Figure 4

The influence of Tb₃₀Co₇₀ thickness on the magnetic properties.

(a) The perpendicular coercive field H_c⊥ and exchange coupling field H_ex and (b) remanent net magnetization M_net as a function of Tb₃₀Co₇₀ thickness for samples of [Co0.28/Ni0.58]₅/ Tb₃₀Co₇₀ (t). Insets: Magnetic hysteresis loops for t = 8, 13.5 and 20 nm.