Figure 1
Interplay between the grain and cell sizes.
TEM images of the as-deposited amorphous NGST films obtained with a sputtering power of (a) 0.1 and (b) 0.3 kW and the annealed crystalline NGST films with grain sizes of (c) 5 and (d) 9 nm. (e) Schematic diagram showing the higher interface-area-to-volume ratio of cells when both the grain and cell size decreases. (f) Numerical study shows that the ΔNg/Δx increases when both the grain size and cell size reduces. As the cell size falls below 40 nm, the increase in ΔNg/Δx was observed to be faster for the cells with smaller grain sizes. g1and g2, c1 and c2 and h refer to the grain sizes, cell sizes and material thickness, respectively.
