Temperature dependence of the tunneling magnetoresistance and ferromagnetism in Ni 65Cu 35 magnetic tunnel junctions

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Abstract

The temperature dependence of the tunneling magnetoresistance and magnetization have been measured for spin-valve magnetic tunnel junctions in which the pinned magnetic electrodes is a Ni 65Cu 35 alloy with a Curie temperature of roughly 250 K. By extracting the spin polarization of the NiCu electrode using the Julliére formula, it is shown that the tunneling spin-polarization as a function of temperature can be related to the temperature-dependent magnetization. The observed quasi-linear relation between the magnetization and the tunneling spin polarization is consistent with the theoretical picture of predominantly s-electron tunneling with the spin-polarization arising via hybridization with the exchange split 3d band.

Original languageEnglish
Pages (from-to)L1-L4
JournalJournal of the Korean Physical Society
Volume48
Issue number1
StatePublished - Jan 2006

Keywords

  • Magnetic tunnel junctions
  • NiCu alloy film
  • Spin-polarized tunneling
  • Temperature dependence of spin polarization
  • Temperature dependent magnetoresistance

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