Magnetism of Co-doped ZnO epitaxially grown on a ZnO substrate

Li, Li; Guo, Yong; Cui, Xiangyuan; Zheng, Rongkun; Ohtani, K.; Kong, Charlie; Ceguerra, Anna V.; Moody, Michael P.; Ye, Jian Dong; Tan, H. H.; Jagadish, Chennupati; Liu, Hui; Stampfl, Catherine; Ohno, Hideo; Ringer, Simon P.; Matsukura, F.

doi:10.1103/physrevb.85.174430

Cited by 57 publications

(31 citation statements)

References 56 publications

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“…Practical devices require simultaneous control on spin state and charge of the electrons in semiconductors [2]. Among these semiconductors ZnO lightly doped with transition metals (Mn, Fe, Co, V, and Cr) [3]- [7] have gained much interest due to the presence of room temperature ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcination on Structural and Magnetic Properties of Co-Doped ZnO Nanostructures

et al. 2015

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Diluted magnetic semiconductors have gained much interest in spintronics due to the involvement of both spin and charge. Among various diluted magnetic semiconductors ZnO, lightly doped with transition metals (Mn, Fe, Co, Ni, In, V, and Cr), has gained interest due to the presence of room temperature ferromagnetism. Amongst various dopants, cobalt is a potential candidate because its ionic radius (Co 2+ =0.58Å) is extremely close to zinc (Zn 2+ =0.6Å). Zinc acetate dihydrate and cobalt nitrate are used as precursor materials. Nanostructures are synthesized at a low temperature of 70˚C. The dopant concentration is varied as 1, 3, 5, 7 and 9wt. %. XRD results indicate formation of hexagonal wurtzite structure even under as-synthesized conditions. Crystallite size decreases from 22.7nm to 17.8nm as dopant concentration was increased in the range 0-7wt%. XRD of the samples with 7wt% Co concentration is calcined in the temperature range of 100-500°C. SEM images show nanostructures with grain size less than 50nm. Saturation magnetization increases from 5.07emu/g to 6.4emu/g as dopant concentration was increased to 7wt% under as synthesized conditions. Nanostructures calcined at 400˚C show highest saturation magnetization of 9.9emu/g. Magnetic hysteresis equivalent to that of multilayered structure is obtained after calcination of Co doped ZnO nanoparticles at 300 °C. Single layer of these synthesized Co doped ZnO can be used instead of complex structures in spintronic devices.

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Section: Introductionmentioning

confidence: 99%

Effect of Calcination on Structural and Magnetic Properties of Co-Doped ZnO Nanostructures

et al. 2015

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“…Soon after this report, paramagnetic behavior of homogeneous Zn 0.75 Co 0.25 O prepared by PLD on Al 2 O 3 (0001) was also reported [184]. Since then, there have been a large number of reports on Co-doped ZnO prepared by various methods, such as chemical synthesis, chemical vapor transport, solid-state reaction, sputtering, ion implantation, atomic layer deposition, MOCVD, and MBE; some report ferromagnetism at room temperature and others paramagnetism [185][186][187][188][189][190][191][192][193]. There are also reports that suggest that the observed ferromagnetism is related to carrier-induced mechanism [185,186,194,195].…”

Section: Ii-vi-based Magnetic Semiconductorsmentioning

confidence: 99%

Magnetic Semiconductors

Matsukura

Ohno

2015

Handbook of Crystal Growth

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“…A prominent example is the investigation of nucleation during the early stages of phase transformations in materials [15][16][17][18][19]. Other popular applications include the onset of segregation of solute ions to defects in materials subject to extreme environments, such as ion/neutron irradiation [20][21][22][23], and the clustering of solute ions in semiconductor devices [24][25][26][27].…”

Section: Defining and Assessing Randomnessmentioning

confidence: 99%

Mining information from atom probe data

et al. 2015

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Whilst atom probe tomography (APT) is a powerful technique with the capacity to gather information containing hundreds of millions of atoms from a single specimen, the ability to effectively use this information creates significant challenges. The main technological bottleneck lies in handling the extremely large amounts of data on spatial-chemical correlations, as well as developing new quantitative computational foundations for image reconstruction that target critical and transformative problems in materials science. The power to explore materials at the atomic scale with the extraordinary level of sensitivity of detection offered by atom probe tomography has not been not fully harnessed due to the challenges of dealing with missing, sparse and often noisy data. Hence there is a profound need to couple the analytical tools to deal with the data challenges with the experimental issues associated with this instrument. In this paper we provide a summary of some key issues associated with the challenges, and solutions to extract or "mine" fundamental materials science information from that data.

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Magnetism of Co-doped ZnO epitaxially grown on a ZnO substrate

Cited by 57 publications

References 56 publications

Effect of Calcination on Structural and Magnetic Properties of Co-Doped ZnO Nanostructures

Effect of Calcination on Structural and Magnetic Properties of Co-Doped ZnO Nanostructures

Magnetic Semiconductors

Mining information from atom probe data

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