(color online) The recoil loops with maximum openness of (a) the single-phase magnet with L = 20 nm and (b) the nanocomposite magnet with L = 20 nm and t = 3 nm. The insets shown in the third quadrant are the 3D model of single-phase and hard-soft phase nanocomposite magnets. The insets in the right side give the magnetization distributions at different magnetic history, i.e., upper and lower branches of recoil loop under field . The color red and blue in the distributions represent the magnetic moments with deviation to up and down, respectively. To illustrate the magnetization distributions clearly, the slice plane of only four grains was selected instead of the whole sample.^[267]