Dielectric and magnetic properties of (Zn, Co) co-doped SnO ₂ nanoparticles

Abstract

Polycrystalline samples of (Zn, Co) co-doped SnO 2 nanoparticles were prepared using a co-precipitation method. The influence of (Zn, Co) co-doping on electrical, dielectric, and magnetic properties was studied. All of the (Zn, Co) co-doped SnO 2 powder samples have the same tetragonal structure of SnO 2 . A decrease in the dielectric constant was observed with the increase of Co doping concentration. It was found that the dielectric constant and dielectric loss values decrease, while AC electrical conductivity increases with doping concentration and frequency. Magnetization measurements revealed that the Co doping SnO 2 samples exhibits room temperature ferromagnetism. Our results illustrate that (Zn, Co) co-doped SnO 2 nanoparticles have an excellent dielectric, magnetic properties, and high electrical conductivity than those reported previously, indicating that these (Zn, Co) co-doped SnO 2 materials can be used in the field of the ultrahigh dielectric material, high frequency device, and spintronics.

The effect of Mn and Co dual-doping on the structural, optical, dielectric and magnetic properties of ZnO nanostructures

“…When ZnO is heavily doped (Mn ¼ 2 and Co ¼ 6%), the ZnO lattice's rapid expansion and the FM ordering may be destroyed due to signicant structural disorder. 40 The observed highest M r for 4% Co (Mn2Co4) is higher than that reported in the literature. 48 The origin of RTFM in DMS is an open-ended question that may originate from many potential sources.…”

“…The single or double ionized vacancies are formed when these oxygen vacancies are ionized. 40 The randomly oriented combination of negative and positive vacancies constitutes a large dipole moment that can only be polarized in the presence of an external applied field. 41 These dipole moments will be field-aligned in the presence of an external field, resulting in RDP.…”

“… 6 On the other hand, ion vibrations might be the only way for ε ′′ steady behaviour at high f s . 40 …”

“…6 On the other hand, ion vibrations might be the only way for 3 00 steady behaviour at high fs. 40 3.8 Electrical conductivity Fig. 5(c) shows the f-dependent s ac for the pure and Mn, Co doped ZnO nanoparticles measured at room temperature.…”

Effect of Sr and Co co-doping on the TiO2-diluted magnetic semiconductor for spintronic applications

“…In contrast to that, metal oxide at the nanoscale has advancements in physical, mechanical, and chemical properties [11,12]. Metal oxides are broadly studied because of their interesting and exclusive properties and numerous applications [13,14].…”