Premium
Substrate damage and incorporation of sapphire into barium hexaferrite films deposited by aerosol deposition
Author(s) -
Ranjit Smriti,
Law Ka Ming,
Budhathoki Sujan,
Allred Jared M.,
Rosenberg Richard A.,
Park DongSoo,
Johnson Scooter,
Hauser Adam J.
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16864
Subject(s) - materials science , crystallite , substrate (aquarium) , indentation , sapphire , barium , composite material , analytical chemistry (journal) , deposition (geology) , mineralogy , optics , chemistry , metallurgy , laser , paleontology , oceanography , physics , sediment , geology , chromatography , biology
Barium Hexaferrite (BaM) grown on sapphire substrate by aerosol deposition is investigated in a subtractive wedge series to determine the extent of energetic substrate damage and indentation. Energy dispersive x‐ray spectroscopy (EDS) mapping reveals Al 2 O 3 particulates ejected from the substrate surface during growth. The concentration of particles is higher at the substrate‐film interface but persists throughout the 6 µm thick film. An estimate of the indentation depth (~600 nm) was agreed upon using two EDS techniques (line scan analysis and substrate surface reconstruction by areal integration). X‐ray diffraction patterns show peak polycrystalline Al 2 O 3 intensity in 1.5 µm thick wedges and a decrease at higher thicknesses, confirming that Al 2 O 3 particulate density decreases further from the substrate. Magnetic characterization showed decreased magnetic moment compared to bulk and thickness dependence consistent with the fractional increase of Al 2 O 3 content in the films. X‐ray absorption at the Fe L 3 edge suggests a reduction of material close to the surface, but this reduction appears secondary in magnitude to the effect of damage from deposition.