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| Sintering Effects on Fe/Mo Ordering and Magnetoresistance in Double Perovskite Sr2FeMoO6 |
| Journal of Magnetics, Volume 9, Number 1, 31 Mar 2004, Pages 9-12 |
J Kim(Department of Physics, Hankuk University of Foreign Studies), B.J Park(Department of Physics, Hankuk University of Foreign Studies), B.W Lee*  (Department of Physics, Hankuk University of Foreign Studies) |
| Abstract |
| We have investigated sintering effects on Fe/Mo ordering and magnetoresistance (MR) in double perovskite-reflection lines due to Sr2FeMoO6(SFMO). Polycrystalline samples have been prepared by the conventional solid-state reaction by sintering in a stream of 5% H2/Ar gas. All samples are single phase and exhibit a series of superstructurecation ordering at Fe and Mo sites. As sintering temperature increases from 900 to 1300℃, the degree of Fe/Mo ordering increases from 82 to 92%, magnetization (15 K, 7 kOe) increases from 1.6 to 2.7 µB/f.u., and Curie temperature increases at a rate of 4.3 K/% with the increase of Fe/Mo ordering ratio. The magnitude of MR measured at 5 K is 19% for sample prepared at 1000℃ with magnetic fields of 7 kOe. The observed MR is proportional to the square of magnetization indicating that the MR feature in SFMO is explained by the spin-polarized tunneling at grain boundaries. |
| Keywords: Double perovskite; Magnetic ordering; Magnetization; Magnetoresistance |
| DOI: |
| Full Text: PDF |
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