Because the anomalous Nernst effect (ANE) involves the effective electric field generated by the combination
between the thermal gradient and the magnetization direction, it has been well applied to not only the measurement
of the static magnetization but also the experiment for the low frequency magnetization dynamics. In this
work, the frequency response of the ANE was examined to provide two implications: First, as a method to separate
Nernst effects from other signals in the homodyne or heterodyne method, and second, as a timing reference
to the phase-sensitive magnetization dynamics. The intensity of 1550 nm laser power was modulated up to
2.4 GHz and successfully produced the equivalent speed of the ANE signals from the 10 nm Permalloy block on
the sapphire substrate. The implications could be supported, when the detection system consists of welldesigned
radio frequency components and the better heat sink substrate to get the faster thermal gradient on
the magnets.