High-temperature ferromagnetism in pulsed-laser deposited epitaxial (Zn,Mn)O thin films: Effects of substrate temperature

Pradhan, A. K.; Zhang, Kai; Mohanty, Shalini; Dadson, J.B.; Hunter, D.; Zhang, Jun; Sellmyer, David J.; Roy, Utpal; Cui, Yongjie; Bürger, A.; Mathews, Scott A.; Joseph, Boby; Sekhar, B.R.; Roul, B. K.

doi:10.1063/1.1897827

Cited by 62 publications

(30 citation statements)

References 16 publications

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“…Work by Pradhan et al indicated that Zn 1−x Mn x O films grown at a substrate temperature of 500 °C exhibited room temperature ferromagnetism and growths beyond 500 °C showed a decrease in the magnetization due to the formation of Mn-related clusters [11]. Furthermore, Cheng et [14].…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and magnetic properties of Zn1−xMnxO micro-rod arrays synthesized by spray pyrolysis method

et al. 2012

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Undoped and Mn-doped ZnO micro-rod arrays were fabricated by the spray pyrolysis method on glass substrates. X-ray diffraction and scanning electron microscopy showed that these micro-rod arrays had a polycrystalline wurtzite structure and high c-axis preferred orientation.Photoluminescence studies at 10 K show that the increase of manganese content leads to a relative decrease in deep level band intensity with respect to undoped ZnO. Magnetic measurements indicated that undoped ZnO was diamagnetic in nature whereas Mn-doped ZnO samples exhibited ferromagnetic behavior at room temperature, which is possibly related to the substitution of Mn ions (Mn 2+ ) for Zn ions in the ZnO lattice.

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Section: Introductionmentioning

confidence: 99%

Structural, optical and magnetic properties of Zn1−xMnxO micro-rod arrays synthesized by spray pyrolysis method

et al. 2012

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“…The XRD results of high oxygen pressure growth are similar to our previous report in which a narrow FWHM was seen with increasing substrate temperature. 17 Apparently, the ͑002͒ peaks for the as-grown and annealed films at 600°C turn out to be a superposition of two peaks, one from ZnO and the other from Mn-doped ZnO. We argue that a small amount of Mn is incorporated into the Zn site and forms a minority phase.…”

mentioning

confidence: 72%

“…17,18 As-doped ZnO the films were in situ annealed in nitrogen for 5 min at 200°C. The resistivity of the p-type ZnMnO films is in the range of 1 -2 ⍀ cm with hole concentrations between ͑4-8͒ ϫ 10 17 cm −3 .…”

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confidence: 99%

Oxide-based dilute ferromagnetic semiconductors: ZnMnO and Co:TiO2

Pradhan

Hunter

Lasley-Hunter

et al. 2006

Journal of Applied Physics

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We report on ferromagnetic properties of ZnMnO and Co:TiO2 films grown by pulsed laser deposition with varying growth conditions. We have demonstrated that ZnMnO films show ferromagnetic properties at room temperature. However, oxygen plays a dominant role in the occurrence of ferromagnetism. Introducing carriers into ZnMnO films did not improve the ferromagnetic properties. Our experimental results indicate that the mechanism for ferromagnetism lies, probably, within the perspective of charge transfer between Mn ions through oxygen. On the other hand, our experimental results suggest that the ferromagnetism in Co:TiO2 films is controlled by the presence of small metal Co2+ clusters in the rutile TiO2 matrix, which are mainly present at the interface and on the surface of the films.

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“…It is observed that FWHM decreases significantly from 0.36 to 0. 26 as T s increases from 300 C to 400 C. 18 However, it is clear that the AZO peaks become more intense as the T s increases due to enhanced texturing of the films. On the contrary, FWHM bounces back to 0.30 , probably due to induced disorders caused by heavy Al doping or creations of Al 2 O 3 clusters.…”

Section: Methodsmentioning

confidence: 98%

Influence of growth temperature on electrical, optical, and plasmonic properties of aluminum:zinc oxide films grown by radio frequency magnetron sputtering

Dondapati

Santiago

Pradhan

2013

Journal of Applied Physics

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We have investigated the responsible mechanism for the observation of metallic conductivity at room temperature and metal-semiconductor transition (MST) at lower temperatures for aluminum-doped zinc oxide (AZO) films. AZO films were grown on glass substrates by radio-frequency magnetron sputtering with varying substrate temperatures (T s ). The films were found to be crystalline with the electrical resistivity close to 1.1 Â 10 À3 X cm and transmittance more than 85% in the visible region. The saturated optical band gap of 3.76 eV was observed for the sample grown at T s of 400 C, however, a slight decrease in the bandgap was noticed above 400 C, which can be explained by Burstein-Moss effect. Temperature dependent resistivity measurements of these highly conducting and transparent films showed a MST at $110 K. The observed metal-like and metal-semiconductor transitions are explained by taking into account the Mott phase transition and localization effects due to defects. All AZO films demonstrate crossover in permittivity from positive to negative and low loss in the near-infrared region, illustrating its applications for plasmonic metamaterials, including waveguides for near infrared telecommunication region. Based on the results presented in this study, the low electrical resistivity and high optical transmittance of AZO films suggested a possibility for the application in the flexible electronic devices, such as transparent conducting oxide film on LEDs, solar cells, and touch panels. V C 2013 AIP Publishing LLC. [http://dx

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High-temperature ferromagnetism in pulsed-laser deposited epitaxial (Zn,Mn)O thin films: Effects of substrate temperature

Abstract: Mathews, S.; Joseph, B.; Sekhar, B.R.; and Roul, B.K., "High-temperature ferromagnetism in pulsed-laser deposited epitaxial (Zn,Mn)O thin films: Effects of substrate temperature" (2005). David Sellmyer Publications. 11.

Cited by 62 publications

References 16 publications

Structural, optical and magnetic properties of Zn1−xMnxO micro-rod arrays synthesized by spray pyrolysis method

Structural, optical and magnetic properties of Zn1−xMnxO micro-rod arrays synthesized by spray pyrolysis method

Oxide-based dilute ferromagnetic semiconductors: ZnMnO and Co:TiO2

Influence of growth temperature on electrical, optical, and plasmonic properties of aluminum:zinc oxide films grown by radio frequency magnetron sputtering

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