Control of Strain Through Thickness in Epitaxial Films Via Vertical Nanocomposite Heteroepitaxy
AssigneeLos Alamos National Security, LLC
InventorsJudith L. Driscoll, Quanxi Jia, Patrick Zerrer
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Abstract
A two-dimensional vertical heteroepitaxial strain controlled composite is grown. The strain-controlling phase can be benign in all other respects so that the functional properties of the parent phase are unchanged, improved/enhanced, and/or manipulated. The new composite is advantageous because there is no need for expensive specialized crystals and because there are no thickness limitations.
Claims20
A two-dimensional vertical heteroepitaxial strain controlled composite that is at least 10 nanometers thick and is characterized as having a checkerboard surface, comprising (1) a substrate and (2) a self-assembled layer comprising a material X and a material Y thereon wherein
- said material X and said material Y are each immiscible metal containing materials, and
- a molar ratio of said material X to said material Y ranges from about 2:3 to 3:2.
A two-dimensional vertical heteroepitaxial strain controlled composite that is at least 10 nanometers thick and is characterized as having an interspersed columnar structure, comprising (1) a substrate and (2) a layer comprising a material X and a material Y thereon wherein
- said material X and said material Y are immiscible metal containing materials, and
- a molar ratio of said material X to said material Y ranges from about 1:6 to about 6:1, with the proviso that said material X and said material Y are not (i) barium titanate and cobalt ferrite, or (ii) bismuth ferrite and cobalt ferrite.
A two-dimensional vertical heteroepitaxial strain controlled composite that is at least 10 nanometers thick and is characterized as having an interspersed columnar structure, comprising:
- (1) a substrate and (2) a layer comprising material X and a material Y thereon wherein
- said material X and said material Y are immiscible metal containing materials,
- a molar ratio of said material X to said material Y ranges from about 1:6 to 6:1, and
- said material X and said material Y are independently selected from perovskite type materials, rare earth oxide type materials, hexagonal structured metal oxide type materials, fluorite structured metal oxide type materials, rock salt structured metal oxide type materials, pyrochlore structured metal oxide type materials, spinel structured metal oxide type materials, a single metal element, and binary non-oxide compounds.
Dependencies are inferred from the claim text.