Influence of Thickness on Magnetic Properties and Microwave Characteristics of NiFe/IrMn/NiFe Trilayers

Author

Feng Xu ; Zhiqin Liao ; Qijun Huang ; Phuoc, Nguyen N. ; Chong Kim Ong ; Shandong Li

Author_Institution

Sch. of Mater. Sci. & Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China

Volume

47

Issue

10

fYear

2011

Firstpage

3486

Lastpage

3489

Abstract

Exchange-bias effect is effective in in creasing the ferromagnetic resonance frequency of soft magnetic thin films. This paper studies the static magnetic properties and microwave characteristics of Ni₈₁Fe₁₉/Ir₂₅Mn₇₅/Ni₈₁Fe₁₉ trilayers with various Ni₈₁Fe₁₉ and Ir₂₅Mn₇₅ thicknesses. With an ultrathin Ir₂₅Mn₇₅ interlayer, the trilayer has an enhanced effective damping without exchange-bias effect. The exchange-bias effect is observed with a thicker Ir₂₅Mn₇₅ interlayer. The two resonance frequencies in permeability spectra are due to the different interfacial exchange couplings at the two interfaces of trilayers, and they increase with decreasing Ni₈₁Fe₁₉ layer thickness.

Keywords

damping; exchange interactions (electron); ferromagnetic materials; ferromagnetic resonance; iridium alloys; iron alloys; magnetic multilayers; magnetic permeability; magnetic thin films; manganese alloys; nickel alloys; soft magnetic materials; Ni₈₁Fe₁₉-Ir₂₅Mn₇₅-Ni₈₁Fe₁₉; damping; exchange-bias effect; ferromagnetic resonance frequency; microwave property; resonance permeability spectra; soft magnetic thin films; static magnetic properties; trilayers; Frequency modulation; Magnetic resonance; Permeability; Perpendicular magnetic anisotropy; Soft magnetic materials; Exchange bias; permeability spectra; soft magnetic thin film;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2159486

Filename

6028232