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首页> 外文期刊>Physica, B. Condensed Matter >Substrate-dependent structural and magnetic properties of Sr _2FeMoO_6 nanostructured double perovskite thin films
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Substrate-dependent structural and magnetic properties of Sr _2FeMoO_6 nanostructured double perovskite thin films

机译：Sr _2FeMoO_6纳米结构双钙钛矿薄膜的基底依赖性结构和磁性

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摘要

We report the synthesis of nanostructured Sr_2FeMoO_6 (SFMO) thin films on SrTiO_3 (0 0 1), LaAlO_3 (0 0 1) and MgO (0 0 1) substrates by pulsed laser deposition technique. The influence of substrate nature on structural and magnetic properties of thin films has been systematically investigated. The films deposited on SrTiO_3 and LaAlO_3 were single crystalline with preferred (0 0 4) orientation without any impurity peak, whereas the films deposited on MgO substrate exhibit impurity peaks of SrFeO_3 along with (0 0 4) reflection of SFMO. The out of plane lattice parameter, 'c' and grain size have been shown to be influenced by nature of substrate. Further, the magnetic properties of the films, including the coercive field, remnant magnetization, saturation magnetization and magnetoresistance were also observed to be strongly dependent on the choice of substrate. The investigations reveal an increase in magnetization with decrease in filmsubstrate lattice mismatch. The films on SrTiO_3 substrate exhibit a saturation magnetic moment of 3.24μ_B/f.u. at 5 K, with a Curie temperature larger than 320 K, whereas the films deposited on MgO substrate are observed to have low magnetization, which is related to the high proportion of antisite defects in these films. The magnitude of MR was observed to be smaller in case of films deposited on SrTiO_3 substrate and in addition the variation in MR with applied field was found to be linear in these films, whereas the films on MgO substrate were found to exhibit higher value of MR with two different regimes: the low-field region (H<20 kOe) with a steeper slope and the high-field behavior with a less pronounced slope. The present study elucidates the effects of substrate nature on magnetization and that the magnetoresistance behavior of SFMO thin films are useful in magnetic sensors and spintronics application.
机译：我们报告了通过脉冲激光沉积技术在SrTiO_3（0 0 1），LaAlO_3（0 0 1）和MgO（0 0 1）衬底上合成纳米结构Sr_2FeMoO_6（SFMO）薄膜。已经系统地研究了衬底性质对薄膜的结构和磁性的影响。沉积在SrTiO_3和LaAlO_3上的膜是单晶，具有优选的（0 0 4）取向，没有任何杂质峰，而沉积在MgO衬底上的膜显示SrFeO_3的杂质峰以及SFMO的（0 0 4）反射。平面外晶格参数“ c”和晶粒尺寸已显示受基材性质的影响。此外，还观察到膜的磁性能，包括矫顽场，剩余磁化强度，饱和磁化强度和磁阻，都强烈依赖于衬底的选择。研究表明，磁化强度随薄膜基板晶格失配的减少而增加。 SrTiO_3衬底上的薄膜表现出3.24μB/ f.u的饱和磁矩。在5 K下，居里温度大于320 K，而在MgO衬底上沉积的薄膜磁化强度低，这与这些薄膜中反位缺陷的比例高有关。观察到在SrTiO_3衬底上沉积薄膜时MR的大小较小，此外，发现这些薄膜中MR随施加场的变化呈线性，而在MgO衬底上的薄膜表现出更高的MR值具有两种不同的模式：斜率较高的低场区域（H <20 kOe）和斜率不太明显的高场行为。本研究阐明了衬底性质对磁化的影响，以及SFMO薄膜的磁阻行为可用于磁传感器和自旋电子学。

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