期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 320, 期 3-4, 页码 227-230出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.05.023
关键词
magnetoresistance; manganese ferrite; spin-dependent tunneling
The low-field magnetoresistance ( MR) has been investigated on the ferrite MnFe2O4 nanoparticle compact. At 300 K, a relatively large MR of 6% has been observed in an applied field of 5 kOe. With temperature decreasing, the MR ratio increases to a maximum of 12% at 100 K. These large MR are likely attributed to the spin-polarized tunneling of conducting electrons through the grain boundaries. The rapid drop of MR below 100K reveals that there is a spin glass transition in this kind of compound. (C) 2007 Elsevier B.V. All rights reserved.
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