Figure 5
Scaling the in-plane dimension of the elliptical CoFeB.
(a) The critical magnitude of pieostrain pulse (εcr) for enabling magnetization reversal and thermal stability factor as a function of the in-plane dimension of the CoFeB nanomagnets. The aspect ratio r = (short-axis length)/(long-axis length). The 4-nm-thickess remains unchanged. Surface magnetization distributions (top view) of the CoFeB nanomagnets with the same aspect ratio but different in-plane dimensions: (b) 60 nm × 54 nm; and (c) 210 nm × 189 nm. The arrows and the background color (see the color wheel) both represent the orientations of local magnetization vectors.
