Mn-doped ZnO

FIGURE 6.6 XRD pattern (unirradiated and irradiated with 50 MeV LF+ ion beam) of 2 at% Mn-doped ZnO sample. (From Neogi, S.K., Chattopadhyay, S., Baneijee, A., Bandyopadhyay, S., Sarkar, A., and Kumar, R., Effect of 50 MeV Li3 + irradiation on structural and electrical properties of Mn doped ZnO, J. Phys. Condens. Matter, 23, 2011. With permission from lOP Publishing Ltd.)... 

Chattopadhyay S, Dutta S, Banerjee A, Jana D, Bandyopadhyay S, Chattopadhyay S, Sarkar A, Synthesis and characterization of single-phase Mn-doped ZnO, Phys. B, 404, 1509-1514, 2009. 

Chattopadhyay S, Neogi S K, Banerjee A, Bandyopadhyay S, Mukadam M D, Yusuf S M, Sarkar A, Defect induced ferromagnetism in Mn doped ZnO, J. Magn. Magn. Mater., 323, 363-368, 2011. 

Fukumura T, Zhengwu J, Kawasakib M, Shono T, Hasegawa T, Koshihara S, Koinuma H, Magnetic properties of Mn-doped ZnO, Appl. Phys. Lett, 78, 958-960, 2001. 

Karmakara R, Neogi S K, Baneijeea A, Bandyopadhyay S, Banerjee A, Mallik A, Maity P K, Absence of ferromagnetism in Mn doped ZnO, AIP Conf. Proc., 1347, 206-209, 2011. 

Sharma P, Gupta A, Owens F J, Inoued A, Rao K V, Room temperature spintronic material—Mn-doped ZnO revisited, J. Magn. Magn. Mater., 282, 115-121, 2004. 

Sato and Katayama-Yoshida [68] performed first principles ab initio calculations of the electronic structures of TM-doped ZnO and proposed the double exchange mechanism for the carrier-induced ferromagnetism. The first principles calculations predict that transition metals V, Ct Fe, Co, and Ni-doped ZnO [87] showed ferromagnetism with concentration from 5 to 25%, whereas the Mn-doped ZnO shows spin-glass state at ground state because of the exact half-filled d state of Mn ions [68]. For comparison, Cr +, Fe +, Co +, and Ni have d, d, d, d, and... 

Figure 5.15 The B3LYP DOSsof(a) Cu-doped ZnO and (b) Mn-doped ZnO. Positive and negative DOSs are for spin-up and spin-down electrons, respectively. In (a), the supercell consists of eight primitive cells of ZnO, in which one Zn ion is substituted by Cu. Ferromagnetic ordering of Cu ions is assumed. The magnetic...

With increasing Mn content, the lattice constants a and c of wurtzite Zni Mn O increase due to the fact that the ionic radius of Mn (0.66 A) is larger than that of Zn (0.60 A) [23, 119, 121, 132,135], and the bandgap expands with considerable mid-gap absorption. This mid-gap absorption peak centered around 3 eV in Mn-doped ZnO is usually broad and structureless at room temperature owing to the overlap of the intra-d shell transitions of Mn from its ground state Aj (S) to Tj (G),... 

Figure 5.19 (a) Bright-fleld cross-sectional TEM image of the Mn-doped ZnO thin film. The interfaces of undoped ZnO buffer/sapphire and Mn-doped ZnO/undoped ZnO buffer are indicated by arrows. Atrimetallic (AIMn)Zn03 phase was found in the ZnO/sapphire interface... 

Figure 5.22 Ferro- and paramagnetic resonance spectra for a nominal 2at.% Mn- doped ZnO pellet (a) Ferromagnetic resonance spectra for a sample sintered at 500°C. (b) Room-temperature paramagnetic resonance spectra for the same sample sintered at 900 C. (After Ref. [16].)...

Fukumura, T, Jin, Z., Ohtomo, A., Koiniuna, H. and Kawasaki, M. (1999) An oxide-diluted magnetic semiconductor Mn-doped ZnO. Applied Physics letters, 75, 3366. 

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