Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 13, Pages 1933-1938Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2008.12.012
Keywords
Magnetite nanocrystals; Tunneling magnetoresistance; Spin-polarized transport; Superparamagnetism
Funding
- Israel Science foundation [779/06]
- James Frank program
- Levi Eshkol Foundation
- Ministry of Science Culture Sport Israel
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Inter-particle spin-polarized tunneling was measured in an organically capped magnetite nanocrystal (NC) array deposited between 30nm spaced gold electrodes. Magnetoresistance (MR) measurements performed around the blocking temperature (T-b) of the magnetic moments of the particles in the array, which was relatively high (220 K), yielded negative MR values of the order of 10-25% under moderate magnetic fields of several kOe. The field dependence of the MR followed closely the square of the film's magnetization and its voltage dependence indicated maximal spin polarization around the Fermi level. These findings suggested that the measured MR is the result of spin-polarized tunneling between individual magnetite NCs acting as superparamagnetic spin polarizers. (C) 2008 Elsevier B. V. All rights reserved.
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