Abstract
Sub-gigahertz ferromagnetic resonance (FMR) is investigated in a magnetic tunnel junction (MTJ) with small anisotropy fields. Distinct FMR spectra down to 0.36 GHz are obtained by applying an external field that cancels out the anisotropy. A macrospin model simulation reveals that the difficulty in obtaining a smaller frequency excitation is not due to a magnetization inhomogeneity mainly attributed to domain creation but to a nonlinear thermal effect. The results indicate that anisotropy engineering through interfacial magnetic anisotropy together with voltage control will assist in realizing MTJs for low-frequency spin-torque devices.
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