1. Prinz GA (1998) Magnetoelectronics. Science 282:1660-1663 2. Wolf S, Awschalom D, Buhrman R et al (2001) Spintronics:a spin-based electronics vision for the future. Science 294:1488-1495 3. Tanaka M, Higo Y (2001) Large tunneling magnetoresistance in GaMnAs/AlAs/GaMnAs ferromagnetic semiconductor tunnel junctions. Phys Rev Lett 87:026602 4. Pearton S, Abernathy C, Overberg M et al (2003) Wide band gap ferromagnetic semiconductors and oxides. J Appl Phys 93:1-13 5. Wang Y, Liu H, Li Z et al (2006) Role of structural defects on ferromagnetism in amorphous Cr-doped TiO2 films. Appl Phys Lett 89:042511 6. Kiomarsipour N, Razavi RS (2012) Characterization and optical property of ZnO nano-, submicro-and microrods synthesized by hydrothermal method on a large-scale. Superlattices Microstruct 52:704-710 7. Dietl T, Ohno H, Matsukura F (2001) Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductors. Phys Rev B 63:195205 8. Jalbout AF, Chen H, Whittenburg SL (2002) Monte Carlo simulation on the indirect exchange interactions of Co-doped ZnO film. Appl Phys Lett 81:2217-2219 9. Kumar S, Basu S, Rana B et al (2014) Structural, optical and magnetic properties of sol-gel derived ZnO:Co diluted magnetic semiconductor nanocrystals:an EXAFS study. J Mater Chem C 2:481-495 10. Vijayaprasath G, Murugan R, Asaithambi S et al (2016) Structural and magnetic behavior of Ni/Mn co-doped ZnO nanoparticles prepared by co-precipitation method. Ceram Int 42:2836-2845 11. Straumal BB, Protasova SG, Mazilkin AA et al (2013) Ferromagnetic behavior of Fe-doped ZnO nanograined films. Beilstein J Nanotechnol 4:361 12. Liu H, Cheng X, Liu H et al (2012) Properties of Cu and V codoped ZnO nanoparticles annealed in different atmospheres. Superlattices Microstruct 52:1171-1177 13. Singh RPP, Hudiara I, Panday S et al (2016) The effect of Co doping on the structural, optical, and magnetic properties of Fedoped ZnO nanoparticles. J Supercond Novel Magn 29:819-827 14. Saleem M, Siddiqi SA, Atiq S et al (2011) Carriers-mediated ferromagnetic enhancement in Al-doped ZnMnO dilute magnetic semiconductors. Mater Charact 62:1102-1107 15. Luthra V (2014) Tweaking electrical and magnetic properties of Al-Ni co-doped ZnO nanopowders. Ceram Int 40:14927-14932 16. Wu Z, Cheng K, Zhang F et al (2014) Effect of Al co-doping on the electrical and magnetic properties of Cu-doped ZnO nanorods. J Alloys Compd 615:521-525 17. Siddheswaran R, Medlin R, Bělský P et al (2014) Heterogeneous phase formation in diluted magnetic semiconducting Zn1-x-yCox AlyO (CAZO) nanoparticles. RSC Adv 4:23405-23411 18. Chang G, Kurmaev E, Boukhvalov D et al (2009) Co and Al codoping for ferromagnetism in ZnO:Co diluted magnetic semiconductors. J Phys Condens Matter 21:056002 19. Jannesari M, Asemi M, Ghanaatshoar M (2017) Sol-gel preparation of Fe and Al co-doped ZnO nanostructured materials. J Sol Gel Sci Technol 83:181-189 20. Liu H, Zhang X, Li L et al (2007) Role of point defects in roomtemperature ferromagnetism of Cr-doped ZnO. Appl Phys Lett 91:072511 21. Ramachandran S, Narayan J, Prater J (2006) Effect of oxygen annealing on Mn doped ZnO diluted magnetic semiconductors. Appl Phys Lett 88:242503 22. Yu CF, Lin TJ, Sun SJ et al (2007) Origin of ferromagnetism in nitrogen embedded ZnO:N thin films. J Phys D Appl Phys 40:6497 23. Singhal R, Sharma S, Kumari P et al (2011) Study of electronic structure and magnetization correlations in hydrogenated and vacuum annealed Ni doped ZnO. J Appl Phys 109:063907 24. Su X, Jia Y, Liu X et al (2014) Preparation, dielectric property and infrared emissivity of Fe-doped ZnO powder by coprecipitation method at various reaction time. Ceram Int 40:5307-5311 25. Hong NH, Sakai J, Huong NT et al (2005) Role of defects in tuning ferromagnetism in diluted magnetic oxide thin films. Phys Rev B 72:045336 26. Kumar S, Kim Y, Koo B et al (2009) Structural and magnetic properties of chemically synthesized Fe doped ZnO. J Appl Phys 105:07C520 27. Tang G, Shi X, Huo C et al (2013) Room temperature ferromagnetism in hydrothermally grown Ni and Cu co-doped ZnO nanorods. Ceram Int 39:4825-4829 28. Srinet G, Varshney P, Kumar R et al (2013) Structural, optical and magnetic properties of