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首页> 外文期刊>Journal of the Indian Chemical Society >Spin filter effect in iron oxide nanocrystal arrays
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Spin filter effect in iron oxide nanocrystal arrays

机译：氧化铁纳米晶体阵列中的自旋滤光效应

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摘要

Integrating nanocrystals (NCs) into magnetic tunnel structures is of considerable interest due to expectation of novel properties from their spin selective transport and single electron features. Superstructures by cplloidal NCs having translational and orientational order and interesting collective magnetic properties can be prepared by solution casting through sensitive interparticle and particle-substrate interactions. In this work, we discuss the study on magnetic field induced assembly of mono-dispersed iron oxide NCs to obtain spin filter effect across (he superlattice array, when sandwiched between gold electrodes. The deposition of mixed phase Fe3O4@gamma-Fe2O3 NCs on SiO2/Au surface proceeds through slow solvent evaporation and are studied for controlled interparticle spacing. For specific NC concentration, the ordering depends on the substrate chemistry and the ligands passivating NC surface, which affects the concentration of cluster nuclei formed. In presence of a magnetic field, the tunnel structure exhibits enhanced positive tunnel magnetoresistance at low temperatures, which could be related to their ferromagnetism and the attempts by electrons to percolate NC superlattice with preserved spin. A sign reversal for magnetoresistance is exhibited by the vertical tunnel junctions on raising the temperature.
机译：由于人们期望从其自旋选择性传输和单电子特征中获得新颖的特性，因此将纳米晶体（NCs）集成到磁性隧道结构中引起了极大的兴趣。可以通过通过敏感的颗粒间相互作用和颗粒-底物相互作用进行溶液浇铸来制备具有平移和取向顺序以及有趣的集体磁性的单倍体NCs的上层结构。在这项工作中，我们讨论了磁场诱导的单分散氧化铁NC组装的研究，以便获得超晶格阵列（夹在金电极之间时）的自旋滤波效果。混合相Fe3O4 @γ-Fe2O3NC在SiO2上的沉积/ Au表面通过缓慢的溶剂蒸发而进行，并研究了可控的粒子间距，对于特定的NC浓度，其顺序取决于底物化学性质和钝化NC表面的配体，这会影响所形成的簇核的浓度。 ，该隧道结构在低温下具有增强的正隧道磁阻，这可能与其铁磁性以及电子试图以自旋渗透渗入NC超晶格的尝试有关，而垂直隧道结在升高温度时显示出磁阻的符号反转。

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