Activation Energy of Interdiffiision and Interface Structure for CoFc/Cu Spin-valves

A. T. Saito, I. L. Iwasaki, Y. Kamiguchi, Fuke, M. Sahashi

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Annealing time and temperature dependences of MR ratio in CoFe/Cu spin-valves were investigated. Thermal deterioration of MR ratio was well explained by considering two phenomena with effective activation energies of 2.16 eV and 1.57 eV for CoZrNb/NiFe/CoFe/Cu/CoFe/FeMn spin-valves, and considering one phenomenon with a value of 2.49 eV for CoZrNb/NiFe/CoFe/Cu/CoFe/IrMn spin-valves, respectively. These values are in good agreement with activation energies of interdiffusion based on the vacancy mechanism. It is shown that no significant change in MR ratio is evaluated from the effective activation energies for the period of more than 10 years at 150°C in CoZrNb/NiFe/CoFe/Cu/CoFe/IrMn spin-valve films.

Original languageEnglish
Pages (from-to)1420-1422
Number of pages3
JournalIEEE Transactions on Magnetics
Volume34
Issue number4 PART 1
DOIs
Publication statusPublished - 1998 Dec 1

Keywords

  • Activation energy
  • Cofe/cu spin-valve
  • Interdiffusion
  • Thermal stability
  • Vacancy mechanism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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