TY - JOUR
T1 - Crucible aperture
T2 - An effective way to reduce source oxidation in oxide molecular beam epitaxy process
AU - Kim, Yong Seung
AU - Bansal, Namrata
AU - Oh, Seongshik
N1 - Funding Information:
This work is supported by the IAMDN of Rutgers University, the National Science Foundation (NSF) (Grant No. DMR-0845464), and the Office of Naval Research (ONR) (Grant No. N000140910749).
PY - 2010/7
Y1 - 2010/7
N2 - Growing multielemental complex-oxide structures using a molecular beam epitaxy (MBE) technique requires precise control of each source flux. However, when the component elements have significantly different oxygen affinities, maintaining stable fluxes for easily oxidizing elements is challenging because of the source oxidation problem. Here, using Sr as a test source, the authors show that a crucible aperture insert scheme significantly reduces the source oxidation in an oxide-MBE environment. The crucible aperture insert was shaped like a disk with a hole at the center and was mounted inside the crucible; it blocks most of the oxygen species coming to the source, thus reducing the source oxidation. However, the depth of the aperture disk was critical for its performance; an ill-positioned aperture could make the flux stability even worse. With an optimally positioned aperture insert, the crucible exhibited more than four times improvement in Sr flux stability, compared to a conventional, nonapertured crucible.
AB - Growing multielemental complex-oxide structures using a molecular beam epitaxy (MBE) technique requires precise control of each source flux. However, when the component elements have significantly different oxygen affinities, maintaining stable fluxes for easily oxidizing elements is challenging because of the source oxidation problem. Here, using Sr as a test source, the authors show that a crucible aperture insert scheme significantly reduces the source oxidation in an oxide-MBE environment. The crucible aperture insert was shaped like a disk with a hole at the center and was mounted inside the crucible; it blocks most of the oxygen species coming to the source, thus reducing the source oxidation. However, the depth of the aperture disk was critical for its performance; an ill-positioned aperture could make the flux stability even worse. With an optimally positioned aperture insert, the crucible exhibited more than four times improvement in Sr flux stability, compared to a conventional, nonapertured crucible.
UR - http://www.scopus.com/inward/record.url?scp=77954209322&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77954209322&partnerID=8YFLogxK
U2 - 10.1116/1.3449051
DO - 10.1116/1.3449051
M3 - Article
AN - SCOPUS:77954209322
SN - 0734-2101
VL - 28
SP - 600
EP - 602
JO - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
JF - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
IS - 4
ER -