相关实验视频

Updated: Jun 27, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

超快的光学诱导扰乱氧的八面体旋转在多铁的BiFeO₃薄膜

Ni Li¹, Hyeon Jun Lee^1,2, Deepankar Sri Gyan¹

¹Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

|May 6, 2024

概括

超快的光学刺激扭曲了多铁石铁矿 (BiFeO3) 中的氧八面体旋转模式. 这一发现使得对材料的精确控制成为可能.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
固态化学固态化学

背景情况:

复杂氧化物的功能性质取决于结构扭曲.
超快的光学激发可以对材料结构提供精确的控制.

研究的目的:

研究超快光学刺激对多铁基BiFeO3.3的结构动态的影响.
建立格子扩张和氧八面体旋转 (OOR) 模式之间的联系.
探索复杂氧化物中功能性质的超快速控制.

主要方法:

时间分辨率的X射线自由电子激光 (XFEL) 衍射与秒分辨率.
超快速的光学刺激.
密度函数理论 (DFT) 的计算.

主要成果:

在BioFeO3.3中,波段间隙以上的光学刺激诱导了网格扩张.
这种扩张导致了氧八面体旋转 (OOR) 模式的扭曲.
实验结果显示了OOR和菌株之间的连续合,与DFT预测一致.

结论:

超快的光学刺激可以精确地操纵OOR模式在多铁的BiFeO3.
这为控制复杂氧化物中的铁电和磁性提供了一条途径.
证明的方法适用于更广泛的材料.

关键词:

密度函数理论计算密度函数理论计算自由电子激光衍射的自由电子激光.多种铁路的多种铁路氧化物电子材料电子材料氧气八面体旋转的旋转超快的结构动力学.

更多相关视频

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Published on: March 27, 2018

相关概念视频

Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...