Characterization of a Nano-Oxide Layer in a Pseudo Spin Valve by Complex Magneto-Impedance Spectroscopy

Author

Chien, W.C. ; Peng, T.Y. ; Hsieh, L.C. ; Lo, C.K. ; Yao, Y.D.

Author_Institution

Dept. of Phys., Nat. Chung Cheng Univ., Chia-Yi

Volume

42

Issue

10

fYear

2006

Firstpage

2624

Lastpage

2626

Abstract

The ac properties of a pseudo spin valve (PSV) consisting of NOL _top/Co/Cu/Co/Ni₈₀Fe₂₀/NOL_bottom 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 NOL_top/PSV/NOL_bottom system can be modeled by equivalent circuit theory. PSV with a different NOL structure can be checked by such a nondestructive analysis method

Keywords

cobalt alloys; copper alloys; iron compounds; magnetoresistance; nanotechnology; nickel compounds; spin valves; Co-Cu-Co-Ni₈₀Fe₂₀; equivalent circuit theory; magneto-capacitance; magneto-impedance spectroscopy; nano-oxide layer characterization; natural oxidation; nondestructive analysis method; pseudo spin valve; roll-off frequency; Capacitance; Electrochemical impedance spectroscopy; Equivalent circuits; Frequency; Iron; Magnetic analysis; Magnetic films; Magnetic tunneling; Physics; Spin valves; Magneto-capacitance; magneto-impedance; nano-oxide layer; pseudo spin valve; roll-off frequency;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.879730

Filename

1704385