High-quality antiferromagnetic EuTiO3 epitaxial thin films on SrTiO3 prepared by pulsed laser deposition and postannealing
High-quality antiferromagnetic EuTiO3 epitaxial thin films on SrTiO3 prepared by pulsed laser deposition and postannealing
复制标题
DOI：
10.1063/1.3072598
复制
发表时间：
2009-02-09
影响因子：
4
通讯作者：
Tanaka, Katsuhisa
中科院分区：
文献类型：
--
作者：
Fujita, Koji;Wakasugi, Naoki;Tanaka, Katsuhisa
本文报道了具有钙钛矿结构的EuTiO3薄膜的外延生长和磁性能。采用脉冲激光沉积法（PLD）在SrTiO3（001）表面生长出具有原子平面的EuTiO3单晶薄膜，并在还原气氛中退火。沉积膜具有细长的c轴晶体结构，在低温下具有稳定铁磁有序Eu2+自旋的倾向。1000℃后退火使面外晶格应变松弛，导致磁性结构发生剧烈变化；退火膜在5.1 K的尼尔温度下成为反铁磁体。讨论了随晶格常数变化而发生的磁性变化。
We report on epitaxial growth and magnetic properties of EuTiO3 thin films with a perovskite structure. Single crystalline EuTiO3 films with atomically flat surface are grown on (001) surface of SrTiO3 by pulsed laser deposition (PLD) and subsequent annealing in reducing atmosphere. The as-deposited films possess the crystal structure with an elongated c-axis and tend to stabilize ferromagnetically ordered Eu2+ spins at low temperatures. Postannealing at 1000 degrees C relaxes the out-of-plane lattice strain, and brings about a drastic change in magnetic structure; the annealed film becomes an antiferromagnet below Neel temperature of 5.1 K. The change in magnetic properties accompanied by the modification in lattice constant is discussed.