Title :
Ferromagnetic Resonance Study of Annealed NiFe/FeMn/CoFe Trilayers
Author :
Kim, Ki-Yeon ; Choi, Hyeok-Cheol ; Shim, Je-Ho ; Kim, Dong-Hyun ; You, Chun-Yeol ; Lee, Jeong-Soo
Author_Institution :
Neutron Sci. Div., Korea Atomic Energy Res. Inst., Daejeon
fDate :
6/1/2009 12:00:00 AM
Abstract :
The effect of a thermal treatment on the exchange field in 19-nm NiFe(bottom)/15-nm FeMn/19-nm CoFe(top) trilayers has been investigated by employing a vibrating sample magnetometer (VSM) and a ferromagnetic resonance (FMR) spectrometer. FMR spectra as a function of applied dc field reveal that there are two distinct resonance peaks corresponding to each ferromagnetic layer. It is found that exchange fields determined from the in-plane angular dependence of the resonance field are in accord with that determined through the magnetic hysteresis loops for the NiFe/FeMn interface rather than the CoFe/FeMn one. A FMR linewidth broadening as a function of the annealing temperatures is attributed to the interdiffusion between the two magnetic interfaces across a FeMn layer.
Keywords :
annealing; chemical interdiffusion; cobalt alloys; exchange interactions (electron); ferromagnetic materials; ferromagnetic resonance; iron alloys; magnetic hysteresis; magnetic multilayers; magnetometers; manganese alloys; nickel alloys; FMR linewidth broadening; FMR spectra; NiFe-FeMn-CoFe; VSM; angular dependence; annealed trilayers; annealing temperatures; applied dc field; exchange field; ferromagnetic layer; ferromagnetic resonance spectrometer; interdiffusion; magnetic hysteresis loops; magnetic interfaces; size 15 nm; size 19 nm; thermal treatment; vibrating sample magnetometer; Exchange bias; FM/AFM/FM trilayer; ferromagnetic resonance; linewidth broadening; resonance field; thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2020552
