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首页> 外文期刊>Journal of magnetism and magnetic materials >Evidence of two dimensional dilute antiferromagnet mediated exchange bias field and vertical shift in LaFeO~3-NiO nanocomposite
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Evidence of two dimensional dilute antiferromagnet mediated exchange bias field and vertical shift in LaFeO~3-NiO nanocomposite

机译：二维稀释反菌介导的交换偏置场和Lafeo〜3-nio纳米复合材料的垂直偏移的证据

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Low dimensional antiferromagnetic systems, such as nanoparticles, are known to exhibit weak ferromagnetic behavior due to the uncompensated surface spins.In this report, we present a detailed magnetic study of LaFeO_3/ NiO nanocomposite, synthesized by propylene glycol gel method.The X-ray diffraction (XRD) based analyses, in combination with transmission electron microscopy (TEM), confirms 50∶50 ratio composite with ～35-40 nm size particles.Owing to the high Neel temperatures (T_N) of LaFeO_3 and NiO, significant exchange bias (EB) and vertical magnetization shift (VMS) have been observed in the nanocomposite at room temperature.These features are attributed to the exchange interaction at the interface between the core and shell of the nanoparticles that are homogeneously dispersed in the nanocomposite.In our studies, the EB field and the VMS attains a value as high as 2050 Oe & 1.8 × 10~(-1) emu/g at 5 K and 75 Oe & 1.7 × 10~(-2) emu/g at 300 K, respectively.The thermoremanent magnetization (TRM) and isothermoremanent magnetization (IRM) analyses are done to identify the two-dimensional (2D) diluted antiferromagnet (DAFF) behavior of the surface shell of nanoparticles.We propose a phenomenological antiferromagnetic-(2D-DAFF)-antiferromagnetic magnetic structure model, to explain all the rich features and the observed magnetic properties of this nanocomposite.
机译：已知低尺寸反铁磁性系统，例如纳米颗粒，由于未补偿的表面旋转，纳米颗粒具有弱铁磁性行为。本报告中，我们介绍了Lafeo_3 / NiO纳米复合材料的详细磁性研究，由丙二醇凝胶法合成。X射线基于衍射（XRD）的分析与透射电子显微镜（TEM）组合，用〜35-40nm尺寸的粒子确认50:50比复合材料。据Lafeo_3和NIO的高新莲温度（T_N），重大交换偏差（在室温下在室温下观察到EB）和垂直磁化移位（VM）。这些特征归因于在纳米复合材料均匀分散在纳米复合材料中的核心和壳体之间的界面之间的交换相互作用。在我们的研究中， EB字段和VMS分别以5 k和75°OE＆1.7×10〜（-2）emu / g为300 k，以高达2050 OE＆1.8×10〜（-1）emu / g的值。热度磁铁进行Ization（TRM）和等温度磁化（IRM）分析以鉴定纳米颗粒的表面壳的二维（2D）稀释的抗铁膜（DAFF）行为.WE提出了一种现象学反铁磁 - （2D-DAFF） - 鞍磁性结构模型，解释所有富含特征和该纳米复合材料的磁性。

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