Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 475, Issue -, Pages 240-248Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2018.11.011
Keywords
Magnetostrictive materials; Domain wall dynamics; Magnetic Barkhausen noise; Stress sensor; Frequency spectrum
Funding
- Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University [17K0076]
- [JP17H03140]
Ask authors/readers for more resources
Magnetic Barkhausen noise (MBN) plays significant roles to describe the dynamic of domain walls (DWs), but an in-depth understanding of the correlation between Barkhausen effect and magnetostrictive effect during magnetization process is still limited. In this study, we investigated MBN signals and the frequency spectra in a high-magnetostrictive Fe30Co70 alloy wire (lambda(s) = 102 ppm) by evaluating the stress effects on MBN profiles at the stress range of 0-150 MPa using tensile test machine. The results from MBN profiles revealed that MBN in the high magnetic field region was responsible for the localized changes of magnetic flux density, dB/dt induced by magnetic distortion related to non-180 degrees DWs or the magnetization rotation. In MBN spectra, the peak shift towards lower frequencies with the increase of stress indicates that the rough pulse-like MBN outbreaks increase, and it results mainly from the increase of DW jumping length which is caused by the pinning effect at grain boundaries where DW energy is relatively high. In addition, stress dependence of the root mean square (RMS) value of MBN showed a good sensitivity (0.038 mV/MPa). Overall, these findings indicate that new MBN measurement system utilizing magnetostrictive materials can be helpful for a wide range of applications such as mechanical stress sensors and energy harvester systems.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available