DocumentCode :
1122963
Title :
Exchange-Coupled IrMn/CoFe Mulitlayers for RF-Integrated Inductors
Author :
Jiang, Ruo-Fan ; Shams, Nazmun N. ; Rahman, M.Tofizur ; Lai, Chih-Huang
Author_Institution :
Nat. Tsing Hua Univ., Hsinchu
Volume :
43
Issue :
10
fYear :
2007
Firstpage :
3930
Lastpage :
3932
Abstract :
The high-frequency characteristics of the RF integrated inductors with antiferromagnetic/ferromagnetic (AF/F) multilayers (MLs) are studied. Each AF layer is 8-nm IrMn and F is Co50Fe50 with a 200-nm splitting into N = 1 to 5 repeats of MLs. This exchange coupled {IrMn/CoFe(d nm)}N MLs are deposited on top of the two-port inductors with five-turn square spiral coils, a dimension of 100 mum times 100 mum and line/space of 5 mum/2 mum. The inductor surface and magnetic layer is separated by 1-mum-thick SiO2. The enhancement of inductance (DeltaL) is 20% compared to an air-core of the same coil size. The resonance peak gradually shifted to a higher frequency with increasing N, and reached at a maximum of 4.3 GHz when N = 5. This is in good agreement with our magnetic data which revealed that the anisotropy field (Hk) and ferromagnetic resonance frequency (fFMR) of {IrMn/CoFe(d nm)}N MLs are increased with increasing N. The quality factor, Q is improved by 6.8% at 1.5 GHz for the {IrMn/CoFe(40 nm)}N=5 integrated inductors compared to air-core inductors.
Keywords :
Q-factor; antiferromagnetic materials; cobalt alloys; copper; exchange interactions (electron); ferromagnetic materials; ferromagnetic resonance; inductors; iridium alloys; iron alloys; magnetic anisotropy; magnetic multilayers; manganese alloys; silicon compounds; tantalum; RF-integrated inductors; SiO2-Ta-Cu-IrMn-CoFe-Ta; antiferromagnetism; exchange-coupled magnetic mulitlayers; ferromagnetic resonance; ferromagnetism; magnetic anisotropy; quality factor; Antiferromagnetic materials; Coils; Inductors; Magnetic anisotropy; Magnetic resonance; Magnetic separation; Multilevel systems; Nonhomogeneous media; Perpendicular magnetic anisotropy; Radio frequency; Antiferromagnetic (AF); exchange coupling; ferromagnetic resonance (FMR); frequency response; radio-frequency (RF) inductor;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2007.892868
Filename :
4303204
Link To Document :
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