Physics – Condensed Matter – Materials Science
Scientific paper
2006-06-22
J. Appl. Phys. 100(4), 044314 (2006)
Physics
Condensed Matter
Materials Science
15 pages with 6 figures included, To J. Appl. Phys
Scientific paper
10.1063/1.2335386
Unusually large low field magetoresistance (LFMR), ~ 10 %, at 300 K has been observed with the sample of mono-dispersed Fe3O4 magnetite nanospheres, ~ 200 nm, compactly cold-pressed and sintered at 800 C. A detailed analysis on the transport and magnetic measurements indicates that the electron conduction is dominated by the spin-dependent scattering or tunneling at the grain boundaries. At low temperature, 140 K and 100 K near the Verwey transition, ~ 115 K, the LFMR (below 2 kOe) does not show any sign of dependence on the transition, and does not follow the variation of magnetization to reach the saturation region either. On the other hand, at 300 K, the MR saturates fast with the magnetization below 2 kOe. This temperature dependent property in LFMR is very likely attributed to the scattering or tunneling of the conduction electron passing through the grain boundary layer with spin disordered state.
Chen Cui-Ping
Deng Houtao
Li Yun-De
Song Yi Ping
Wang Jian-Feng
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