Oxygen vacancies induced ferromagnetism in RF-sputtered and hydrothermally annealed zinc ferrite (ZnFe2O4) thin films

Exploring moisture adsorption on cobalt-doped ZnFe2O4 for applications in atmospheric water harvesting

“…With the help of oxygen vacancies, some antiferromagnetic couplings (Fe B 3+ –O 2− –Fe B 3+ ) are converted to ferromagnetic couplings (Fe B –Fe B ), so saturation magnetization increases. 46,47 In the case of Zn 0.4 Co 0.6 ·Fe 2 O 4 (after adsorption), the overall saturation magnetization decreased due to a reduction in the number of oxygen vacancies as water molecules were adsorbed on these oxygen vacancies. The saturation magnetization in Zn 0.4 Co 0.6 ·Fe 2 O 4 (after adsorption) was due only to the redistribution of Co 2+ and Fe 3+ .…”

“…Thus, oxygen vacancies are created by redistribution of Co2+ and Fe3+ at tetrahedral and octahedral sites. With the help of oxygen vacancies, some antiferromagnetic couplings (Fe B 3+ -O 2− -Fe B 3+ ) are converted to ferromagnetic couplings (Fe B -Fe B ), so saturation magnetization increases 46,47. In the case of Zn 0.4 Co 0.6 $Fe 2 O 4 (aer adsorption), the overall saturation magnetization decreased due to a reduction in the number of oxygen vacancies as water molecules were adsorbed on these oxygen vacancies.…”

A Strategy for Tuning the Structure, Morphology, and Magnetic Properties of MnFe2O4/SiO2 Ceramic Nanocomposites via Mono-, Di-, and Trivalent Metal Ion Doping and Annealing

“…Bigger nanoparticles resulted after annealing at 1200 °C form a uniform, compact and well-structured thin film with relatively irregular topography ( Figure 4 c,f,i,l,o,r) and relatively high surface roughness (2.28–4.78 nm, Table 2 ). Doped MnFe 2 O 4 thin films with similar roughness were obtained by various methods, such as sputtering [ 39 ], spin coating [ 40 ], and spray pyrolysis [ 41 ].…”

Innovative Nanomaterial Properties and Applications in Chemistry, Physics, Medicine, or Environment

“…nanomaterials are the most explored [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Nanoparticles’ properties make them appropriate applicants for technical applications in biosensors, humidity sensors, photocatalysis, magnets, drug delivery, magnetic refrigeration, magnetic liquids, photoluminescence, microwave absorbents, ceramic pigments, gas sensing, corrosion protection, water decontamination, antimicrobial agents, biomedicine, and catalysis [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Adjusting the nanoparticles’ shapes, sizes, and properties can be performed via the synthesis route, by modifying parameters such as the pH and concentration of reactants, dopants, or thermal treatment temperature and time [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”