Figure 3
Dynamic coercivity as a function of magnetic field with varying amplitude and frequency.
(a) Dynamic coercivities of t-CoFeB and b-CoFeB layers at a fixed frequency of 50 Hz. (b) Dynamic coercivities at a fixed amplitude of H0 = 200 Oe. The external magnetic field is applied perpendicular to the film plane. The dynamic coercivities are extracted from a series of dynamic hysteresis loops of t-CoFeB and b-CoFeB films, which are measured at the temperature of 100, 200 and 300 K by a MOKE system.
