Calculation of complex permeability and permittivity on Lanthanum barium manganite materials at X-band frequency

The synthesis and electromagnetic wave absorbing characterization of La_1-yBa_yMnO₃ (y = 0-1, 0) magnetic material through a mechanical milling process have been performed. The La_1-yBa_yMnO₃ (y = 0-1, 0) magnetic material was made from La₂O₃, BaCO₃, dan MnCO₃ materials. The mix was milled for 10 hours and then sintered at 1000°C for 10 hours. The results of the the hysteresis curve indicated that that La_1-yBa_yMnO₃ (y = 0-1, 0) samples are anti-ferromagnetic, and after a barium ion substituted system, this material undergoes a magnetic phase transformation becomes ferromagnetic. At y = 0, the characteristic impedance as a function of frequency is worth more than 2000 ohms, and when y = 0.2, Z characteristics began to change falls below 2000 ohms. Test results obtained by absorption of microwaves that have occurred absorption of electromagnetic waves in the frequency range between 9-15 GHz, frequency absorption peak is ~7 dB at 14.4 GHz. At the peak frequency of the electromagnetic wave absorption were calculated magnitude reaches 50% with a thickness of 1.5 mm. We concluded that the La_1-yBa_yMnO₃ (y = 0-1,0) magnetic material has been made successfully and able to absorb a microwave in the frequency range 9-15 GHz.