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Microwave-assisted magnetic recording (MAMR) has recently emerged as a candidate to solve the trilemma in magnetic recording. In this study, the fundamental characteristics of the magnetic fields generated by a field-generating layer (FGL) are investigated using micromagnetic simulations. The relationships between the fields generated by the FGL and magnetic parameters, such as interlayer exchange coupling strength (Aperp) and the anisotropy constant (K), are investigated. In addition, oscillation behaviors are investigated by examining the magnetization configurations of the FGL. A Bloch-line-like magnetic structure is observed in the FGL in the stable oscillation mode. The Bloch-line-like structure functions as a rotation axis. However, it disappears in the unstable oscillation mode.