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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 >Electrochemical syntheses of soft and hard magnetic FesoPdso-based nanotubes and their magnetic characterization
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Electrochemical syntheses of soft and hard magnetic FesoPdso-based nanotubes and their magnetic characterization

机译：软硬磁性FesoPdso基纳米管的电化学合成及其磁性表征

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摘要

Near-equiatomic Fe-Pd-based nanotubes with diameters of 200 nm and lengths of 1 μm were directly electrodeposited from a single electrolyte into polycarbonate templates. The as-deposited Fe_(50)Pd_(50) nanotubes were then characterized compositionally, structurally and magnetically. The as-deposited Fe_(50)Pd_(50) tubes had an fcc crystal structure and were magnetically soft (H_c ≈10 kA/m), with the easy axis of the magnetization being parallel to the axes of the tubes. Angular-dependence measurements of the coercivity, where the hysteresis loops were measured as a function of the angle (θ) of the applied demagnetizing field, revealed a combination of magnetization reversal mechanisms, consisting of the curling mechanism, which dominates at low angles, with a transition to coherent rotation at angles >70°. The development of the coercivity with annealing temperature due to the L1_0 ordering was also investigated. For this purpose the as-deposited nanotubes were annealed at temperatures from 400 °C to 650 °C for 1 h in Ar+7% H_2 and the phase formation, the microstructure and the magnetic properties were analyzed. A maximum in the coercivity of 135 kA/m was achieved upon annealing at 550 °C
机译：将直径为200 nm，长度为1μm的近等原子的Fe-Pd基纳米管从单一电解质直接电沉积到聚碳酸酯模板中。然后对沉积的Fe_（50）Pd_（50）纳米管进行了成分，结构和磁性表征。沉积后的Fe_（50）Pd_（50）管具有fcc晶体结构，并且具有软磁性（H_c≈10kA / m），易磁化轴与管轴平行。矫顽力的角相关测量（其中磁滞回线是所施加的消磁场的角度（θ）的函数）揭示了磁化反转机制的组合，其中包括在低角度占优势的卷曲机制，以及在大于70°的角度过渡到相干旋转。还研究了由于L1_0有序性导致的矫顽力随退火温度的变化。为此目的，将沉积后的纳米管在400°C至650°C的温度下于Ar + 7％H_2中退火1小时，并分析相形成，微观结构和磁性。在550°C退火时，矫顽力最大值达到135 kA / m

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