Quasi‐Two‐Dimensional Ferromagnetic SrRuO3 Grown by Pulsed Laser Deposition with Layer‐by‐Layer Growth Fashion
Quasi‐Two‐Dimensional Ferromagnetic SrRuO3 Grown by Pulsed Laser Deposition with Layer‐by‐Layer Growth Fashion
复制标题
DOI：
10.1002/admi.202201371
复制
发表时间：
2022-09
影响因子：
5.4
通讯作者：
Zhixiong Deng;Junhua Liu;Yuhao Hong;Long Wei;Shilin Hu;Wen Xiao;Lin Li;Lingfei Wang;
中科院分区：
文献类型：
--
作者：
Zhixiong Deng;Junhua Liu;Yuhao Hong;Long Wei;Shilin Hu;Wen Xiao;Lin Li;Lingfei Wang;
构建金属氧化物异质结构的关键之一是短的特征长度尺度，这需要在原子水平上控制生长和界面工程。目前，在TiO2端端（001）SrTiO3 （STO）衬底上生长的SrRuO3 （SRO）薄膜的生长模式通常在最初的几个生长阶段从二维逐层过渡到阶梯流动，这不利于形成超晶格或多层薄膜。本文通过调节生长条件，证明了SRO薄膜的持续逐层生长。因此，厚度可以精确地控制到单个单元格（u.c），并实现超晶格的精确调节。有趣的是，SRO/STO超晶格的物理性质与传统的阶跃流动模式相当，死层的临界厚度（tc）仅为3u.c。通过构建SRO/STO超晶格，SRO层变得更导电，并实现了准二维铁磁单层膜。研究结果为SRO异质结构的合成和在原子尺度上的性能控制铺平了道路。
One of the keys to the construction of metal oxide heterostructures is the short characteristic length scale, which requires controlled growth and interface engineering on an atomic level. At present, the growth mode of SrRuO3 (SRO) thin films grown on TiO2‐terminated (001) SrTiO3 (STO) substrates usually transitions from 2D layer‐by‐layer to step‐flow at the first few growth periods, which is not conducive to the construction of superlattices or multilayer films. In this paper, persistent layer‐by‐layer growth of SRO thin films is demonstrated by regulating the growth conditions. As a result, the thickness can be precisely controlled down to a single unit cell (u.c.) and achieve precise regulation of superlattices. Interestingly, the physical properties are well comparable to that of traditional step‐flow mode and the critical thickness (tc) for the dead layer is only 3 u.c. Through constructing SRO/STO superlattices, the SRO layers become more conductive and a quasi‐2D ferromagnetic monolayer film is achieved. The results pave a path toward SRO heterostructure synthesis and properties control at an atomic scale.