| Summary: | 碩士 === 國立臺灣海洋大學 === 光電科學研究所 === 105 === Magnetostrictive materials can convert magnetic energy and mechanical energy to each other. They have great potential both in the field of microelectromechanics and in the application of sensing elements. Because of this, it has caused extensive research and discussion. In this paper, I research the magnetic properties, magnetostrictive and mechanical properties in which Fe87-x-Ga13-Tbx (x = 0、0.2、1、2、5) was measured according to the different ratios of Tb.
First of all, materials were cut by line machine to meet the needs of the sample size. Then I made a series of measurement and analysis. At the beginning, the lattice structure was observed with an X-Ray Diffractometer (XRD). Second, I used a Vibrating Sample Magnetometer (VSM) to observe magnetic properties. Third, I used a Magnetic Thermal Gravimetric Analyzer (MTGA) to observe thermal characteristics of the material and to analysis with Curie temperature. Fourth, the Young's modulus (E), shear modulus(G) and damping performance of the material under the magnetic field were analyzed by the Resonant Frequency & Damping Analyzer (RFDA). After that, I used the strain gauge to measure the sample under the action of the magnetic field of the telescopic variable, that is, the amount of magnetostriction. Finally, measuring the permeability and using a four-point probe method to measure resistivity of the sample in order to understand effects if the material is made into a high-frequency element or an electronic component.
By adding and increasing the proportion of Tb , the (HC) of Fe87-x-Ga13-Tbx (x = 0、0.2、1、2、5) material will be raising. It means the magnetic dipole moment is not easy to flip and saturation magnetization (MS) is decreased. In the measurement of MTGA, it can be observed Curie temperature (TC) is increased when Fe87-Ga13 alloy with the adding and increasing the proportion of Tb, which means that the material is not susceptible to temperature effects.
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