Characterization of a nano-oxide layer in a pseudo spin valve by complex magneto-Impedance spectroscopy

W. C. Chien, C. K. Lo

Research output: Contribution to journalArticlepeer-review

Abstract

The ac properties of a pseudo spin valve (PSV) consisting of NOLtop/Co/Cu/Co/Ni80Fe20/NOLbottom with a top and bottom nano-oxide layer (NOL) were studied as functions of NOL and thickness, d, by magneto impedance spectroscopy. The NOLs were formed by natural oxidizing the top and bottom ferromagnetic or Ta layers in situ. The increase in the thickness of NOL resulting in the increment of effective capacitance caused the shift of roll-off frequency from low to high. The frequency dependence behavior of this NOLtop/PSV/NOLbottom system can be modeled by equivalent circuit theory. PSV with a different NOL structure can be checked by such a nondestructive analysis method.

Original languageEnglish
Pages (from-to)2624-2626
Number of pages3
JournalIEEE Transactions on Magnetics
Volume42
Issue number10
DOIs
Publication statusPublished - 2006 Oct
Externally publishedYes

Keywords

  • Magneto-capacitance
  • magneto-impedance
  • nano-oxide layer
  • pseudo spin valve
  • roll-off frequency

ASJC Scopus subject areas

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

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