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首页> 外文期刊>Journal of Materials Research >Structural, magnetic, and transport properties of pulsed-laser deposition La0.65Ca0.35MnO3 films grown under different substrate arrangements in the laser plume
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Structural, magnetic, and transport properties of pulsed-laser deposition La0.65Ca0.35MnO3 films grown under different substrate arrangements in the laser plume

机译：在激光羽流中不同衬底排列下生长的脉冲激光沉积La0.65Ca0.35MnO3膜的结构，磁性和传输性质

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摘要

The structural, transport, and magnetic properties of La0.65Ca0.35MnO3 films grown on MgO substrates by pulsed-laser deposition under different substrate arrangements in the laser plume were studied. In addition to the standard substrate arrangement in the main stream of particles, substrate arrangements in the periphery area of the laser plume and in an area shielded from the plume were used. In the latter case, the deposition occurs from the flux that is reflected from a side screen. It was found that the substrate arrangement influences considerably the surface topography, structure, chemical composition, magnetic, transport, and magnetoresistance properties of the films. It was found that the substrate arrangements in the periphery area of the laser plume and in the shielded area of the plume eliminate deposition of large particulates. The latter arrangement is the most effective in elimination of particulate deposition. In this case, the film has the smoothest surface with root mean square roughness of about 2 nm. The data obtained revealed interesting correlations between the structural and transport properties as well. In particular, films deposited in the periphery and shielded areas of the laser plume have increased nonstoichiometry (La deficiency), higher resistivity, and broader magnetic transitions. The polycrystalline nature of the films studied is taken into account in the discussion of their transport properties. [References: 21]
机译：研究了在激光羽流中不同衬底排列下通过脉冲激光沉积在MgO衬底上生长的La0.65Ca0.35MnO3薄膜的结构，传输和磁性。除了主流颗粒中的标准基板布置之外，还使用了激光羽流外围区域和屏蔽羽流的区域中的基板布置。在后一种情况下，沉积是由从侧屏反射的通量产生的。已经发现，基材的排列对薄膜的表面形貌，结构，化学组成，磁，输运和磁阻性能有很大影响。已经发现，在激光羽流的外围区域和羽流的屏蔽区域中的基板布置消除了大颗粒的沉积。后一种布置对于消除颗粒沉积是最有效的。在这种情况下，该膜具有最光滑的表面，均方根粗糙度约为2 nm。所获得的数据也揭示了结构和运输性质之间有趣的相关性。尤其是，沉积在激光羽流的外围和屏蔽区域中的薄膜具有更高的非化学计量比（La缺陷），更高的电阻率和更宽的磁跃迁。在讨论其传输特性时，考虑了所研究薄膜的多晶性质。 [参考：21]

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