Abstract
Electric field control of magnetism in metallic ferromagnets continues to receive close scrutiny for ultralow-energy spintronic devices. This study uses thermally excited ferromagnetic resonance to investigate the electric field effect on sub-100-nm magnetic tunnel junctions. The characteristic appearance of saturation magnetization, exchange-stiffness constant, and uniaxial perpendicular magnetic anisotropy in the mode-frequency splitting provides an effective means to selectively analyze the electric field effect on the exchange-stiffness constant. This insight is useful for controlling domain size, ${T}_{C}$, and other magnetic properties with an electric field.
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