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Title: 2D Material(Graphene)-Perovskite(LSMO)Hybrid
Authors: Sonu
Keywords: Nanoscience & Technology
Issue Date: 2016
Series/Report no.: DI-111;
Abstract: Lanthanum strontium manganite (LSMO) with the general formula Lai-xSrxMnO3, is an oxide ceramic material having a perovskite crystal structure. With a Strontium substitution of x ~ 0.3, this material behaves like a half-metallic ferromagnet at room temperature with extremely large spin polarization values and a Tc well above 350 K. This half-metallic nature of La1-xSrxMnO3 has gained recent attention in the field of spintronics due to its potential in replacing the conventional ferromagnets (e.g. Co, Fe, NiFe) in practical device applications like GMR based read heads in computer hard drives. On the other hand, graphene the 2D allotrope of Carbon with ultra-high mo¬bility (~ 200,000 cm2/Vs) has been shown to be an excellent medium for applications at room temperature. Thus, an integration of graphene to La1-xSrxMnO3 would pos¬sibly be expected to provide a merger of the best of the two fields of perovskites and 2D materials. In this thesis, a first attempt towards understanding the properties of La1-xSrxMnO3/Graphene hybrid has been made. Here, we study the effect of graphene nanopowder on the electrical properties of La1-xSrxMnO3. Towards this, we have first characterized the La1-xSrxMnO3 samples prepared by solid state route as well as by sol-gel method which was then followed by the characterization of the La1-xSrxMnO3/ Graphene hybrid. Our initial results shows that unlike pure LSMO samples, the I-V characteristics of the LSMO/ Graphene hybrid samples have characteristics of a resis¬tive switching behaviour and points towards possible development of future resistive switching devices.
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