Structure and magnetic properties of Ni-doped ZnO powder

Abstract

Ni-doped ZnO nanopowder (Zn_0.98Ni_0.2O) was synthesized by improved coprecipitation method. The average particle size of the powder was estimated to be 50 nm. The powder was then processed by thermal treatment. Samples were annealed at 1 073, 1 273, and 1 473 K, respectively. The solubility of NiO in ZnO and the lattice parameters of ZnO both increased with the temperature. The magnetic property of the doped samples was examined, and hysteresis loops were got. The results showed all the samples were ferromagnetic, while powder processed at 1 273 K for 4 h got a highest saturation magnetization (M _s) of 0.0457 emu/g. Also, magnetic properties were related to the grain size of the powder.

Keywords

ferromagnetism / diluted magnetic semiconductor / Ni-doped ZnO / coprecipitation / solid state reaction

References

[1] Lee H. J., Jeong S. Y., Cho C. R., . Study of Diluted Magnetic Semiconductor: Co-doped ZnO[J]. Appl. Phys. Lett., 2002, 81: 4 020-4 022.

[2] Pan F., Song C., Liu X. J., . Ferromagnetism and Possible Application in Spintronics of Transition-Metal-Doped ZnO Films[J]. Materials Science and Engineering R, 2008, 62: 1-35.

[3] Bratkovsky A M Spintronic Effects in Metallic, Semiconductor, Metal-oxide and Metal-semiconductor Heterostructures[ J]. Rep. Prog. Phys., 2008, 71: 026502

[4] Coey J. M. D., Douvalis A. P., Fitzgerald C. B., . Ferromagnetism in Fe-doped SnO₂ Thin Films[J]. Appl. Phys. Lett., 2004, 84: 1 332-1 334.

[5] Mao X. Y., Zhong W., Du Y. W. Ferromagnetism of Ni Cluster in Ni-doped ZnO by Solid State Reaction[J]. J. Magn. Magn. Mater., 2008, 320: 1 102-1 105.

[6] El-Hilo M., Dakhel A. A., Ali-Mohamed A. Y. Room Temperature Ferromagnetism in Nanocrystalline Ni-doped ZnO Synthesized by Co-precipitation[J]. J. Magn. Magn. Mater., 2009, 321: 2 279-2 283.

[7] Liu X J, Zhu X Y, Song C., . Intrinsic and Extrinsic Origins of Room Temperature Ferromagnetism in Ni-doped ZnO Films[J]. J. Appl. Phys., 2008, 103: 093911-7.

[8] Mandal S K, Das A K, Nath T K, . Temperature Dependence of Solubility Limits of Transition Metals(Co, Mn, Fe, and Ni) in ZnO Nanoparticles[J]. Appl. Phys. Lett., 2006, 89: 144105-3.

[9] Xu X. Y., Cao C. B. Structure and Ferromagnetic Properties of Co-doped ZnO Powders[J]. J. Magn. Magn. Mater., 2009, 321: 2 216-2 219.

[10] Chiang Y. M., Birnie D. P., Kingery W. D. Physical Ceramics[M], 1996 NJ John Wiley & Sons Inc. 193-195.

[11] Smith W. F., Hashemi J. Foundations of Materials Science and Engineering[M], 2004 3rd Ed. New York The McGraw-Hill Companies, Inc. 154-157.

[12] Li B. B., Xiu X. Q., Zhang R., . Study of Structure and Magnetic Properties of Ni-doped ZnO-based DMSs[J]. Materials Science in Semiconductor Processing, 2006, 9: 141-145.

[13] V K Sharma, G D Varma. Strain Induced Ferromagnetism in Sb Co-doped ZnMnO Samples[J]. J. Phys. Condense. Mater., 2009, 21: 296001(1–6)

[14] Schwarz D. A., Gamelin D. R. Reversible 300 K Ferromagnetic Ordering in a Deluted Magnetic Semiconductor[J]. Adv. Mater., 2004, 16(23–24): 2 115-2 119.