Consequences of High Adatom Energy during Pulsed Laser Deposition of La0.7Sr0.3MnO3

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• 作者：Jos E. Boschker ; Erik Folven ; 脜smund F. Monsen ; Erik Wahlstr枚m ; Jostein K. Grepstad ; Thomas Tybell
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：February 1, 2012
• 年：2012
• 卷：12
• 期：2
• 页码：562-566
• 全文大小：258K
• 年卷期：v.12,no.2(February 1, 2012)
• ISSN：1528-7505

文摘

The impact of the adatom energy on the stoichiometry, surface morphology, and crystalline twinning during pulsed laser deposition of La_0.7Sr_0.3MnO₃ is studied. We show that although nonthermal growth using highly energetic adatoms results in very smooth ultrathin films, it also causes preferential resputtering of Mn and a surface roughening transition with increasing film thickness. This can be circumvented by carefully tuning the adatom energy into thermal growth, resulting in more Mn rich samples and a delayed roughening transition. Furthermore, we demonstrate that the crystalline twinning can be controlled by controlling the adatom energy. Hence, a detailed control of the adatom energy during growth opens for better stoichiometry control as well as surface quality.