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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Nayak, B.B. Mondal, A. Vitta, S. Bahadur, D. |
| Copyright Year | 1965 |
| Abstract | Composites of (1-x)M LCMO: xM NiFe2O4 (where M is molecular weight and x = 0, 0.01, 0.02, 0.05, 0.10, 0.15, 0.50 and 1) were prepared by precipitation route using microwave oven and sintered at 1200 °C to understand the effect of NiFe2O4 addition on the structure, transport and magnetic properties of La-Ca-manganite. A structural transition from monoclinic LCMO (x ≤ 0.10 M, space group I 2/a) to orthorhombic LCMO ( x ≥ 0.15 M, space group P n m a) was observed with increasing NiFe2O4 concentration. The presence of two insulator-metal (TMI) transition at 245 and 210 K for x = 0, and at 245 K and 165 K for x = 0.01 M composite in ρ versus temperature curve was due to the intergrain scattering and presence of microscopic inhomogeneities, respectively. The TMI suppressed to 87 K for x = 0.02 M, while composites with NiFe2O4 ≥ 0.05 M, do not show any transition and exhibit a semiconducting/insulating behavior. Magnetoresistance (MR) was found to be nearly 18% at TMI for x = 0 and x = 0.01 M composite. The Curie temperature (Tc) of LCMO decreases from 240 to 120 K with NiFe2O4 addition up to x = 0.15 M. There was a transition from hard (0.05 M ≤ x ≤ 0.15 M) to soft ( x >; 0.15 M) ferromagnetic behavior with increasing NiFe2O4 concentration. Magnetic coercivity (Hc) as high as 640 Oe was obtained in 0.85 M LCMO: 0.15 M NiFe2O4 composite. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 2728 |
| Ending Page | 2731 |
| Page Count | 4 |
| File Size | 498566 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 47 |
| Issue Number | 10 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-10-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Noise measurement Magnetic properties Ferrites Nanocomposites Grain boundaries Temperature Coercive force magnetic materials Colossal magnetoresistance (CMR) composite materials ferrites magnetic hysteresis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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