Abstract
Three series of NiMgCuZn ferrites were prepared by conventional sintering process. The formation of single phase in these ferrites was confirmed by x-ray diffraction. Initial permeability measurements on these samples were carried out in the temperature range of 30–400°C. The effect of the external applied stress on the open magnetic circuit type coil with these ferrites was studied by applying uniaxial compressive stress parallel to magnetizing direction and the change in the inductance was measured. The variation of ratio of inductance (ΔL/L)% increases upto certain applied compressive stress and there after it decreases, showing different stress sensitivities for different compositions of ferrites studied in the present work. With a view to develop stress insensitive NiMgCuZn ferrite, a low stress sensitivity composition among all the ferrites studied was chosen and different amounts of SiO2 were added to it and a series of ferrite compositions were prepared. The variation of ratio of inductance (ΔL/L)% with external applied compressive stress was examined. These results show that, 0.05 wt% SiO2 added Ni0.3Mg0.3Cu0.1Zn0.3Fe2O4 ferrite exhibited stress insensitivity. It was noticed that addition of SiO2 was found to be effective in reducing the stress sensitivity. This was confirmed from the elastic behaviour studies at room temperature on these ferrite samples. These studies were carried out to develop a ferrite composition for its use as core material for microinductor applications.
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References
X. Qi, J. Zhou, Z. Yue, Z. Gui, L. Li, J. Magn. Magn. Mater. 251, 316 (2002)
J. Shin, Y. Jeong, J. Hahn, B. Song, J. Magn. Soc. Jpn. 22(Suppl S1), 292 (1998)
A. Nakano, T. Suzuki, H. Momoi, J. Jpn. Sci. Powd. Powd. Metall. 49, 77 (2002)
H. Su, H. Zhang, X. Tang, Y. Jing, Y. Liu, J. Magn. Magn.Mater. 310, 17 (2007)
Y. Ikeda, M. Kumagai, J. Jpn.Sci. Powd. Powd. Metall. 45, 53 (1998)
H. Fujji, S. Harada, T. Kawamata, J. Magn. Soc. Jpn. 22(Suppl S1), 311 (1998)
D.N. Bhosale, S.R. Sawant, S.A. Gangal, R.R. Mahajan, P.P. Bakare, Mater. Sci. Engg. B65, 79 (1999)
J. Park, J. Kim, S. Cho, J. Phys IV France, 7 (1997), Colloq. C1, Suppl. (1997) C1-193, C1-194
N. Rezlescu, E. Rezlescu, P.D. Popa, L. Craus, L. Rezlescu, J. Magn. Magn. Mater. 182, 199 (1998)
J.G. Koh, K.U. Kim, New Phys. (Korean Phys. Soc.) 26, 540 (1986)
N. Ramamanohar Reddy, E. Rajagopal, K.V. Siva Kumar, K.K. Patankar, V.R.K. Murthy, J. Electroceramics, 11, 167 (2003)
A. Globus, P. Duplex, M. Guyot, IEEE Trans. Magn. Mag. 7, 617 (1971)
A. Globus, P. Duplex, J. Appl. Phys. 39, 723 (1988)
Baca, R. Valenzuela, M.A. Escobar, L.F. Magna, J. Appl. Phys. 57, 4183 (1985)
T.Y. Byun, S.C. Bycon, K.S. Hong, IEEE Trans. Magn. 35, 3445 (1999)
M. Guyot, A. Globus, Phys. Stat. Solidi. (b) 52, 427 (1972)
J. Smit, Magnetic Properties of Materials, Inter University Electronics Series (McGraw Hill, New York, 1971)
D.N. Bhosale, N.D. Choudhari, S.R. Sawant, P.P. Bakare, J. Magn. Magn. Mater. 173, 51 (1997)
A. Globus, P. Duplex, IEEE Trans. Magn. Mag. 2, 441 (1966)
A. Globus, P. Duplex, Compt. Rend. Acad. Sci. Paris. 262, 238 (1966)
N. Ramamanohar Reddy, M. Venkata Ramana, G. Rajitha, E. Rajagopal, K.V. Siva Kumar, V.R.K. Murthy, J.Magn. Magn. Mater. 292, 159 (2005)
U.B. Deshmukh, S.M. Kabbur, N.D. Choudhari, S.R. Sawant, S. Suryavanshi, Proceedings of National Conference on Electronic Materials Devices and Systems (NCEMDS-99), Gulbarga, (1999) 231
I. Kanada, T. Murase, T. Nomura, J. Jpn. Sci. Powd. Powd. Metall. 48, 136 (2001)
J. Smit, H.P.J. Wijn, in Ferrites (Philips Technical Library, Eindhoven, 1959)
Acknowledgements
The Defence Research and Development Organization (DRDO) financially supported this work, under the grants ERIP/ER/0103301/M/01, New Delhi, India. The authors acknowledge G. Rajitha, Department of Physics and Prof. A. Varada Rajulu, Department of Polymer Science and Technology, S.K. University, Anantapur for their cooperation and encouragement. The authors are thankful to the authorities of Sri Krishnadevaraya University, Anantapur for providing the facilities.
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Varalaxmi, N., Ramamanohar Reddy, N., Venkata Ramana, M. et al. Stress sensitivity of inductance in NiMgCuZn ferrites and development of a stress insensitive ferrite composition for microinductors. J Mater Sci: Mater Electron 19, 399–405 (2008). https://doi.org/10.1007/s10854-007-9352-z
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DOI: https://doi.org/10.1007/s10854-007-9352-z