Title :
Interlayer exchange coupling observed by MOKE in GdxCo 1-x/Gdx/Co1-x´ amorphous bilayers
Author :
Morales, R. ; Alameda, J.M.
Author_Institution :
Dept. de Fisica, Oviedo Univ., Spain
fDate :
7/1/2001 12:00:00 AM
Abstract :
The magnetic behavior of single layers and bilayers of ferrimagnetic amorphous GdxCo1-x (0.38>x>0.21), where the thickness of the individual layer was 100 nm, was analyzed by bulk magnetometry (VSM, AGM) and transverse Kerr effect (TMOKE) in the temperature range of 10 K-300 K. The compensation temperatures were: Tcomp>300 K and Tcomp=230 K for x>0.23 and x=0.21, respectively. For Gd0.21Co0.79 /Gd0.38Co0.62 bilayers, the strong Co-Co exchange coupling at the interface gives rise to a macroscopic ferrimagnet behavior for the net magnetizations of the bilayer when T>230 K. Otherwise, reversible coherent rotation of the magnetization was observed when the field is applied perpendicular to the as-grown in-plane uniaxial easy axis of the bilayer
Keywords :
Kerr magneto-optical effect; amorphous magnetic materials; cobalt alloys; exchange interactions (electron); ferrimagnetic materials; gadolinium alloys; magnetic multilayers; magnetometers; 10 to 300 K; 100 nm; GdCo-GdCo; MOKE; amorphous bilayers; bulk magnetometry; compensation temperatures; ferrimagnetic amorphous material; interlayer exchange coupling; macroscopic ferrimagnet behavior; reversible coherent rotation; transverse Kerr effect; Amorphous magnetic materials; Amorphous materials; Magnetic anisotropy; Magnetic domain walls; Magnetic domains; Magnetic field measurement; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
