Evidence of Room Temperature Ferromagnetism in Zn1-xSnxS Thin Films

被引:20
作者
Kumar, K. Chaitanya [1 ]
Kaleemulla, S. [2 ]
Krishnamoorthi, C. [3 ]
Rao, N. Madhusudhana [4 ]
Rao, G. Venugopal [5 ]
机构
[1] VIT, Sch Adv Sci, Thin Films Lab, Vellore 632014, Tamil Nadu, India
[2] VIT, Ctr Crystal Growth, Thin Films Lab, Vellore 632014, Tamil Nadu, India
[3] VIT, Ctr Nanotechnol Res, Vellore 632014, Tamil Nadu, India
[4] VIT AP, Dept Phys, Amaravathi 522034, Andhra Pradesh, India
[5] Indira Gandhi Ctr Atom Res, Mat Phys Div, Kalpakkam 603102, Tamil Nadu, India
关键词
Thin films; Physical vapor deposition; Crystal structure; Ferromagnetism; Transmittance; OPTICAL-PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; MAGNETIC-PROPERTIES; ZNS; GROWTH;
D O I
10.1007/s10948-018-4868-4
中图分类号
O59 [应用物理学];
学科分类号
摘要
Tin (Sn)-doped zinc sulfide (Zn1-xSnxS) thin films at different tin (Sn) concentrations (= 0.00, 0.02, 0.05, and 0.08) were coated onto Corning 7059 glass substrates using the electron beam evaporation technique. The films were subjected to different characterization techniques to study the physical properties of the thin films. The structural properties of the films were studied using a powder X-ray diffractometer (XRD), and it was found that the films were cubic in structure without any impurity phases. The crystallite size increased with an increase of Sn concentration, and the mean crystallite size was 21 nm. The chemical composition and surface morphology of the films were studied using scanning electron microscopy (FE-SEM) with energy-dispersive analysis of X-rays (EDAX). Optical properties such as transmittance and absorbance were recorded using a diffuse reflectance spectroscope (UV-vis-NIR). All the films exhibited high optical transmittance of 85% in the visible region of the solar spectrum. The band gap of the films was calculated using Tauc's relation, and it was found that it increased from 3.53 to 3.57 eV with an increase in the Sn doping concentration from x = 0.02 to x = 0.08. The room temperature photoluminescence studies of the films were recorded using a fluorescence spectrophotometer, and it was found that the films exhibited a prominent emission peak at 420 nm. The magnetic properties of the films and glass substrates at room temperature were studied using a vibrating sample magnetometer. From this, it was found that the films were weakly ferromagnetic at room temperature and the strength of magnetization increased with an increase of doping concentration from x = 0.02 to x = 0.05 and decreased at higher doping concentrations (x = 0.08). The films showed high magnetization at x = 0.05. The films at x = 0.05 exhibited the magnetization (M-s), retentivity (M-r), and coercive fields (H-c) 18 x 10(-6) emu/cm(3), 1.6 x 10(-6) emu/cm(3), and 91.80 Oe, respectively.
引用
收藏
页码:1725 / 1734
页数:10
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