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We have investigated structure, magnetic and dielectric of La 0.5 Sr 0.5 Fe 0.9 Mn 0.05 Ti 0.05 O 3  (LSFMTO) system using ultrasonic mixing method. LSFMTO system is driven by 40 kHz frequency and calcinate process up to 750°C for 30 minutes. Then sintering process also carried out by systematic various of temperature 900 °C, 1000 °C, and 1100 °C respectively, as same time previously. Very interestingly, the LSFMTO system exhibits ferroelectric (La,Sr)(Fe,Mn,Ti)O 3  and ferromagnetic SrFe 12 0 19  properties and minor phase La 2 O 3  by XRD interpretation analyzation. We have also carried out the measurement of LSFMTO system using a systematic applied the external magnetic field from 0 to 1 T and the electric polarization from 0 to 50 kV/m . The hysteresis curve of LSFMTO system shows the electricty coercive (Ec) increases while the saturation polarization (Pc) and the remanent polarization are tendency constant at the magnetic strength of 0.12 T. We believed that our finding of LSFMTO system is potensial to multiferroic material as magnetic sensor application.

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Effects of sintering temperature on structure, magnetic and dielectric properties of La0.5Sr0.5Fe0.9Mn0.05Ti0.05O3 material