The influence of interfacial roughness on the coherence of structure and magnetic coupling across barriers in Fe/MgO multilayers

R. Fan, S. J. Lee, J. P. Goff, R. C.C. Ward, S. G. Wang, A. Kohn, C. Wang, A. R. Wildes, S. P. Collins

Research output: Contribution to journalArticlepeer-review

Abstract

Single-crystal Fe/MgO multilayers are model systems in which to study magnetic tunnel junctions. We find that the interfacial roughness leads to the loss of coherence of the crystal structure. For thick MgO layers ferromagnetic (FM) ordering is found using polarized neutron reflectivity (PNR). For thin MgO layers magnetization measurements reveal the presence of antiferromagnetic (AF) interactions, but no long-range AF order is found using PNR. After cycling in a hysteresis loop, FM correlations are found at the coercive point, and this will limit the maximum tunnelling magnetoresistance.

Original languageEnglish
Article number226004
JournalJournal of Physics Condensed Matter
Volume22
Issue number22
DOIs
StatePublished - 20 May 2010
Externally publishedYes

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