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Thickness dependence of the anomalous Hall effect in disordered face-centered cubic FePt alloy filmsThickness dependence of the anomalous Hall effect in disordered face-centered cubic FePt alloy filmsThickness dependence of the anomalous Hall effect in disordered face-centered cubic FePt alloy films 下载免费PDF全文
The anomalous Hall effect in disordered face-centered cubic (fcc) FePt alloy films is experimentally studied. The longitudinal resistivity independent term of the anomalous Hall conductivity (AHC) increases and approaches saturation with increasing film thickness. The contribution of side jump scattering is suggested to decrease monotonically with increasing film thickness, which can be ascribed to the variation of the surface scattering with the film thickness. The sign of the skew scattering contribution to the AHC is opposite to that of the intrinsic contribution in the system. 相似文献
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Since the exchange bias (EB) effect was discovered in the Co/CoO core-shell nanoparticles, it has been extensively studied in various ferromagnet (FM)/antiferromagnet (AFM) bilayers due to its crucial role in spintronics devices. In this article, we review the investigation of the EB in our research group. First, we outline basic features of the EB, including the effects of the constituent layer thickness, the microstructure and magnetization of the FM layers, and we also discuss asymmetric magnetization reversal process in wedged-FM/AFM bilayers. Secondly, we discuss the mechanisms of the positive EB and the perpendicular EB. Thirdly, we demonstrate the hysteretic behavior of the angular dependence of the EB and analyze the EB training effect. Finally, we discuss the roles of the rotatable anisotropy in the two phenomena. 相似文献
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采用低能团簇柬流淀积(LECBD)装置,在不同温度的衬底上,制备得到不同形貌的锑化锢团簇颗粒,如三角形颗粒、六边形薄片和长方体颗粒等,形貌的差别认为是由锑化锢各向异性生长所致。 相似文献
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利用自组装的嵌段聚合物有序图案为模板来制备有序金属颗粒纳米阵列是人们关注的热点之一。本文概述了最近利用团簇束流沉积系统将银团簇淀积在聚苯乙烯-聚丁二烯-聚苯乙烯(SBS)三嵌段聚合物自组装形成的有序图案上,制备了有序的银纳米颗粒阵列材料,如线形银团簇颗粒阵列和二维银团簇颗粒阵列。利用自编的径向分布函数计算程序对线形银团簇颗粒阵列进行了定量分析,进一步定标了这种线形阵列的有序度,发现在同一线形阵列内有小部分银团簇是近接排列的,大部分团簇颗粒是等间距排列的。同时探讨了这些有序阵列形成的机制。并讨论了利用紫外-可见分光光度计和拉曼谱仪研究这些有序阵列所得到的相关性质。 相似文献
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A significant exchange bias(EB) training effect has been observed in sputter deposited FeAu/FeNi bilayers, wherein the exchange field(HE) exhibits a special sign-changeable temperature dependence. Very interestingly, despite the absence of multiple easy axes in the FeAu spin glass(SG) layer, HEdrops abruptly between the first and second magnetic cycles,which is followed by a more gradual continuous change in the subsequent cycles. This training behavior cannot be described by the empirical n-1/2law because of the asymmetric magnetization reversal processes. We propose modifying Binek’s model to include the asymmetric changes of the pinning SG spins at the descending and ascending branches. This new model successfully describes the EB training effect in FeAu/FeNi bilayers. 相似文献
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利用自组装的嵌段聚合物有序图案为模板来制备有序金属颗粒纳米阵列是人们关注的热点之一.本文概述了最近利用团簇束流沉积系统将银团簇淀积在聚苯乙烯-聚丁二烯-聚苯乙烯(SBS)三嵌段聚合物自组装形成的有序图案上,制备了有序的银纳米颗粒阵列材料,如线形银团簇颗粒阵列和二维银团簇颗粒阵列.利用自编的径向分布函数计算程序对线形银团簇颗粒阵列进行了定量分析,进一步定标了这种线形阵列的有序度,发现在同一线形阵列内有小部分银团簇是近接排列的,大部分团簇颗粒是等间距排列的.同时探讨了这些有序阵列形成的机制.并讨论了利用紫外-可见分光光度计和拉曼谱仪研究这些有序阵列所得到的相关性质. 相似文献
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Thickness dependence of the anomalous Hall effect in disordered face-centered cubic FePt alloy films 下载免费PDF全文
The anomalous Hall effect in disordered face-centered cubic(fcc) FePt alloy films is experimentally studied. The longitudinal resistivity independent term of the anomalous Hall conductivity(AHC) increases and approaches saturation with increasing film thickness. The contribution of side jump scattering is suggested to decrease monotonically with increasing film thickness, which can be ascribed to the variation of the surface scattering with the film thickness. The sign of the skew scattering contribution to the AHC is opposite to that of the intrinsic contribution in the system. 相似文献
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The subwavelength tuned magneto-optical Kerr effect in L1_0-FePt films with perpendicular magnetic anisotropy 下载免费PDF全文
For L10-FePt films with strong perpendicular anisotropy covered by arrays of hexagonal close-packed polystyrene spheres(PSSs),fine structures are observed in magneto-optical Kerr rotation spectra in the visible spectral range.The reflection minima are found to be located at the same wavelengths as the Kerr rotation peaks.The Kerr rotation enhancement is attributed to the excitation of both the surface plasmon polariton in the dielectric PSS/metal interface and the guide waves(guide mode)in the PSS array.The two-dimensional PSSs/SiO2/FePt system exhibiting a tunable magneto-optical Kerr effect and a high perpendicular magnetic anisotropy will be helpful for designing and fabricating magneto-optics devices. 相似文献