Aspect ratio = 4 BaFe+ 40 nm Hc(Tape) = 2000 - 5000 Oe, ... N-MOSFET Digit line (Easy axis) N-MOSFET N-MOSFET Bit line (Hard axis) Word line (For reading) 1MTJ and 1 ...
Therefore the ratio \$\frac{W}{L}\$ is the transistor design variable. Neamen goes on to say that the design variable is used to design MOSFETS to produce specific current-voltage characteristics in MOSFET circuits. EDIT: Yes w refers to width and L to length. It relates to the geometry of the semiconductor.