Abstract
Barkhausen noise emission in soft magnetic bilayer ribbons has been investigated. The monolithic amorphous Fe73.5Nb3Si13.5B9Cu1/Fe74.5Nb3Si13.5B9 bilayer system was produced by double-nozzle melt-spinning. It was subsequently used to measure the Barkhausen noise emission in the amorphous state as well as in the annealed state as a function of magnetizing voltage. The asymmetry of the Barkhausen noise emission during cyclic magnetization was also investigated. It was found that the amorphous ribbon produces the conventional single burst, whereas the annealed ribbon emits bursts in which Barkhausen noise originating from the different layers can be easily distinguished. Moreover, a gentle asymmetry in the consecutive Barkhausen noise envelopes produced by ascending and descending magnetic fields was detected. The hysteresis loop for the annealed ribbon exhibits a two-step magnetization process in which the contribution of the different layers can be clearly distinguished.
Highlights
Magnetic Barkhausen noise (MBN) occurs during cyclic magnetization of ferromagnetic bodies as a result of discontinuous and irreversible domain wall (DW) motion.1–3 DWs emit electromagnetic as well as acoustic pulses, which can be detected on the free surface
● MBN emission originating from the amorphous ribbon occurs in the form of a single burst, whereas the annealed ribbon produces two separated bursts
● MBN pulses of lower magnitude are detected at lower magnetic fields as compared with those for the harder layer
Summary
Magnetic Barkhausen noise (MBN) occurs during cyclic magnetization of ferromagnetic bodies as a result of discontinuous and irreversible domain wall (DW) motion. DWs emit electromagnetic as well as acoustic pulses, which can be detected on the free surface. Magnetic Barkhausen noise (MBN) occurs during cyclic magnetization of ferromagnetic bodies as a result of discontinuous and irreversible domain wall (DW) motion.. DWs emit electromagnetic as well as acoustic pulses, which can be detected on the free surface. The highest intensity MBN is usually detected near the coercive force in the form of MBN bursts. Two consecutive bursts represent one magnetization cycle through the hysteresis loop. MBN envelopes and the corresponding extracted MBN features during ascending and descending magnetic fields are usually symmetric. In some cases, a marked asymmetry between positive (associated with the ascending magnetic field) and negative (associated with the descending magnetic field) bursts can be found despite demagnetization of the samples prior to the measurement
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
