Room-temperature ferromagnetic properties in Mn-doped rutile thin films

Kim, Kwang Joo; Park, Young Ran; Lee, Jung Han; Choi, Seung-li; Lee, Hee Jung; Kim, Chul Sung; Park, Jae Yun

doi:10.1016/j.jmmm.2007.02.093

Cited by 28 publications

(11 citation statements)

References 14 publications

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“…Many experimental studies reported on the synthesis and the characterization of 3d TM doped rutile TiO2 materials. 26,36,39,40,[43][44][45]47,51,[83][84][85][86][87][88][89][90][91] Figure 6b sums up the domain limits of cationic species in this specific host material as proposed by Mizushima et al [43][44][45]47 based on experimental (e.g., photocurrent) and theoretical (semi-empirical model supported by photoconductivity and photo-ESR measurements) considerations. Namely, experimentally observed ionic species in TiO2rutile, i.e., V 5+ , V 4+ and V 3+ 26,44,51 , Mn 4+ , Mn 3+ and Mn 2+ 47,51,83-85 , Fe 4+ and Fe 3+ 39,43,47,51,86,88,91 , Cu 2+ and possibly Cu + 89,90 , and Ni 3+ and Ni 2+ 36,40,51 , possibly stabilized for different material's shape (nanorods, nanopowders, thin films) are predicted from our simulations.…”

Section: Transition Metal Impuritiesmentioning

confidence: 99%

Ab Initio Prediction of the Redox Potentials of 3d Transition Metals Embedded in a Semiconducting Host Lattice

2021

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Here, we report a theoretical investigation devoted to the ab initio determination of the redox potentials E(D n+ /D n+1 ) of a dopant D in a given host lattice. The knowledge of these potentials is of capital importance to anticipate its attainable oxidation states (versus the synthesis conditions).Hereafter the host lattice has been selected to be the well-known rutile TiO2 compound due to its interest for many applications, the simplicity of its crystal structure and the large number of already collected data. Dopants are 3d transition metals (i.e., V, Mn, Fe, Ni and Cu) substituting titanium atoms. First-principles methods combined to the SCAN functional were used to determine the electronic properties of doped materials considering the supercell approach. The stability of point defects (intrinsic and extrinsic) at different charge states are discussed based on the estimation of their defect formation enthalpies, and the associated charge transition levels are calculated and positioned in the gap of the un-doped material.

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Section: Transition Metal Impuritiesmentioning

confidence: 99%

Ab Initio Prediction of the Redox Potentials of 3d Transition Metals Embedded in a Semiconducting Host Lattice

2021

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“…Hall measurement results of Co doped anatase (n type) TiO 2 thin film was reported by Ramaneti et al, [20] where they found a carrier concentration of 5 × 10 18 cm −3 with the Hall mobility of 17 cm 2 /Vs. Kim et al, [21] showed that Fe-doped (2.4 at.%) p-TiO 2 thin film offers lower carrier density (∼10 17 cm −3 ) compared to its undoped n-type counterpart.…”

Section: A Materials Characterizationsmentioning

confidence: 99%

Highly Repeatable Low-ppm Ethanol Sensing Characteristics of p-TiO<sub>2</sub>-Based Resistive Devices

et al. 2015

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In this paper, we report on the development of a highly sensitive, relatively low-temperature ethanol sensor based on sol-gel derived p-TiO 2 thin film. The p-type anatase TiO 2 thin film was deposited by sol-gel technique on a thermally oxidized <100> p-Si (resistivity 5 cm) substrate. Anatase TiO 2 phase with <101> nanocrystallinity was confirmed with an average particle size of ∼11 nm from X-ray diffraction and field emission scanning electron microscopic study. Ethanol sensor study, in the resistive mode, was carried out at a relatively low operating temperature range (75°C-175°C) for sensing low concentrations of ethanol in air (5-100 ppm). Response magnitude of ∼146% was observed at 150°C toward 100-ppm ethanol (in air) with corresponding response time and recovery time of 39 and 15 s, respectively. The sensor showed appreciably highresponse magnitude (129%) even at low ethanol concentration (5 ppm) with acceptable response and recovery time (54 and 22 s, respectively) at the same operating temperature (150°C). At a particular temperature, for all the ethanol concentrations, sensor showed minimal base line resistance drift, thereby offering highly repeatable and stable sensing performance. Ethanol selectivity study against other volatile organic compounds, such as methanol, acetone, and 2-butanone, was also investigated and was found to be quite promising. Ethanol sensing mechanism for such p-type TiO 2 has also been discussed in the light of corresponding oxygen vacancy model. Index Terms-p-TiO 2 , ethanol sensing, high response, relatively low operating temperature, low concentrations, repeatibility, selectivity.

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“…From the XPS and XRD analyses, the absence of metallic Co or Co-related magnetic oxides was confirmed, hence, the enhancement in magnetic moment for doped samples is not because of magnetic Co clusters. This enhancement in the magnetic moment is, maybe, due to the exchange interaction between the sp-bond electrons or holes and the d-electron spins localized at the magnetic ions [49], super exchange between complexes (oxygen vacancies + magnetic impurities), which are stabilized by the electron transfer from vacancies to impurities [26] and magnetic polaron formed by the trapped electrons in oxygen vacancy and magnetic ions around it [27]. So, it is concluded that the oxygen vacancies play an important role for FM ordering but the doping enhances the ferromagnetic ordering.…”

Section: F Vsm Analysismentioning

confidence: 99%

Oxygen Deficiency and Room Temperature Ferromagnetism in Undoped and Cobalt-Doped $\hbox{TiO}_{\bm 2}$ Nanoparticles

Rajkumar

Ramachandran

2011

IEEE Trans. Nanotechnology

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The compositional analysis done on the synthesized undoped and cobalt (Co)-doped titanium dioxide (TiO 2 ) nanoparticles by X-ray photoelectron spectroscopy and energy dispersive X-ray analysis suggests oxygen deficiency in undoped and Co-doped TiO 2 samples. Magnetic investigations by vibrating sample magnetometer (VSM) indicate that undoped TiO 2 nanoparticles possess ferromagnetic ordering at room temperature due to the oxygen deficiency and in Co-doped TiO 2 , the enhancement in magnetic moment is due to Co doping.Index Terms-Cobalt (Co), ferromagnetic materials, oxygen compounds.

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Room-temperature ferromagnetic properties in Mn-doped rutile thin films

Cited by 28 publications

References 14 publications

Ab Initio Prediction of the Redox Potentials of 3d Transition Metals Embedded in a Semiconducting Host Lattice

Ab Initio Prediction of the Redox Potentials of 3d Transition Metals Embedded in a Semiconducting Host Lattice

Highly Repeatable Low-ppm Ethanol Sensing Characteristics of p-TiO<sub>2</sub>-Based Resistive Devices

Oxygen Deficiency and Room Temperature Ferromagnetism in Undoped and Cobalt-Doped $\hbox{TiO}_{\bm 2}$ Nanoparticles

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