Sharma Yogesh, Skoropata Elizabeth, Paudel Binod, Kang Kyeong Tae, Yarotski Dmitry, Ward T Zac, Chen Aiping
Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
Nanomaterials (Basel). 2020 Oct 21;10(10):2085. doi: 10.3390/nano10102085.
We report on the growth of stoichiometric, single-crystal YCrO epitaxial thin films on (001) SrTiO substrates using pulsed laser deposition. X-ray diffraction and atomic force microscopy reveal that the films grew in a layer-by-layer fashion with excellent crystallinity and atomically smooth surfaces. Magnetization measurements demonstrate that the material is ferromagnetic below 144 K. The temperature dependence of dielectric permittivity shows a characteristic relaxor-ferroelectric behavior at = 375-408 K. A dielectric anomaly at the magnetic transition temperature indicates a close correlation between magnetic and electric order parameters in these multiferroic YCrO films. These findings provide guidance to synthesize rare-earth, chromite-based multifunctional heterostructures and build a foundation for future studies on the understanding of magnetoelectric effects in similar material systems.
我们报道了使用脉冲激光沉积法在（001）SrTiO衬底上生长化学计量比的单晶YCrO外延薄膜。X射线衍射和原子力显微镜表明，薄膜以逐层方式生长，具有优异的结晶度和原子级光滑的表面。磁化测量表明，该材料在144 K以下是铁磁性的。介电常数的温度依赖性在375 - 408 K时表现出典型的弛豫铁电行为。磁转变温度处的介电异常表明这些多铁性YCrO薄膜中磁序参量和电序参量之间存在密切关联。这些发现为合成稀土铬铁矿基多功能异质结构提供了指导，并为未来研究类似材料体系中的磁电效应奠定了基础。
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