Abstract
The magnetic microstructure of Co50Ni20FeGa29 alloy under a magnetic field applied parallel to the [111] direction has been studied via in situ observation by transmission electron microscopy (TEM). The domain walls formed a sawtooth-like configuration with an initial size of ∼10 micron, which shrank as increase of the applied field strength and finally vanished at the field strength about ∼0.46 T. Number of the walls increased during domain boundary motion driven by the applied magnetic field. A geometrical characteristic feature of the domain walls was unchanged until vanishing under the applied field. Based on in situ observation on reorientation of magnetization, the genetic aspect of these domain walls motion was discussed briefly.
