Abstract Background/ Objectives and Goals The ultrasonic waves can be generated based on various principles such as piezoelectric and magnetostriction But magnetostrictive transducers can generate more powerful sound The core of these transducers is made of some materials such as nickel, Terfenol etc Nickel can be used in low frequency and high power applications, but have relatively week magnetostrictive effect Various parameters affect the behavior and performance of magnetostrictive transducers such as core geometry Methods At first, the core geometry was considered as the main independent variable Some core geometries made of nickel with the same volumes and lengths were numerically investigated using JMAG Designer software, while some parameters including wire type, wire cross sectional area, wire length, coil resistance, etc were constant Followed by, the other relevant parameters including electrical current, frequency, the number of coil turns, and lamination factor were applied to the optimal core geometry for analyzing the ultrasonic wave propagation along the longitudinal and the radial direction of the transducer For evaluating the performance of this transducer, a comparison between the sound pressure calculated in the simulation environment of JMAG Designer software and the sound pressure produced in the real transducer was performed Expected Results/ Conclusion/ Contribution According to numerical simulation results achieved from JMAG Designer software, a conical core with a cone angle of 30 and low operating frequency has the highest variations of magnetostrictive force in the axial direction It was also tried to improve its ultrasonic performance by proper selection of lamination factor along the radial axis Moreover, the nickel particles of core were thermally treated to reduce the maximum output magnetic hysteresis and decreases the maximum input magnetic hysteresis The experimental result showed that the real model is well consistent with the computer model With further investigations, this transducer can be used in some biomaterials processing operations

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