The reductive passivation of granular interface was proposed to enhance the tunneling magnetoresistance of bulk granular magnetite. For this, an annealing in paraffin wax has been applied. As a result, the low-field magnetoresistance response was increased up to 8% at 300 K and 32% at 130 K. The effect is attributed to the passivation-induced depletion of density of the tunneling-active spin-depolarized interface states. The obtained results indicate the important role of interface states in tunneling contacts with magnetite electrodes and suggest a way to control these states. © 2005 American Institute of Physics.
Rybchenko, S. I., Fujishiro, Y., Takagi, H., & Awano, M. (2006). Effect of interface passivation on the magnetoresistance of granular magnetite Fe3(1-δ)O4. Applied physics letters, 89(13), Article 132509. https://doi.org/10.1063/1.2357581