Detection of an Infrared Magnetorefractive Effect From a Layered Fe/MgO/Fe Magnetic Tunnel junction

R. T. Mennicke, R. Berryman, J. A. D. Matthew, S. M. Thompson, K. Yakushiji, F. Ernult, S. Mitani, K. Takanashi

Research output: Contribution to journalArticlepeer-review


The magnetorefractive effect (MRE) has become an established technique for the contactless measurement of giant and colossal magnetoresistance and has also been extended to the study of thick granular tunnelling films. Here, the MRE is used to study the behaviour of a MgO(100)/MgO(20 nm)/Fe(20 nm)/MgO(1.5 nm)/Fe(5 nm)/Co(3 nm)/Au(3 nm) magnetic tunnel junction patterned into square pillars of lateral dimension: 50 pm and 5 mu m. A significant MRE is observed, enhanced by the presence of an absorption edge associated with MgO, although the exact origin of the effect is unclear.

Original languageEnglish
Pages (from-to)2566-2568
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - Nov 2008


  • Infrared
  • magnetoresistance
  • tunnelling

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