Fig. 2: Static magnetization of Py/Gd multilayer.
a Sketch of the Py/Gd/Py/Gd/Py/Pt sample (the numbers in parentheses are thicknesses in units of nanometers). b Temperature dependence of in-plane magnetization at H = 50 Oe; the green arrow indicates the compensation temperature TM. The positive half branches of the hysteresis loops at (c) T = 300 K, (d) T = 30 K and (e) T = 10 K. The twisted state is achieved at H > Htwist (gray dotted lines in d, e), while the Gd-aligned phase is retained at H < Htwist at T = 30 K and 10 K. At T = 300 K, only the Py-aligned phase is achievable within the H range in our experiments. The Py-aligned phase, twisted state and Gd-aligned phase are illustrated in c–e. The perfect antiparallel alignment of MPy and MGd is ensured in the Py-aligned phase and Gd-aligned phase.
