An FMR spectroscopy system has been built that comprises a microprocessor-based signal generator, a PCB-based coplanar waveguide, a diode-based detector to record the absorption peak passing through the samples. A lock-in detection technique is employed for phase information of the modulated signal. By sweeping the DC magnetic field at a certain RF frequency, the 1st derivative of the RF power absorption concerning the applied field is recorded for each of the samples with DAQ-assisted LabVIEW programming through a computer. The recorded data is processed through the Origin-Pro 2023 software, which is approximately matched with the asymmetric Lorentz derivative, which yields the linewidth and the resonance magnetic field corresponding to each of the frequencies. A graph for resonance field against the resonance frequency fits well with the Kittel equation and provides saturated magnetization. For 100nm YIG, the measurement yields the magnetization (𝜇0𝑀𝑠) as (0.7048± 0.2206) T and Gilbert damping constant as α=0.00578± 0.0009, both are much higher than the average experimental value of 0.15T and 0.0007, respectively. For 20nm CoFeB, the measurement provides the magnetization (𝜇0𝑀𝑠) as (3.4735± 0.3075)T and Gilbert damping constant α=0.00924± 0.000537, respectively. Whereas for 4nm CoFeB, the measurement yields the magnetization (𝜇0𝑀𝑠) as (1.8678± 0.00357)T and Gilbert damping constant α=0.00694± 0.0001, respectively. For 20nm CoFeB 𝜇0𝑀𝑠=3.4T is almost double the other’s experimental value of 1.8 T but for 4nm 𝜇0𝑀𝑠=1.8678± 0.00357 T is consistent with the literature value. The Gilbert damping constant assessed for 20nm is a little higher than the literature value, while 4nm is consistent with other's average experimental value of 0.008. To conclude, the experimental setup is working, and it is recommended that the measurements be repeated for further verification.