Preferential growth of perovskite BaTiO3 thin films on Gd3Ga5O12(100) and Y3Fe5O12(100) oriented substrates by pulsed laser deposition

Yttrium iron garnet (YIG) and barium titanate (BTO) were co-deposited on (001)-orientated gadolinium gallium garnet substrates by pulsed laser deposition with composition determined by the ratio of laser shots ablating each target. With increasing shot ratios of YIG/BTO = 2.5/1, 4/1, 20/1, and 30/1, the majority phase in the film changes from textured polycrystalline perovskite to epitaxial garnet. Cross-sectional STEM characterization of the YIG-rich films reveals three distinct sublayers: the bottom layer is a coherent epitaxial garnet layer with higher unit cell volume than that of YIG; the second layer is garnet exhibiting crystalline defects and misorientation; and the upper layer is amorphous. Highly defective regions within the second layer are richer in Ba, suggesting that the microstructure is promoted by the insolubility of Ba in YIG. Temperature-dependent magnetization measurements fitted to a super-exchange dilution model indicate the presence of nonmagnetic Ti and vacancies in both octahedral and tetrahedral sites.

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Preferential growth of perovskite BaTiO₃ thin films on Gd₃Ga₅O₁₂(100) and Y₃Fe₅O₁₂(100) oriented substrates by pulsed laser deposition

Abstract: This work is concerned with the structural compatibility of perovskite BaTiO3 on garnet substrates Gd3Ga5O12 and Y3Fe5O12. Thin films (200 and 500 nm nominal thickness) have been deposited by pulsed...

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References 50 publications

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Magnetism and microstructure of co-deposited yttrium iron garnet-barium titanate films

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