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Experimental and theoretical investigations on magnetic behavior of (Al,Co) co-doped ZnO nanoparticles.
Nanoscale. 2010 Aug; 2(8):1505-11.N

Abstract

We present the structural and magnetic properties of Zn(0.95-x)Co(0.05)Al(x)O (x = 0.0 to 0.1) nanoparticles, synthesized by a novel sol-gel route followed by pyrolysis. Powder X-ray diffraction data confirms the formation of a single phase wurtzite type ZnO structure for all the compositions. The Zn(0.95)Co(0.05)O nanoparticles show diamagnetic behavior at room temperature. However, when Al is co-doped with Co with x = 0.0 to 0.10 in Zn(0.95-x)Co(0.05)Al(x)O, a systematic increase in ferromagnetic moment is observed up to x = 0.07 at 300 K. Above x = 0.07 (e.g. for x = 0.10) a drastic decrease in ferromagnetic nature is observed which is concomitant with the segregation of poorly crystalline Al rich ZnO phase as evidenced from TEM studies. Theoretical studies using density functional calculations on Zn(0.95-x)Co(0.05)Al(x)O suggest that the partial occupancy of S2 states leads to an increased double exchange interaction favoring the ferromagnetic ground states. Such ferromagnetic interactions are favorable beyond a threshold limit. At a high level doping of Al, the exchange splitting is reduced, which suppresses the ferromagnetic ordering.

Authors+Show Affiliations

Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20820743

Citation

Jayakumar, O D., et al. "Experimental and Theoretical Investigations On Magnetic Behavior of (Al,Co) Co-doped ZnO Nanoparticles." Nanoscale, vol. 2, no. 8, 2010, pp. 1505-11.
Jayakumar OD, Achary SN, Sudakar C, et al. Experimental and theoretical investigations on magnetic behavior of (Al,Co) co-doped ZnO nanoparticles. Nanoscale. 2010;2(8):1505-11.
Jayakumar, O. D., Achary, S. N., Sudakar, C., Naik, R., Salunke, H. G., Rao, R., Peng, X., Ahuja, R., & Tyagi, A. K. (2010). Experimental and theoretical investigations on magnetic behavior of (Al,Co) co-doped ZnO nanoparticles. Nanoscale, 2(8), 1505-11. https://doi.org/10.1039/c0nr00195c
Jayakumar OD, et al. Experimental and Theoretical Investigations On Magnetic Behavior of (Al,Co) Co-doped ZnO Nanoparticles. Nanoscale. 2010;2(8):1505-11. PubMed PMID: 20820743.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Experimental and theoretical investigations on magnetic behavior of (Al,Co) co-doped ZnO nanoparticles. AU - Jayakumar,O D, AU - Achary,S N, AU - Sudakar,C, AU - Naik,R, AU - Salunke,H G, AU - Rao,Rekha, AU - Peng,X, AU - Ahuja,R, AU - Tyagi,A K, Y1 - 2010/07/03/ PY - 2010/9/8/entrez PY - 2010/9/8/pubmed PY - 2010/12/30/medline SP - 1505 EP - 11 JF - Nanoscale JO - Nanoscale VL - 2 IS - 8 N2 - We present the structural and magnetic properties of Zn(0.95-x)Co(0.05)Al(x)O (x = 0.0 to 0.1) nanoparticles, synthesized by a novel sol-gel route followed by pyrolysis. Powder X-ray diffraction data confirms the formation of a single phase wurtzite type ZnO structure for all the compositions. The Zn(0.95)Co(0.05)O nanoparticles show diamagnetic behavior at room temperature. However, when Al is co-doped with Co with x = 0.0 to 0.10 in Zn(0.95-x)Co(0.05)Al(x)O, a systematic increase in ferromagnetic moment is observed up to x = 0.07 at 300 K. Above x = 0.07 (e.g. for x = 0.10) a drastic decrease in ferromagnetic nature is observed which is concomitant with the segregation of poorly crystalline Al rich ZnO phase as evidenced from TEM studies. Theoretical studies using density functional calculations on Zn(0.95-x)Co(0.05)Al(x)O suggest that the partial occupancy of S2 states leads to an increased double exchange interaction favoring the ferromagnetic ground states. Such ferromagnetic interactions are favorable beyond a threshold limit. At a high level doping of Al, the exchange splitting is reduced, which suppresses the ferromagnetic ordering. SN - 2040-3372 UR - https://www.unboundmedicine.com/medline/citation/20820743/Experimental_and_theoretical_investigations_on_magnetic_behavior_of__AlCo__co_doped_ZnO_nanoparticles_ L2 - https://doi.org/10.1039/c0nr00195c DB - PRIME DP - Unbound Medicine ER -