High frequency initial permeability of NiFe and FeAlN

Author

Jayasekara, W.P. ; Bain, J.A. ; Kryder, M.H.

Author_Institution

Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1438

Lastpage

1440

Abstract

The initial permeability of NiFe single layer films and single and multi-layer FeAlN films up to 500 MHz are presented. The permeability of thin (<1500 Å) NiFe and FeAlN films were fit with calculations based on the Landau-Lifshitz/Gilbert model for phenomenological damping, using damping factors of ~0.016 and ~0.026, respectively. Transverse bias permeability measurements identified larger ripple fields in FeAlN samples compared to those in thin NiFe samples. The permeability of ~2 μm thick NiFe and FeAlN films were well described by eddy current theory. The permeability roll off frequency of 2 μm thick patterned FeAlN films Increased from 20 to 200 MHz when laminated into 32 layers separated by 25 Å thick SiN interlayers

Keywords

aluminium alloys; iron alloys; magnetic multilayers; magnetic permeability; magnetic recording; magnetic thin films; nickel alloys; 1500 angstrom; 500 MHz; FeAlN; Gilbert model; Landau-Lifshitz model; NiFe; SiN interlayers; eddy current theory; high frequency initial permeability; multilayer films; permeability roll off frequency; phenomenological damping; ripple fields; single layer films; transverse bias permeability; Damping; Dielectric measurements; Dielectric substrates; Dielectric thin films; Eddy currents; Frequency; Magnetic field measurement; Permeability measurement; Silicon compounds; Thickness measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706575

Filename

706575