Optically tunable magnetoresistance properties in La0.7Sr0.3MnO3-Glass nanocomposites: A step towards Optospintronics

IF 2.8 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Nitish Ghosh, Debajit Deb, P. Dey
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引用次数: 0

Abstract

Perovskite manganites are interesting materials in spintronic devices due to their significant magneto-transport properties. Here, magneto-transport study has been carried out on structurally characterized (100−x) % La0.7Sr0.3MnO3-x%Glass composites (x = 0(S1), 0.2(S2), 0.5(S3)). Our experiments provide evidences of largest MR (17%) for S2 sample, whereas 2% and 12% for S1 and S3 samples, respectively. Experimental MR vs H curves have been fitted employing a phenomenological model (Raychaudhuri et al. in J. Appl. Phys. 84:2048–2052, 1998) which indicates that it is the spin polarized tunnelling MR, which get modulated as a function of glass content. The surface spin susceptibility χb exhibits similar crossover behaviour with glass content in the composite. Such intriguing correlation of glass content dependence of χb and MRspt strongly suggest that χb i.e., the second order tunnelling across the interfacial region between adjacent LSMO grains governs SPT process and hence non-monotonic variation of MRspt with glass content. Optical tuning of SPTMR in the samples has also been investigated by 660 nm red laser light illumination. Non-monotonic photo-response exhibiting maximum photocurrent in S2 sample has been attributed to glass content ratio dependent exciton dissociation at interfacial region. Under illumination, decoherence and misalignment of surface spins seem to result in decrease in SPT magnetoresistance. Interfacial region of S2 sample has been found to be highly sensitive to optical illumination in which both χb and MRspt have been observed to switch their values from negative to positive ones. Large MRspt and switching of sign of MRspt with light illumination propose S2 nanocomposite as potential candidate for future Optospintronics applications.

La0.7Sr0.3MnO3-Glass纳米复合材料的光可调谐磁阻特性:迈向光自旋电子学的一步
钙钛矿锰矿由于其显著的磁输运特性而成为自旋电子器件中有趣的材料。本文对结构表征为(100−x) % La0.7Sr0.3MnO3-x%Glass (x = 0(S1), 0.2(S2), 0.5(S3))的复合材料进行了磁输运研究。我们的实验提供了S2样品最大MR(17%)的证据,而S1和S3样品分别为2%和12%。采用现象学模型(Raychaudhuri et al. in J. apple)拟合了实验MR与H曲线。物理学,84:2048-2052,1998),这表明它是自旋极化隧穿MR,它作为玻璃含量的函数被调制。表面自旋磁化率χb表现出与复合材料中玻璃含量相似的交叉行为。χb与MRspt之间这种有趣的相关性强烈表明,χb即,在相邻LSMO晶粒之间的界面区域上的二阶隧道作用控制着SPT过程,因此MRspt随玻璃含量的非单调变化。在660 nm的红色激光照射下,研究了样品中SPTMR的光学调谐。在S2样品中表现出最大光电流的非单调光响应归因于玻璃含量比相关的界面区激子解离。在光照条件下,表面自旋的退相干和错位似乎会导致SPT磁电阻的降低。S2样品的界面区域对光学光照非常敏感,其中χb和MRspt的值都由负向正转换。大MRspt和MRspt符号随光照的切换表明S2纳米复合材料是未来光自旋电子学应用的潜在候选材料。
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来源期刊
Journal of Materials Science: Materials in Electronics
Journal of Materials Science: Materials in Electronics 工程技术-材料科学:综合
CiteScore
5.00
自引率
7.10%
发文量
1931
审稿时长
2 months
期刊介绍: The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.
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