The magnetic and magnetoresistance properties of ultrathin magnetite films grown on MgO substrate

Y. Zhou, Ciaran McEvoy, R. Ramos, I. V. Shvets

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We report on the properties of ultrathin (2, 4, 6, and 8 nm) epitaxial films of magnetite, Fe3 O4, grown on MgO (100). Atomic force microscopy image and V-I curves suggest that the films at this thickness are still continuous. The resistivity versus temperature results imply that the conductivity mechanism in all these films is similar. The resistivity of 4 nm thick film is much greater than that of 6 and 8 nm films. The films show ferrimagnetic instead of reported superparamagnetic behavior. The dead layer formed by Mg diffusion between MgO substrate and magnetite films and also the dead layer on the top uncapped film could be the possible reasons for the anomalous resistivity and magnetic properties of the ultrathin films. The effect of the "dead layer" in the thinner film is relatively greater than the one in the thicker film and should lead to a lower magnetoresistance.

Original languageEnglish
Article number08J111
JournalJournal of Applied Physics
Volume99
Issue number8
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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