Effect of underlayer microstructure on the exchange coupling of Mumetal-Al oxide-Co multilayer

Author

Young-woo Lee ; Lee, T.H. ; Kim, C.G. ; Kim, C.O. ; Yoon, T.S.

Author_Institution

Dept. of Mater. Eng., Chungnam Nat. Univ., Taejon, South Korea

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2788

Lastpage

2790

Abstract

Exchange coupling of Mumetal(Ni₇₇Fe₁₄Mo₅Cu₄ wt%)-Al oxide-Co multilayers has been investigated as a function of Mumetal growth temperature. As Mumetal growth temperature increases from 20°C to 90°C, grain size and surface roughness increase simultaneously. The increase of grain size diminishes the exchange coupling up to 40°C, and increase of roughness increases exchange coupling after 40°C. It is thought that grain size and roughness of the underlayer are competing factors for the interlayer exchange coupling of the magnetic multilayer.

Keywords

aluminium compounds; cobalt; coercive force; copper alloys; exchange interactions (electron); grain size; iron alloys; magnetic hysteresis; magnetic multilayers; magnetic switching; molybdenum alloys; nickel alloys; sputter deposition; surface topography; 20 to 90 degC; Mumetal growth temperature; Mumetal-Al oxide-Co multilayer; Ni₇₇Fe₁₄Mo₅Cu₄-Al₂O₃-Co; exchange coupling; grain size; interlayer exchange coupling; magnetic hysteresis loops; magnetic multilayer; rf magnetron sputtering; surface roughness; switching field; underlayer microstructure; Atomic force microscopy; Couplings; Grain size; Magnetic materials; Magnetic multilayers; Magnetic tunneling; Microstructure; Nonhomogeneous media; Scanning electron microscopy; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.803116

Filename

1042359