Magnetic compounds wtth perovskite structure III. ferromagnetic compounds of cobalt

Jonker, G.H.; Santen, J. H. van

doi:10.1016/s0031-8914(53)80011-x

Cited by 491 publications

(197 citation statements)

References 9 publications

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“…The resistivity of epitaxial La 0.5 Sr 0.5 CoO 3 films is 1.7Ϯ0.2ϫ10 Ϫ4 ⍀ cm, a value which is slightly lower than the reported literature value for bulk ceramics. 17 For the growth of La 0.5 Sr 0.5 CoO 3 films on Si subtrates ͑including native oxide͒, we observed a columnar microstructure with an average column diameter of 40 nm. For films deposited at 587°C, SIMS analysis indicates only a slight interdiffusion between La 0.5 Sr 0.5 CoO 3 and Si.…”

Section: Resultsmentioning

confidence: 89%

Thickness dependence of the switching voltage in all-oxide ferroelectric thin-film capacitors prepared by pulsed laser deposition

Cillessen¹,

Prins²,

Wolf³

1997

Journal of Applied Physics

163

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Thin-film ferroelectric capacitors consisting of PbZr 0.53 Ti 0.47 O 3 sandwiched between La 0.5 Sr 0.5 CoO 3 electrodes have been deposited using pulsed laser deposition. The combination of oxidic perovskite-type materials results in capacitors with a coercive field (E c ) which is comparable with values for bulk ceramics. Textured thin-film capacitors with a columnar microstructure show lower switching voltages than epitaxial films. No thickness dependence of E c and a good endurance up to 10 11 cycles have been observed for epitaxial as well as textured capacitors with oxidic electrodes. In contrast, capacitors with a metallic top electrode show an increase of E c with decreasing thickness of the ferroelectric layer. We show that charge injection can explain the experimentally observed increase of E c with decreasing ferroelectric layer thickness. An overview is given of the growth conditions needed for PbZr 0.53 Ti 0.47 O 3 films, because the precise stoichiometry is of the utmost importance for the capacitor quality.

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Section: Resultsmentioning

confidence: 89%

Thickness dependence of the switching voltage in all-oxide ferroelectric thin-film capacitors prepared by pulsed laser deposition

Cillessen¹,

Prins²,

Wolf³

1997

Journal of Applied Physics

163

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“…For STO(001)/LSCO and LAO(001)/LSCO, the (013) reflection was chosen. For STO(110)/LSCO, the fourfold in-plane symmetry is broken, and we chose the (310) and (222) reflections to probe two orthogonal high symmetry in-plane directions ( [1][2][3][4][5][6][7][8][9][10] and [001]). In all cases, white crosses mark the positions of the fully strained (pseudomorphic) and fully relaxed (bulk) LSCO reflections.…”

mentioning

confidence: 99%

Lattice mismatch accommodation via oxygen vacancy ordering in epitaxial La0.5Sr0.5CoO3-δ thin films

et al. 2013

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The properties of complex oxide films depend sensitively on epitaxial strain. This strain affects bond lengths and angles, and defect types and densities, thus impacting physical properties. In this work we perform detailed characterization of depth-dependent strain in epitaxial La0.5Sr0.5CoO3-δ (LSCO) films on SrTiO3(001), SrTiO3(110), and LaAlO3(001) substrates, combining high resolution x-ray diffraction and scanning transmission electron microscopy, in addition to geometric phase analysis. We elucidate a fundamental link between strain state and O vacancy ordering in LSCO films, where lattice mismatch and crystallographic orientation can be used to manipulate the modulation vector of the long-range vacancy order, thus providing a new approach to tailor the properties of such films.

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“…Initial theoretical studies on the nature of the transition in the doped system (La -Sr)CoO 3 were introduced in the 1960s. 1,2 Since then, there have been many experimental and theoretical studies investigating the spin behavior, but…”

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confidence: 99%

Ferromagnetism in tetragonally distorted LaCoO3 thin films

Mehta

Liberati

Wong

et al. 2009

Journal of Applied Physics

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Thin films of epitaxial LaCoO3 were synthesized on SrTiO3 and (La,Sr)(Al,Ta)O3 substrates, varying the oxygen background pressure in order to evaluate the impact of epitaxial growth as well as oxygen vacancies on the long range magnetic order. The epitaxial constraints from the substrate impose a tetragonal distortion compared to the bulk form. X-ray absorption and x-ray magnetic circular dichroism measurements confirmed that the ferromagnetism arises from the Co ions and persists through the entire thickness of the film. It was found that for the thin films to show ferromagnetic order they have to be grown under the higher oxygen pressures. A correlation of the structure and magnetism suggests that the tetragonal distortions induce the ferromagnetism.

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Magnetic compounds wtth perovskite structure III. ferromagnetic compounds of cobalt

Cited by 491 publications

References 9 publications

Thickness dependence of the switching voltage in all-oxide ferroelectric thin-film capacitors prepared by pulsed laser deposition

Thickness dependence of the switching voltage in all-oxide ferroelectric thin-film capacitors prepared by pulsed laser deposition

Lattice mismatch accommodation via oxygen vacancy ordering in epitaxial La0.5Sr0.5CoO3-δ thin films

Ferromagnetism in tetragonally distorted LaCoO3 thin films

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