Barrera Gabriele, Scaglione Federico, Celegato Federica, Coïsson Marco, Tiberto Paola, Rizzi Paola
Istituto Nazionale di Ricerca Metrologica (INRIM), Str. delle Cacce, 91, 10135 Torino, Italy.
Dipartimento di Chimica e Centro Interdipartimentale NIS (Nanostructured Surfaces and Interfaces), Università di Torino, Via Pietro Giuria 7, 10125 Torino, Italy.
Nanomaterials (Basel). 2023 Jan 26;13(3):494. doi: 10.3390/nano13030494.
The connection of multidisciplinary and versatile techniques capable of depositing and modeling thin films in multistep complex fabrication processes offers different perspectives and additional degrees of freedom in the realization of patterned magnetic materials whose peculiar physical properties meet the specific needs of several applications. In this work, a fast and cost-effective dealloying process is combined with a fast, low-cost, scalable electroless deposition technique to realize hybrid magnetic heterostructures. The gold nanoporous surface obtained by the dealloying of an AuSiCuAgPd ribbon is used as a nanostructured substrate for the electrodeposition of cobalt. In the first steps of the deposition, the Co atoms fill the gold pores and arrange themselves into a patterned thin film with harder magnetic properties; then they continue their growth into an upper layer with softer magnetic properties. The structural characterization of the hybrid magnetic heterostructures is performed using an X-ray diffraction technique and energy-dispersive X-ray spectroscopy, while the morphology of the samples as a function of the electrodeposition time is characterized by images taken in top and cross-section view using scanning electron microscopy. Then, the structural and morphologic features are correlated with the room-temperature magnetic properties deduced from an alternating-gradient magnetometer's measurements of the hysteresis loop and first order reversal curves.
在多步复杂制造过程中，能够沉积和塑造薄膜的多学科通用技术的结合，为实现具有特殊物理性质以满足多种应用特定需求的图案化磁性材料提供了不同的视角和额外的自由度。在这项工作中，一种快速且经济高效的脱合金工艺与一种快速、低成本、可扩展的化学镀技术相结合，以实现混合磁性异质结构。通过对AuSiCuAgPd带材进行脱合金获得的金纳米多孔表面用作钴电沉积的纳米结构基底。在沉积的第一步，钴原子填充金孔隙并排列成具有较硬磁性能的图案化薄膜；然后它们继续生长成具有较软磁性能的上层。使用X射线衍射技术和能量色散X射线光谱对混合磁性异质结构进行结构表征，而样品的形态作为电沉积时间的函数则通过使用扫描电子显微镜在顶视图和横截面视图中拍摄的图像来表征。然后，将结构和形态特征与由交变梯度磁力计测量磁滞回线和一阶反转曲线得出的室温磁性相关联。
