Effects of magnetic frequency and the coupled magnetic-mechanical loading on a ferromagnetic shape memory alloy

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Original languageEnglish
Article number155301
Journal / PublicationJournal of Physics D: Applied Physics
Issue number15
Online published29 Jan 2021
Publication statusPublished - 15 Apr 2021


In the present work, the microstructure evolution and macro-response of a ferromagnetic shape memory alloy under stimuli of magnetic fields with different frequency and coupled magnetic-mechanical loading are investigated via a real-space phase field simulation. It is found that the coercive field is reduced from 0.724 to 0.423 with the magnetic frequency ƒ decrease from 2.5 × 10-5 Hz to 0.833 × 10-5 Hz, wherein the concomitant domain wall motion and magnetization rotation are captured as well. Moreover, simulation results demonstrate that, under the coupled magnetic-mechanical loading, the coercive field of the magnetic hysteresis loop could be reduced by applying a compressive strain perpendicular to the magnetic field direction. The domain evolution is mainly divided into three types during the coupled magnetic-mechanical loading, namely (a) domain wall motion with the magnetization rotation, (b) pure magnetization rotation, and (c) 180° domain coordinated domain switching. To better understand the domain evolution, we propose an index S = |m1avg|+|m2avg|, with |m1avg| and |m2avg| indicating the absolute value of the averaged magnetization component m1 and m2 over the whole studied system, to characterize the magnetization change during the microstructure evolution.

Research Area(s)

  • Ferromagnetic shape memory alloy, Magnetic frequency, Mechanical-magnetic coupling loading, Phase field simulation