Credit: Adapted from A. Berger et al. [14]

Figure 1: (a) Magnetization hysteresis loops of a $Co(4Å)/Pt(7Å)$ multilayer with eight repeats. The heavy line represents the major loop, while the multiple light lines represent the minor loops acquired between $±290Oe$. (b) Kerr microscopy images ($150×150μm$) of a $Co(4Å)/Pt(7Å)$ multilayer with eight repeats, during four successive field cycles. The images were acquired in the negative remnant state.