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Your search keyword '"Dai, J.M."' showing total 100 results
Start Over Author "Dai, J.M." Publication Type Academic Journals
100 results on '"Dai, J.M."'

26. Effect of Li substitution on the crystal structure and magnetoresistance of LaMnO3

Author

Ye, S.L., Song, W.H., Dai, J.M., Wang, S.G., Wang, K.Y., Yuan, C.L., and Sun, Y.P.

Subjects
Crystals -- Magnetic properties, Perovskite -- Research, Physics -- Research, Semiconductor doping -- Research, Physics
Abstract

Research describing the characteristics of perovskite manganites with doped alkali-metal is presented. In particular the the magnetoresistance and crystal structure of lithium doped LaMnO3 compounds is investigated.

Published
2000

35. Visible-light induced persistent photoconductivity in trilayered films of perovskite manganites

Author

Dai, J.M., Song, W.H., Wang, S.G., Wang, K.Y., Ye, S.L., Du, J.J., and Sun, Y.P.

Subjects
Magnetism -- Research, Perovskite -- Research, Thin films -- Magnetic properties, Physics
Abstract

Research into the persistent photoconductivity effect in trilayered films consisting of perovskite manganites La2/3Ca1/3MnO3/(La0.3Nd0.7)2.3Ca1/3MnO3La2/3Ca1/3MnO3(LNL) is presented. It is suggested that the trilayered film LNL is of the nature of the cluster-glass state at low temperatures below 85 K.

Published
2001

36. Preparation and magnetic properties of the double perovskite A2FeMoO6 (A=Ca, Sr, Ba) polycrystals with nanometer-scale particles

Author

Song, W.H., Dai, J.M., Ye, S.L., Wang, K.Y., Du, J.J., and Sun, Y.P.

Subjects
Perovskite -- Research, Polycrystalline semiconductors -- Research, Physics
Abstract

It has been possible to extend the sol-gel technique to make a series of polycrystalline materials A2FeMoO6 (A=Sr, Ca, Ba) with nanometer-scale grain size. It is established that the nanometer-scale grain samples have different magnetic properties from the large grain samples with micrometer scale. This can be explained in terms of size effect.

Published
2001

37. Effect of Li doping on the charge ordering state of La0.5Ca0.5MnO3

Author

Ye, S.L., Song, W.H., Dai, J.M., Wang, K.Y., Wang, S.G., Du, J.J., and Sun, Y.P.

Subjects
Ferromagnetism -- Research, Physics
Abstract

Research into the impact of Li doping on the charge ordering state of perovskite-type manganates La0.5Ca(sub 0.5-x)Li(sub x)MnO3 with x = 0, 0,05, 0.1, 0.15 and 0.2 is presented. It was found that Li doping can destroy the charge ordering state and induce the ferromagnetic metallic state.

Published
2001

39. Structural, magnetic, electrical transport properties, and reversible room-temperature magnetocaloric effect in antipervoskite compound AlC[Mn.sub.3]

Author

Wang, B.S., Lin, J.C., Tong, P., Zhang, L., Lu, W.J., Zhu, X.B., Yang, Z.R., Song, W.H., Dai, J.M., and Sun, Y.P.

Subjects
Aluminum compounds -- Structure, Aluminum compounds -- Magnetic properties, Aluminum compounds -- Electric properties, Carbon compounds -- Structure, Carbon compounds -- Magnetic properties, Carbon compounds -- Electric properties, Physics
Abstract

Several studies are conducted to explain the structural, magnetic and the electrical transport properties of the antipervoskite compound, AlC[Mn.sub.3]. The electronic resistivity of the system is shown to be highly dependent on the temperature.

Published
2010

40. Thermal history dependent photoconductivity in [Pr.sub.0.5][Sr.sub.0.5]Mn[O.sub.3] thin film

Author

Hu, L., Sun, P., Wang, B., Sheng, Z.G., Luo, X., Zhu, X.B., Yang, Z.R., Song, W.H., Dai, J.M., Yin, Z.Z., and Wu, W.B.

Subjects
Magnetic fields -- Analysis, Manganese -- Thermal properties, Manganese -- Magnetic properties, Manganese -- Optical properties, Praseodymium -- Optical properties, Praseodymium -- Magnetic properties, Praseodymium -- Thermal properties, Strontium -- Thermal properties, Strontium -- Optical properties, Strontium -- Magnetic properties, Physics
Abstract

Thermal history dependent photoconductivity is seen in the thermal hysteresis region of [Pr.sub.0.5][Sr.sub.0.5]Mn[O.sub.3] thin film. The studies have shown the external magnetic field has played a similar role as the light illumination.

