.mee.2011.03.108
State	Published - Jul 2011

Keywords

Cobaltates
Density functional
Ferromagnetism
Molecular beam epitaxy
Silicon
Strain

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Surfaces, Coatings and Films
Electrical and Electronic Engineering

Access to Document

10.1016/j.mee.2011.03.108

Cite this

@article{63aaae615ff14792a1eb0c1eddfec87b,

title = "Strain-induced ferromagnetism in LaCoO3: Theory and growth on Si (1 0 0)",

abstract = "We have grown epitaxial ferromagnetic LaCoO3 on (1 0 0)-oriented silicon. The films are grown by molecular beam epitaxy using a relaxed epitaxial SrTiO3 buffer layer. X-ray diffraction measurements show a tetragonal LaCoO3 film that is strained to the SrTiO3 buffer layer. XPS measurements are consistent with reported spectra for single crystal, powder, and thin film LaCoO3. Density functional calculations of strained LaCoO3 confirms that the formation of the ferromagnetic state is accompanied by a partial opening of the Co-O-Co bond angle along the c-axis and a reduction in the local symmetry of the CoO 6 octahedra from tetragonal to orthorhombic.",

keywords = "Cobaltates, Density functional, Ferromagnetism, Molecular beam epitaxy, Silicon, Strain",

author = "A. Posadas and M. Berg and H. Seo and David Smith and Kirk, {A. P.} and D. Zhernokletov and Wallace, {R. M.} and {De Lozanne}, A. and Demkov, {A. A.}",

note = "Funding Information: The authors thank Miri Choi and Rytis Dargis for assistance with sample growth. The authors also acknowledge John Markert for allowing the use of his SQUID magnetometer, Hugo Celio for additional XPS measurements, and Jamal Ramdani for providing epi-grade silicon wafers. This work is supported by the Office of Naval Research (ONR) under Grant N000 14-09-1-0908 , the National Science Foundation (NSF) under Grant DMR-0548182 , the US Department of Energy (DOE) under Grant DE-SC0001878 , and the Texas Advanced Computing Center. The authors also thank the NSF (Grant No. 0618242) for funding the X-ray photoelectron spectrometer used in this work. A.dL. acknowledges funding support from NSF Grants DGE-0549417 and DMR-0810119. R.M.W. acknowledges funding support from ONR under Grant N000 14-09-1-0909 and NSF under Grant ECCS-0925844.",

year = "2011",

month = jul,

doi = "10.1016/j.mee.2011.03.108",

language = "English (US)",

volume = "88",

pages = "1444--1447",

journal = "Microelectronic Engineering",

issn = "0167-9317",

publisher = "Elsevier",

number = "7",

}

TY - JOUR

T1 - Strain-induced ferromagnetism in LaCoO3

T2 - Theory and growth on Si (1 0 0)

AU - Posadas, A.

AU - Berg, M.

AU - Seo, H.

AU - Smith, David

AU - Kirk, A. P.

AU - Zhernokletov, D.

AU - Wallace, R. M.

AU - De Lozanne, A.

AU - Demkov, A. A.

N1 - Funding Information: The authors thank Miri Choi and Rytis Dargis for assistance with sample growth. The authors also acknowledge John Markert for allowing the use of his SQUID magnetometer, Hugo Celio for additional XPS measurements, and Jamal Ramdani for providing epi-grade silicon wafers. This work is supported by the Office of Naval Research (ONR) under Grant N000 14-09-1-0908 , the National Science Foundation (NSF) under Grant DMR-0548182 , the US Department of Energy (DOE) under Grant DE-SC0001878 , and the Texas Advanced Computing Center. The authors also thank the NSF (Grant No. 0618242) for funding the X-ray photoelectron spectrometer used in this work. A.dL. acknowledges funding support from NSF Grants DGE-0549417 and DMR-0810119. R.M.W. acknowledges funding support from ONR under Grant N000 14-09-1-0909 and NSF under Grant ECCS-0925844.

PY - 2011/7

Y1 - 2011/7

N2 - We have grown epitaxial ferromagnetic LaCoO3 on (1 0 0)-oriented silicon. The films are grown by molecular beam epitaxy using a relaxed epitaxial SrTiO3 buffer layer. X-ray diffraction measurements show a tetragonal LaCoO3 film that is strained to the SrTiO3 buffer layer. XPS measurements are consistent with reported spectra for single crystal, powder, and thin film LaCoO3. Density functional calculations of strained LaCoO3 confirms that the formation of the ferromagnetic state is accompanied by a partial opening of the Co-O-Co bond angle along the c-axis and a reduction in the local symmetry of the CoO 6 octahedra from tetragonal to orthorhombic.

AB - We have grown epitaxial ferromagnetic LaCoO3 on (1 0 0)-oriented silicon. The films are grown by molecular beam epitaxy using a relaxed epitaxial SrTiO3 buffer layer. X-ray diffraction measurements show a tetragonal LaCoO3 film that is strained to the SrTiO3 buffer layer. XPS measurements are consistent with reported spectra for single crystal, powder, and thin film LaCoO3. Density functional calculations of strained LaCoO3 confirms that the formation of the ferromagnetic state is accompanied by a partial opening of the Co-O-Co bond angle along the c-axis and a reduction in the local symmetry of the CoO 6 octahedra from tetragonal to orthorhombic.

KW - Cobaltates

KW - Density functional

KW - Ferromagnetism

KW - Molecular beam epitaxy

KW - Silicon

KW - Strain

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