Investigations Of Lanthanum Doping On Magnetic Properties Of Nano Cobalt Ferrites

The magnetic properties of nano-crystallite cobalt lanthanum ferrite (CoLaxFe2-x O4) with varied quantities of lanthanum (x∈=∈0, 0.1, 0.15, 0.2, 0.25, 0.3) prepared by co-precipitation method have been studied by vibrating sample magnetometer (VSM) and LCR meter. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the size, structure, and morphology of the ferrite samples. The average crystallite size varied from 17.83 nm to 49.99 nm. All the samples, although, in nano range, show significant hysteresis. The saturation magnetization (Ms) values decreased from 60.57 emu/g to 30.15 emu/g. The remanence (MR) fell from 10.85 emu/g to 6.39 emu/g. Doping with lanthanum La3+ ions modulates significantly the magnetic properties of cobalt spinel ferrites without sacrificing the ferromagnetic character. © 2011 Springer Science+Business Media, LLC.2725155Thakur, S., Katyal, S.C., Singh, M., (2009) J. Magn. Magn. Mater., 1, p. 321Singhal, S., Barthwal, S.K., Chandra, K., XRD, magnetic and Mössbauer spectral studies of nano size aluminum substituted cobalt ferrites (CoAlxFe2-xO4) (2006) Journal of Magnetism and Magnetic Materials, 306 (2), pp. 233-240. , DOI 10.1016/j.jmmm.2006.03.023, PII S0304885306006330Valenzuela, R., Magnetic Ceramics, , (Cambridge University Press, New York, 1994)Iqbal, M.J., Siddiquah, M.R., Electrical and magnetic properties of chromium-substituted cobalt ferrite nanomaterials (2008) Journal of Alloys and Compounds, 453 (1-2), pp. 513-518. , DOI 10.1016/j.jallcom.2007.06.105, PII S0925838807015009Yan, C., Cheng, F., Peng, Z., Xu, Z., Liao, C., (1998) J. Appl. Phys., 84, p. 5703. , 10.1063/1.368834 1:CAS:528:DyaK1cXmvFyhurY%3DMathur, P., Thakur, A., Singh, M., (2007) Mod. Phys. Lett. B, 21, p. 1425. , 10.1142/S0217984907013651 1:CAS:528:DC%2BD2sXhtVejtLjNKumar, P., Sharma, S.K., Knobel, M., Singh, M., (2010) J. Alloys Compd., 508, p. 115. , 10.1016/j.jallcom.2010.08.007 1:CAS:528:DC%2BC3cXht1CitLbNCullity, B.D., (1978) Elements of X-ray Diffraction, , Addison-Wesley ReadingToksha, B.G., Shirsath, S.E., Patange, S.M., Jadhav, K.M., (2008) Solid State Comm., 147, p. 479. , 10.1016/j.ssc.2008.06.040 1:CAS:528:DC%2BD1cXps1eksb8%3DZhao, L., Yang, H., Yu, L., Cui, Y., Zhao, X., Feng, S., Magnetic properties of Re-substituted Ni-Mn ferrite nanocrystallites (2007) Journal of Materials Science, 42 (2), pp. 686-691. , DOI 10.1007/s10853-006-0273-7Ben Tahar, L., Artus, M., Ammar, S., Smiri, L.S., Herbst, F., Vaulay, M.J., Richard, V., Fievet, F., (2008) J. Magn. Magn. Mater., 320, p. 3242. , 10.1016/j.jmmm.2008.06.031 1:CAS:528:DC%2BD1cXht1GrsLfEKahn, M.L., Zhang, Z.J., (2001) Appl. Phys. Lett., 78, p. 3651. , 10.1063/1.1377621 1:CAS:528:DC%2BD3MXjvF2mtro%3DRezlescu, N., Rezlescu, E., Pasnicu, C., Craus, M.L., (1994) J. Phys.: Condens. Matter, 6, p. 5707. , 10.1088/0953-8984/6/29/013 1:CAS:528:DyaK2cXls1ylur8%3DPanda, R.N., Shih, J.C., Chin, T.S., (2003) J. Magn. Magn Mat., 257, p. 79. , 10.1016/S0304-8853(02)01036-3 1:CAS:528:DC%2BD3sXis1Wltw%3D%3DPrasad, S., Gajbhiye, N.S., (1998) J. Alloys Compd., 265, p. 87. , 10.1016/S0925-8388(97)00431-3 1:CAS:528:DyaK1cXhtVOmu7o%3DNgo, A.T., Bonville, P., Pileni, M.P., (2001) J. Appl. Phys., 89, p. 3370. , 10.1063/1.1347001 1:CAS:528:DC%2BD3MXhsFGgt7c%3DXiao, S.H., Xu, H.J., Hu, J., Li, L.Y., Li, X.J., (2008) Physica e, 40, p. 3064. , 10.1016/j.physe.2008.04.002 1:CAS:528:DC%2BD1cXhtVGlsrrJLiu, B.H., Ding, J., Strain-induced high coercivity in CoFe2 O4 powders (2006) Applied Physics Letters, 88 (4), pp. 1-3. , DOI 10.1063/1.2161808, 042506Wang, Y.C., Ding, J., Yi, J.B., Liu, B.H., Yu, T., Shen, Z.X., (2004) Appl. Phys. Lett., 84, p. 2596. , 10.1063/1.1695438 1:CAS:528:DC%2BD2cXivVaqt7w%3DSun-Ho, K., Yoo Iii, H., (2000) J. Appl. Phys, 88, p. 4754. , 10.1063/1.1312844 1:CAS:528:DC%2BD3cXmvFOmtLc%3DPearson, R.F., Annis, A.D., (1968) J. Appl. Phys., 39, p. 1338. , 10.1063/1.1656290 1:CAS:528:DyaF1cXptFWnug%3D%3