Published
2009

41. The observation of a positive magnetoresistance and close correlation among lattice, spin, and charge around [T.sub.C] in antipervoskite SnC[Mn.sub.3]

Author

Wang, B.S., Tong, P., Sun, Y.P., Zhu, X.B., Song, W.H., Yan, Z.R., and Dai, J.M.

Subjects
Magnesium compounds -- Magnetic properties, Magnesium compounds -- Thermal properties, Magnesium compounds -- Electric properties, Magnesium compounds -- Analysis, Physics
Abstract

The temperature dependences of magnetization, electrical transport and thermal transport properties of antiperovskite compound SnC[Mn.sub.3] are examined. The results have shown an essential interaction among lattice, spin, and charge degrees of freedom around ferrimagnetic-paramagnetic transition ([T.sub.C]).

Published
2009

42. Reversible room-temperature magnetocaloric effect with large temperature span in antiperovskite compounds [Ga.sub.1?x]C[Mn.sub.3+x] (x=0, 0.06, 0.07, and 0.08)

Author

Wang, B.S., Tong, P., Sun, Y.P., Zhu, X.B., Luo, X., Li, G., Song, W.H., Yang, Z.R., and Dai, J.M.

Subjects
Critical point -- Evaluation, Manganese -- Electric properties, Manganese -- Magnetic properties, Manganese -- Thermal properties, Gallium -- Electric properties, Gallium -- Magnetic properties, Gallium -- Thermal properties, Magnetic fields -- Analysis, Physics
Abstract

A study of magnetic and reversible room-temperature magnetocaloric properties of antiperovskite compounds of [Ga.sub.1-x]C[Mn.sub.3+x] with large temperature span is reported. The results indicated the application of [Ga.sub.1-x]C[Mn.sub.3+x] as a promising candidate for magnetic refrigeration around room temperature.

Published
2009

47. Magnetism of CoFe2O4 thin films annealed under the magnetic field.

Author

Dai, Y.Q., Dai, J.M., Tang, X.W., Zi, Z.F., Zhang, K.J., Zhu, X.B., Yang, J., and Sun, Y.P.

Subjects
*COBALT compounds, *MAGNETISM, *POLYCRYSTALS, *THIN films, *SILICON, *ANNEALING of metals, *MAGNETIC fields
Abstract

Polycrystalline CoFe 2 O 4 thin films were deposited on Si (100) substrates by chemical solution deposition with and without magnetic annealing. Magnetic field directions were applied parallel and perpendicular to the film surface during the magnetic annealing process. The variations of strain, microstructure and magnetic anisotropy of the films caused by the magnetic annealing are investigated. The results show that the film densification is promoted and grain morphology is changed by the magnetic annealing, which can be attributed to the promoting effect of magnetization force on the grain growing and grain boundary diffusing. Magnetic measurements indicate the enhancement of anisotropy and saturation magnetizations of the polycrystalline CoFe 2 O 4 after magnetic annealing. Furthermore, the rotation of easy axis along the field direction, the increased occupation of Co 2+ ions at B sites and the additional strain induced by the magnetic field are considered as the main reasons of the increased magnetic anisotropy. [ABSTRACT FROM AUTHOR]

Published
2015
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48. Thickness effect on the properties of BaTiO3–CoFe2O4 multilayer thin films prepared by chemical solution deposition.

Author

Dai, Y.Q., Dai, J.M., Tang, X.W., Zhang, K.J., Zhu, X.B., Yang, J., and Sun, Y.P.

Subjects
*BARIUM compounds, *THIN films, *THICKNESS measurement, *CHEMICAL solution deposition, *STRAINS & stresses (Mechanics), *GRAIN size, *MICROCRACKS
Abstract

Highlights: [•] BaTiO3–CoFe2O4 multilayer films were prepared by chemical solution deposition. [•] The strain is relaxed and the grain size is increased with the films thickness. [•] Permittivity and saturation polarization increase with the films thickness. [•] A decrease in saturation magnetization of the thickest film is observed. [•] The effect of the microcracks on the films properties is also investigated. [ABSTRACT FROM AUTHOR]

Published
2014
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