Structural, optical and magnetic properties of diluted magnetic semiconducting Zn1−xMnxO films

Tiwari, Ashutosh; Jin, Chunming; Kvit, A.; Kumar, Dhananjay; Muth, John F.; Narayan, J.

doi:10.1016/s0038-1098(01)00464-1

Cited by 223 publications

(120 citation statements)

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“…Both the existence and absence of FM have been reported in Mn-doped ZnO thin fi lms. Spin-glass behavior [4], paramagnetism [5], FM with a T C of 45 K [6], and room-temperature FM [7] have been observed. This suggests a strong dependence of magnetic properties on the sample-preparation conditions [8].…”

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confidence: 93%

Structure and magnetic properties of Mn-doped ZnO thin films

Zhang¹,

Li²,

Shi³

et al. 2007

J. Phys.: Condens. Matter

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We report the structure and magnetic properties of Zn1−xMnxO thin films grown on Si(001) substrates by pulsed laser deposition. Structure and phase evolution with Mn doping has been studied using x-ray diffraction, electron diffraction, and high-resolution electron microscopy. The undoped and 1% Mn-doped ZnO films are completely (001) oriented, and further Mn doping deteriorates the (001) orientation. For Mn concentrations below 3%, only the hexagonal ZnO phase exists in the films without secondary phases. As the Mn concentration reaches 5%, secondary phase Mn2O3 was found aggregating at grain boundaries. All the Mn-doped films show ferromagnetic properties at room temperature, and the magnetic moment decreases as the Mn concentration increases. Our results suggest that the ferromagnetism observed in Zn1−xMnxO thin films is intrinsic rather than associated with secondary phases.

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confidence: 93%

Structure and magnetic properties of Mn-doped ZnO thin films

Zhang¹,

Li²,

Shi³

et al. 2007

J. Phys.: Condens. Matter

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“…2,3 Many efforts have been directed toward experimental realization of high-temperature ferromagnetism ͑FM͒ in ZnO-based DMS. [4][5][6][7][8][9][10] Although roomtemperature FM has been observed in several ZnO-based materials, many controversial results also have been reported. For example, in Mn-doped ZnO, several groups have obtained various properties.…”

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confidence: 99%

“…For example, in Mn-doped ZnO, several groups have obtained various properties. Fukumura et al found a spinglass behavior; 5 Tiwari et al observed paramagnetism; 6 Jung et al observed FM with T c of 45 K. 7 This suggests a strong dependence of magnetic properties on the sample preparation conditions. Recently, Sharma et al found that lowtemperature synthesis could favor FM in Mn-doped ZnO, and room temperature FM was obtained.…”

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confidence: 99%

Sample preparation and annealing effects on the ferromagnetism in Mn-doped ZnO

Zhang

Skomski

Sellmyer

2005

Journal of Applied Physics

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Magnetic properties of Mn-doped ZnO strongly depend on sample preparation and annealing. While the samples sintered in air at 500°C show ferromagnetism at room temperature, those sintered at 900°C are paramagnetic. The samples sintered in vacuum show a ferromagnetic transition at 45K, which is attributed to ferrimagnetic Mn3O4. With an increase of annealing temperature, the ferromagnetism observed at room temperature in the low-temperature-sintered samples is gradually suppressed and finally completely removed. These results can be understood by considering a metastable ferromagnetic phase and its stability under varying temperatures and atmospheres.

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“…In the Mn-doped ZnO system, Fukumura et al [4] found a spin-glass behavior, Jung et al [5] observed ferromagnetic ordering with a T c ~ 45 K, and Tiwari et al [6] did not fi nd any ferromagnetism. Sharma et al [7] reported a confi rmation of the theoretical predication of ferromagnetism in Mndoped ZnO; weak ferromagnetic ordering above 300K was observed in both bulk pellets and in transparent fi lms 2-3 μm thick.…”

Section: Introductionmentioning

confidence: 99%

“…It has been theoretically predicted that, when suitably doped with transition metal ions (V, Mn, Fe, Co or Ni), ZnO might be made ferromagnetic with a Curie temperature higher than room temperature [2,3]. Extensive experiments have been carried out in many research groups in response to this prediction [4][5][6][7][8][9]. However, controversy between research groups was reported on the magnetic behavior of the materials.…”

Section: Introductionmentioning

confidence: 99%