Abstract
A numerical simulation of the demagnetization process (hysteresis loop) is performed in order to evaluate the bilinear and biquadratic coupling in the MgO/[Fe/Ag/Fe]/Ag trilayer. The proposed approach is intermediate between the model assuming that the system always reaches the Global Energy Minimum (GEM) and the model considering the situation when the system follows the Local Energy Minimum (LEM). The intermediate approach is realized by defining the energy barrier parameter Eb determining the transition between the local energy minima. The value of Eb can be obtained using reference (uncoupled) samples. The numerical algorithm applied to the GEM, LEM and the intermediate model is described. The bilinear J1 and biquadratic J2 coupling parameters are determined from the ferromagnetic resonance and hysteresis loop measurements.
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