Title :
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
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2159486
