Abstract
With less extra stress on the testing sample, a free-stress sample holder was designed to place the sample horizontally. With the free-stress sample holder, a magnetoelectric (ME) coefficient measurement system was developed based on dynamic method. This measurement system has the hardware part and the software part, integrated by the DC magnetic field generation module, the AC magnetic field generation module, the induced ME voltage detecting module and PC software module. Then, a sample of Terfenol-D/PZT/Terfenol-D trilayer was designed and fabricated, and the relationships of its ME coefficient influenced by the DC magnetic field and the frequency of the AC magnetic field were tested using the measurement system. And the results showed that the free-stress sample holder was proven to improve the accuracy of the measurement system by less stress interference.
Highlights
In magnetoelectric (ME) composites, electric field can control its magnetic properties and magnetic field can control its electric properties
With the free-stress sample holder, a magnetoelectric (ME) coefficient measurement system was developed based on dynamic method
The results showed that the free-stress sample holder was proven to improve the accuracy of the measurement system by less stress interference
Summary
In magnetoelectric (ME) composites, electric field can control its magnetic properties and magnetic field can control its electric properties. In the ME composite, the ME effect arises from the magnetostrictive and piezoelectric constituents via interfacial strain [7]. When the ME coefficient is being tested by the ME coefficient measurement system, any extra stress, not from the ME effect, will affect the testing results. A little additional stress from the sample holder clamping can increase the error of the testing results, especially it cannot insure the stress from the sample holder clamping always keeping the same value. The ME coefficient measurement system was developed to design a free-stress sample holder to avoid additional stress. Compared with in other clamping ways, the free-stress sample holder is demonstrated to be with less errors
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