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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Biphasic Fe-Rh nanowires synthesized by AC electrodeposition
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Biphasic Fe-Rh nanowires synthesized by AC electrodeposition

机译：交流电沉积法制备双相Fe-Rh纳米线

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摘要

Fe and Fe90Rh10 (nominal) polycrystalline nanowire arrays, 20 nm in diameter and about 1-3 mm in length, are successfully synthesized by AC electrodeposition into the cylindrical pores of anodized aluminum oxide (AAO) nanotemplates. The effects of Rh addition to Fe nanowires on the resulting microstructure, magnetic hysteresis and magnetoresistance properties are explored. As deposited Fe90Rh10 nanowires are biphasic, with large alpha - Fe grains (> 100 nm) and clusters of very small (1.7 nm) grains of the ClCs type alpha'-FeRh phase, with a composition near Fe42Rh58. Hysteresis loops as a function of the sample orientation relative to the external applied field indicate that the easy magnetization axis is parallel to the nanowire long axis at all temperatures. The coercive field decreases with rhodium addition, as expected for an effective uniaxial anisotropy controlled by shape effects; on contrary, the relative remanence (or squareness) slightly increases. The temperature dependence of the coercive field is consistent with a mechanism involving nucleation of inverse domains, with an apparent energy barrier at zero fields between 2.6 and 4.1 eV. Room temperature magnetoresistance in Fe90Rh10 arrays is negative and shows hysteresis at low fields. At low temperature a large hysteresis is observed for fields between the knees in the hysteresis loop, with field ranges of positive and negative magnetoresistance slopes, arising in domain wall nucleation and expansion to complete polarization reversal and in conventional anisotropic magnetoresistance, respectively. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过交流电沉积到阳极氧化铝（AAO）纳米模板的圆柱孔中，成功地合成了直径20 nm，长度约1-3 mm的Fe和Fe90Rh10（标称）多晶纳米线阵列。探索了将Rh添加到Fe纳米线上对所得的微观结构，磁滞和磁阻特性的影响。沉积的Fe90Rh10纳米线是两相的，具有大的α-Fe晶粒（> 100 nm）和非常小的（1.7 nm）ClCs型α'-FeRh相的晶粒簇，其组成接近Fe42Rh58。磁滞回线是样品相对于外部施加磁场的方向的函数，表明在所有温度下易磁化轴均与纳米线长轴平行。如通过形状效应控制的有效单轴各向异性所预期的那样，矫顽场随铑的加入而减小。相反，相对剩磁（或垂直度）略有增加。矫顽场的温度依赖性与涉及逆域成核的机制一致，在2.6和4.1 eV之间的零场处具有明显的能垒。 Fe90Rh10阵列中的室温磁阻为负，并且在低磁场下显示磁滞。在低温下，在磁滞回线的膝盖之间的磁场处观察到较大的磁滞，其正磁阻斜率和负磁阻斜率的磁场范围分别发生在畴壁成核和扩展以分别完成极化反转和常规各向异性磁阻中。 （C）2016 Elsevier B.V.保留所有权利。

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