Terahertz (THz) magnetization dynamics is a key property of antiferromagnets and ferrimagnets that could harness the THz forefront and spintronics. While most of the present THz measurement techniques are for bulk materials, the sensitivities of which rely on the volume of material, measurement techniques suitable for thin films are quite limited. In this study, we explore and demonstrate the electrical detection of the antiferromagnetic dynamics in ferrimagnetic $\mathrm{Gd}$-$\mathrm{Co}$ thin films by using a 154-GHz gyrotron, which is a high-power electromagnetic wave source. Captured resonant modes allow us to characterize the peculiar magnetization dynamics of $\mathrm{Gd}$-$\mathrm{Co}$ around the net angular momentum compensation. As the gyrotron frequency is scalable up to THz, our demonstration is a milestone toward THz measurements for antiferro- and ferrimagnetic thin films.

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• Antiferromagnetism
• Metrology
• Spintronics
• Ultrafast magnetization dynamics
• Ferrimagnets
• Multilayer thin films
• Ferromagnetic resonance
• Terahertz techniques