Defect induced room temperature ferromagnetism in high quality Co-doped ZnO bulk samples

Synergistically Augmented ZnO via Cobalt and Copper Simultaneous Doping for Pollutant Reduction

“…Herein, it was reported that due to the close ionic radii between zinc and cobalt and the fact that the four‐coordinate peak of the cobalt ion has a zinc substitution character, no ZnO crystal distortion was observed [14] . The extrinsic doping of cobalt in the zinc oxide lattice without creating any Wurtzite structure distortion was also reported in different works [24,25] . However, unlike cobalt, copper doping results in the formation of independent copper oxide peaks at lower copper amounts.…”

“…[14] The extrinsic doping of cobalt in the zinc oxide lattice without creating any Wurtzite structure distortion was also reported in different works. [24,25] However, unlike cobalt, copper doping results in the formation of independent copper oxide peaks at lower copper amounts. For example, the copper-doped ZnO study conducted by Morales-Mendoza et al [26] and Mahmoud et al [27] showed the formation of copper-independent peaks above 6 % and 4 % copper amounts, respectively.…”

Size-dependent d0 room temperature ferromagnetism in undoped In2S3 nanoparticles

“…6(a)), with the introduction of the In interstitial, the valence band is pushed down and the conduction band is stretched until crossing the Fermi energy level, but no resultant spin polarization phenomenon is observed. 40 Thus, the S vacancy and the In interstitial defects have no influence on the generation of magnetism. In the case of the In 31 S 48 and In 30 S 48 systems, the significant asymmetric distributions of two spin channels near the Fermi energy level suggest the d 0 ferromagnetism characteristics, implying that In vacancy defects may be responsible for the ferromagnetism observed in the In 2 S 3 supercell.…”

Investigation of ferromagnetism and dual donor defects in Y-doped ZnO thin films

“…The magnetic property of transition metal doped ZnO is vastly studied in the last two decades, after Dietl et al predicted the possibility of room temperature ferromagnetism (RTFM) in Mndoped ZnO [2]. ZnO is a metal oxide of paramount interest due to its promising properties such as wide and direct band gap (∼3.37 eV at RT), large exciton binding energy (60 meV at RT) [3], non-toxicity and abundance [4]. It has wide applications in the fields of optoelectronics [5], piezoelectrics [6], gas sensing [7] and thin film transistors [8].…”