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Order improvement of surface nanopatterns via substrate rocking under ion bombardment: Experiments and nonlinear models

Authors
Jo, SujinJun, JiheeLee, EunsuYoon, S.M.Seo, J.Muñoz-García, J.Cuerno, R.Kim, Jae Sung
Issue Date
Jul-2020
Publisher
American Physical Society
Citation
Physical Review B, v.102, no.4, pp 1 - 14
Pages
14
Journal Title
Physical Review B
Volume
102
Number
4
Start Page
1
End Page
14
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/1353
DOI
10.1103/PhysRevB.102.045421
ISSN
2469-9950
2469-9969
Abstract
Surface nanopatterns formed by ion beam sputtering (IBS) frequently include a high density of structural defects, which seriously limit their practical applications. Recent theoretical work [M. P. Harrison and R. M. Bradley, Phys. Rev. E 93, 040802(R) (2016)10.1103/PhysRevE.93.040802], based on the anisotropic Kuramoto-Sivashinsky (aKS) equation, proposes that rocking a substrate during IBS can produce defect-free patterns under certain requirements. We find experimentally, via low-energy Kr+ irradiation of Si and amorphous carbon targets, that rocking the substrates generally improves the order of the ripple patterns. Indeed, order is improved even when conditions required in the aKS model may not be satisfied. Through numerical simulations, we show that a suitable generalization of this equation, in which conserved nonlinear effects are incorporated, reproduces satisfactorily the pattern order in our experimental conditions. © 2020 American Physical Society.
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첨단소재·전자융합공학부 (신소재물리전공)
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