Title of article :
Microstructural and magnetic studies of granular GdW films
Author/Authors :
Shevchenko، نويسنده , , N.B. and Murthy، نويسنده , , A.S. and Hadjipanayis، نويسنده , , G.C.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1995
Abstract :
We have studied the microstructural and magnetic properties of sputtered nanocrystalline granular Gd-W thin films as a function of annealing temperature. Granular Gd-W films were formed by annealing the as-deposited amorphous films in the temperature range 700–950 °C for 15 min. The TEM studies on the annealed samples indicate that the Gd and W phases crystallize as separate phases around 825 °C. The grain sizes of these granular phases were estimated to be about 10–30 nm. Magnetic measurements of samples annealed at 875 °C indicate the coexistence of superparamagnetic Gd with a blocking temperature near 50 K and ferromagnetic Gd with a Curie temperature near 293 K. Higher temperature annealings led to bulk-like ferromagnetic Gd behavior.
Keywords :
Magnetic properties , granular , Gadolinium , Tungsten
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A