Effect of Low-Frequency Alternative-Current Magnetic Susceptibility in Ni₈₀Fe₂₀ Thin Films

Table 1

Maximum alternative-current magnetic susceptibility and optimal frequency at various thicknesses and temperatures.

NiFe thickness	Room temperature of maximum 𝜒ac	Post-annealed 150°C-1 hr of maximum 𝜒ac	Post-annealed 250°C-1 hr of maximum 𝜒ac	Highest 𝜒ac corresponding optimal resonance frequency 𝑓res (Hz)
300 Å	0.172299	0.212215	0.85171	30 Hz
500 Å	0.661307	2.148086	2.456315	250 Hz
700 Å	1.194991	2.344501	2.541269	250 Hz
1000 Å	1.360231	2.668716	3.456921	500 Hz