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首页> 外文期刊>Applied Surface Science >Substrate effect on the structural phase formation and magnetic properties of α-Fe_2O_3 and Ti doped α-Fe_2O_3 thin films
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Substrate effect on the structural phase formation and magnetic properties of α-Fe_2O_3 and Ti doped α-Fe_2O_3 thin films

机译：衬底对α-Fe_2O_3和Ti掺杂α-Fe_2O_3薄膜的结构相形成和磁性能的影响

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摘要

We report the synthesis and magnetic properties of hematite (alpha-Fe2O3) and Ti doped hematite (alpha-Fe1.4Ti0.6O3) films. The films have been grown at 400 degrees C on different substrates by using Pulsed Laser Deposition technique. The as-grown film has been heated in the temperature range 600-730 degrees C either in air or vacuum. Microstructure of the films has been studied using X-ray diffraction pattern, Atomic force microscope, Field effect Scanning Electron Microscope, and magneto-optic Kerr effect (MOKE). Crystalline structure of the films has been stabilized either in rhombohedral phase or in cubic spinel phase depending on the type of substrates. The crystalline films have been found highly oriented on specific directions. Magnetic order of the films at room temperature has been studied using MOKE. The films on selected substrates have been used for a detailed study of low temperature magnetic properties. The temperature dependent magnetization of the films has exhibited bifurcation between zero field cooled and field cooled magnetic curves at all measurement temperatures (5-350 K). Magnetic spin order of the films has been affected by the nature of substrates. Some of the films with room temperature ferromagnetism or canted antiferromagnetism seem to be useful for spintronics applications.
机译：我们报告了赤铁矿（α-Fe2O3）和掺钛的赤铁矿（α-Fe1.4Ti0.6O3）薄膜的合成和磁性。通过使用脉冲激光沉积技术，薄膜已在400摄氏度的不同基板上生长。所生长的薄膜已在空气或真空中在600-730摄氏度的温度范围内加热。使用X射线衍射图，原子力显微镜，场效应扫描电子显微镜和磁光克尔效应（MOKE）对薄膜的微观结构进行了研究。膜的晶体结构已在菱面体相或立方尖晶石相中稳定，具体取决于基材的类型。已经发现结晶膜在特定方向上高度取向。使用MOKE研究了室温下薄膜的磁性顺序。所选基材上的薄膜已用于详细研究低温磁性能。薄膜的温度相关磁化强度在所有测量温度（5-350 K）下均表现为零磁场冷却和磁场冷却的磁曲线之间的分叉。薄膜的磁性自旋顺序已受基材性质的影响。某些具有室温铁磁性或倾斜反铁磁性的薄膜似乎可用于自旋电子学。

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