Zn1-xCoxO prepared by the sol-gel route. Ceram Int 39:6077-6085 29. Zhong M, Li Y, Tariq M et al (2016) Effect of oxygen vacancy induced by a pulsed magnetic field on the room-temperature ferromagnetic Ni-doped ZnO synthesized by hydrothermal method. J Alloys Compd 675:286-291 30. Tariq M, Li Y, Li W et al (2018) Ferromagnetic coupling of Fe3+-VO-Fe3+ polarons in Fe-doped ZnO. Ceram Int 44:71-75 31. Zhu M, Zhang Z, Zhong M et al (2017) Oxygen vacancy induced ferromagnetism in Cu-doped ZnO. Ceram Int 43:3166-3170 32. Wang S, Bo W, Zhong M et al (2012) Effect of Cr content on the properties of magnetic field processed Cr-doped ZnO-diluted magnetic semiconductors. J Nanomater. https://doi.org/10.1155/2012/501069 33. Chen GJ, Chang YS (2016) Effects of annealing atmospheres on the structure and ferromagnetic properties of Fe0.12Cu0.02Zn0.86O thin films. Ceram Int 42:18025-18030 34. Xia C, Hu C, Tian Y et al (2011) Room-temperature ferromagnetic properties of Fe-doped ZnO rod arrays. Solid State Sci 13:388-393 35. Wagner C, Riggs W, Davis L et al (1979) Handbook of X-ray photoelectron spectroscopy:a reference book of standard data for use in X-ray photoelectron spectroscopy. Perkin-Elmer Corp, Eden Prairie, MN 36. Goktas A, Aslan F, Yeşilata B et al (2018) Physical properties of solution processable n-type Fe and Al co-doped ZnO nanostructured thin films:role of Al doping levels and annealing. Mater Sci Semicond Process 75:221-233 37. Chen M, Wang X, Yu Y et al (2000) X-ray photoelectron spectroscopy and auger electron spectroscopy studies of Al-doped ZnO films. Appl Surf Sci 158:134-140 38. Das J, Pradhan S, Sahu D et al (2010) Micro-Raman and XPS studies of pure ZnO ceramics. Phys B Condens Matter 405:2492-2497 39. Umar A, Hahn Y (2006) Aligned hexagonal coaxial-shaped ZnO nanocolumns on steel alloy by thermal evaporation. Appl Phys Lett 88:173120 40. Khanbareh H, Hegde M, van der Zwaag S et al (2015) Joint IEEE international symposium on the applications of ferroelectric (ISAF). International symposium on integrated functionalities (ISIF), and piezoelectric force microscopy workshop (PFM) 41. Jule L, Dejene F, Ali AG et al (2017) Defect-induced room temperature ferromagnetic properties of the Al-doped and undoped ZnO rod-like nanostructure. Mater Lett 199:151-155 42. Phan TL, Nghia N, Yu S (2012) Raman scattering spectra and magnetic properties of polycrystalline Zn1-xCoxO ceramics. Solid State Commun 152:2087-2091 43. Hernández S, Cauda V, Hidalgo D et al (2014) Fast and low-cost synthesis of 1D ZnO-TiO2 core-shell nanoarrays:Characterization and enhanced photo-electrochemical performance for water splitting. J Alloys Compd 615:S530-S537 44. Asemi M, Ghanaatshoar M (2016) Conductivity improvement of CuCrO2 nanoparticles by Zn doping and their application in solid-state dye-sensitized solar cells. Ceram Int 42:6664-6672 45. Elilarassi R, Chandrasekaran G (2017) Optical, electrical and ferromagnetic studies of ZnO:Fe diluted magnetic semiconductor nanoparticles for spintronic applications. Spectrochim Acta Part A Mol Biomol Spectrosc 186:120-131 46. Zhang Y, Yang Y, Zheng J et al (2009) Thermal properties of glass frit and effects on Si solar cells. Mater Chem Phys 114:319-322 47. Bhat SV, Deepak F (2005) Tuning the bandgap of ZnO by substitution with Mn2+, Co2+, and Ni2+. Solid State Commun 135:345-347 48. Dong S, Xu K, Liu J et al (2011) Photocatalytic performance of ZnO:Fe array films under sunlight irradiation. Phys B Condens Matter 406:3609-3612 49. Panigrahy B, Aslam M, Bahadur D (2012) Effect of Fe doping concentration on optical and magnetic properties of ZnO nanorods. Nanotechnology 23:115601 50. Si X, Liu Y, Wu X et al (2015) Al-Mg co-doping effect on optical and magnetic properties of ZnO nanopowders. Phys Lett A 379:1445-1448 51. Santara B, Giri P, Dhara S et al (2014) Oxygen vacancy-mediated enhanced ferromagnetism in undoped and Fe-doped TiO2 nanoribbons. J Phys D Appl Phys 47:235304 52. Das J, Mishra D, Sahu D et al (2011) Influence of Ni doping on magnetic behavior of Mn doped ZnO. Mater Lett 65:598-601 53. Coey J, Venkatesan M, Fitzgerald C (2005) Donor impurity band exchange in dilute ferromagnetic oxides. Nat Mater 4:173-179 |