Anomalous stepped-hysteresis and T-induced unit-cell-volume reduction in carbon nanotubes continuously filled with faceted Fe3C nanowires
Anomalous stepped-hysteresis and T-induced unit-cell-volume reduction in carbon nanotubes continuously filled with faceted Fe3C nanowires
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连续填充多面 Fe3C 纳米线的碳纳米管中的异常阶梯滞后和 T 诱导的晶胞体积减小
DOI：
10.1088/2632-959x/abe605
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发表时间：
2021-02
期刊：
影响因子：
3
通讯作者：
Filippo S. Boi
中科院分区：
文献类型：
--
作者：
Jiachen Xia;Jian Guo;Xi Zhang;Mu Lan;Jiqiu Wen;Shanling Wang;Yi He;Gang Xiang;Anna Corrias;Filippo S. Boi
铁磁填充碳纳米管近年来被认为是应用于数据记录量子磁盘器件的重要候选材料。实现高填充率的铁磁材料是特别需要的应用。本文报道了一种新颖的观察结果，即碳纳米管沿着毛细管连续填充了异常μm长的多面Fe3C纳米线。反常的磁性特征可能是由于晶体表面的应变效应报道。磁化测量结果显示，在300 K和2 K时出现了不寻常的阶梯式磁滞回，同时在低温时矫顽力出现了异常下降。观察到的不寻常的磁滞形状归因于在铁磁面内或在铁磁面边界处存在反铁磁跃迁。矫顽力值随温度的降低而降低，磁滞特性宽度随磁场的增加而增强，表明层状反铁磁相的存在，可能存在于纳米线表面的富应变区。零场冷却（ZFC）和场冷却（FC）磁曲线证明了磁不可逆性的存在，这是由竞争的反铁磁和铁磁相互作用引起的可能的自旋玻璃行为的指示。通过低温XRD测试，进一步揭示了Fe3C单元胞平均参数的微小变化，表明在低温下没有额外的单元胞体积引起的铁磁转变。
Ferromagnetically-filled carbon nanotubes have been recently considered important candidates for application into data recording quantum disk devices. Achievement of high filling rates of the ferromagnetic materials is particularly desirable for applications. Here we report the novel observation of carbon nanotubes continuously filled along the capillary with unusual μm-long faceted Fe3C nanowires. Anomalous magnetic features possibly due to strain effects of the crystal facets are reported. Magnetization measurements revealed unusual stepped magnetic hysteresis-loops at 300 K and at 2 K together with an anomalous decrease in the coercivity at low temperature. The observed unusual shape of the hysteresis is ascribed to the existence of an antiferromagnetic transition within or at the boundary of the ferromagnetic facets. The collapse in the coercivity value as the temperature decreases and the characteristic width-enhancement of the hysteresis with the field increasing appear to indicate the existence of layered antiferromagnetic phases, possibly in the strain-rich regions of the nanowire facets. Zero field cooled (ZFC) and field cooled (FC) magnetic curves evidenced presence of magnetic irreversibilities, an indicator of a possible spin-glass-like behavior induced by competing antiferromagnetic and ferromagnetic interactions. Characterization performed with low temperature XRD measurements, further revealed a slight variation in the average Fe3C unit cell parameters, suggesting the absence of additional unit-cell volume induced ferromagnetic transitions at low temperature.
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影响因子：
2.8
作者：
B. Satishkumar;A. Govindaraj;P. Vanitha;A. Raychaudhuri;C. Rao
通讯作者：
B. Satishkumar;A. Govindaraj;P. Vanitha;A. Raychaudhuri;C. Rao
填充 FePd3 纳米晶体的碳洋葱石墨排列中温度驱动的结构转变
影响因子：
10.9
作者：
Boi, Filippo S.;Ivaturi, Sameera;Zhang, Xiaotian
通讯作者：
Zhang, Xiaotian
影响因子：
5.6
作者：
Urdampilleta M;Nguyen NV;Cleuziou JP;Klyatskaya S;Ruben M;Wernsdorfer W
通讯作者：
Wernsdorfer W
影响因子：
8.6
作者：
W. Wernsdorfer;E. B. Orozco;K. Hasselbach;A. Benoît;B. Barbara;N. Demoncy;Annick Loiseau;H. Pascard;D. Mailly
通讯作者：
W. Wernsdorfer;E. B. Orozco;K. Hasselbach;A. Benoît;B. Barbara;N. Demoncy;Annick Loiseau;H. Pascard;D. Mailly
DOI：
10.1051/epjconf/20134015007
发表时间：
2013
期刊：
--
影响因子：
--
作者：
M. Mihálik;J. Lazúrová;M. Fitta;M. Vávra
通讯作者：
M. Mihálik;J. Lazúrová;M. Fitta;M. Vávra