Actas de congresos
Size Dependent Magnetic Behaviour Of Nanocrystalline Spinel Ferrite Mg 0.95mn 0.05fe 2o 4
Registro en:
Indian Journal Of Pure And Applied Physics. , v. 45, n. 1, p. 16 - 20, 2007.
195596
2-s2.0-34547312306
Autor
Sharma S.K.
Kumar R.
Kumar V.V.S.
Dolia S.N.
Gupta A.
Reddy V.R.
Knobel M.
Singh M.
Institución
Resumen
Mg 0.95Mn 0.05Fe 2O 4 ferrite nanoparticles having dimensions varying from 4.7-12 nm, have been synthesized by using solid-state reaction technique followed by high-energy ball milling for different times. An X-ray diffraction study indicates the presence of single-phase cubic spinel structure. The particle sizes were estimated from the X-ray line broadening of the (311) reflection using Debye-Scherrer's formula. The size-dependent magnetic properties of Mg 0.95Mn 0.05Fe 2O 4 nanoparticles were studied using SQUID magnetometry techniques. The saturation magnetization M s at 5 K obtained by extrapolating M versus 1/H plot to 1/H = 0 were decreased with the decrease in the particle size. The coercive force of the nanoparticles has a clear size-dependence below the blocking temperature. The calculated anisotropy constant was found to be rather large for nanoparticle samples. All these results can be explained on the basis of single-domain superparamagnetic effects. 45 1 16 20 (1992) Magnetic Properties of Fine Particles, , edited by J L Dorman & D Fiorani North-Holland, Amsterdam Chen, Q., Zhang, Z.J., (1998) Appl Phys Lett, 73 (21), p. 3156 Chudnosky, E.M., Gunther, L., (1998) Phys Rev Lett, 60, p. 661 Morales M P, Serna C J Serna, Bodker F Bodker & Morup S, J Phys: Condens Matter, 9 (1997) 5461Raj, K., Moskowitz, R., Casciari, R., (1995) J Magn Magn Mater, 149, p. 174 McMichael, R.D., Shull, R.D., Swartzendruber, L.J., Bennett, L.H., (1992) J Magn Magn Mater, 111, p. 29 (1997) Scientific anil Clinical Applications of Magnetic Carriers, , Hafeli U, Schutt W, Teller J & Zborowski M, Eds, Plenum, New York Verma, A., Goel, T.C., Mendiratta, R.G., (2000) Mater Sei Technol, 16, p. 712 Kim, Y.I., Kim, D., Lee, C.S., (2003) Physica B, 337, pp. 42-51 Chandana, R., Mishra, N., Anand, C.S., Das, R.P., Sahu, K., Upadhyay, K.C., Verma, H.C., (2000) Appl Phys Lett, 76 (4), p. 475 Sepelak, V., Baabe, D., Mienert, D., Schultze, D., Krumeich, F., Litterst, F.J., Becker, K.D., (2003) J Magn Magn Mater, 257, p. 377 Bid, S., Banerjee, A., Kumar, S., Pradhan, S.K., Udayan, D., Banerjee, D., (2001) J Alloys & Compounds, 326, pp. 292-297 Chinnasamy, C.N., Narayanasamy, A., Ponpandian, N., Chattopadhyay, K., (2001) Materials Science and Engineering A, 304-306, pp. 983-987 Cullity, B.D., (1978) Elements of X-ray Diffraction, , Addison-Wesely, Reading, MA Neel, L., (1949) Ann Geophys, 5, p. 99