Exploring structural, optical, and magnetic analysis of dilute Co incorporated CdS thick films for spintronics

IF 2.4 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Current Applied Physics Pub Date : 2025-05-08 DOI:10.1016/j.cap.2025.04.009

Aeshah Alasmari , Salma Alshehri , Abdulaziz Almalki , Fahad Algarni , Hosam M. Gomaa , F.M. Aldosari , Atef Ismail

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Abstract

This study involves the preparation using a solid-state reaction method of six thin films of Cd_1-xCo_xS by varying the concentrations of cobalt and cadmium, where x = 0.0, 0.02, 0.04, 0.06, 0.08, and 0.1 At. %. The process included mixing Co₂S₃ and CdS powders in stoichiometric ratios, followed by mechanical ball milling, compacting into discs, and analyzing the films' properties. X-ray diffraction (XRD) confirmed the films' crystalline structure and energy-dispersive X-ray spectroscopy (EDX) verified the elemental composition, indicating the successful incorporation of Co into the CdS matrix. X-ray photoelectron spectroscopy (XPS) further detailed the chemical states within the films, showing that Co substitution influenced optical properties. The films' optical transmittance decreased with higher Co content, while reflectance and absorption increased, attributed to Co's impact on the electronic structure. The study also demonstrated a decrease in crystallite size and an increase in lattice strain with rising Co concentration, suggesting a reduction in crystallinity. Optical analyses revealed a decrease in the energy band gap and an increase in refractive index as Co content increased. The refractive index was modeled using the Cauchy equation, and the study noted a corresponding rise in static refractive index and dielectric constant, implying enhanced electromagnetic energy storage capability. Additionally, the magnetic properties showed room-temperature ferromagnetism (RT-FM) across all films, with significant values for saturation magnetization, coercivity, and retentivity.

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用于自旋电子学的稀钴镉厚膜的结构、光学和磁分析探索

本研究通过改变钴和镉的浓度（x = 0.0、0.02、0.04、0.06、0.08和0.1 At），采用固相反应方法制备了六层cd1 - xcox薄膜。%。该过程包括将Co2S3和CdS粉末按化学计量比混合，然后进行机械球磨，压实成圆盘，并分析薄膜的性能。x射线衍射（XRD）证实了薄膜的晶体结构，能量色散x射线光谱（EDX）证实了元素组成，表明Co成功掺入到CdS基体中。x射线光电子能谱（XPS）进一步详细描述了薄膜内的化学状态，表明Co取代影响了光学性质。随着Co含量的增加，薄膜的透光率降低，反射率和吸收率增加，这是由于Co对电子结构的影响。该研究还表明，随着Co浓度的升高，晶体尺寸减小，晶格应变增加，表明结晶度降低。光学分析表明，随着Co含量的增加，能带隙减小，折射率增加。利用柯西方程对折射率进行建模，研究发现静态折射率和介电常数相应增加，这意味着电磁能量存储能力增强。此外，所有薄膜的磁性都表现出室温铁磁性（RT-FM），具有显著的饱和磁化、矫顽力和保留率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Current Applied Physics 物理-材料科学：综合

CiteScore

4.80

自引率

0.00%

发文量

213

审稿时长

33 days

期刊介绍： Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.