Combining the low divergence of the 4th light source, twin EPUs, chopper modulation and lock-in amplification, high-sensitivity XMCD measurements are achieved. Using ultra-small beam spot down to 3 micrometers with KB mirrors and ferromagnetic resonance technology, XFMR measurements with a phase time resolution of 5 ps are realized. Utilizing a dual-layer cooling system (liquid nitrogen coil shield + thermo-insulation shield + liquid helium), PEEM measurements are performed in a liquid helium temperature (20 K) with a spatial resolution of ~20 nm.