We reported the investigation results of the magnetic domains in a Co_(50)Ni_(20)Ga_(30) shape memory alloy with applying a magnetic field by objective lens with the out-of-focus methods of Lorentz microscopy.

• 本文首次通过增加物镜电流对样品施加外加磁场,并利用洛伦茨显微术实时观察了在外加磁场作用下Co50Ni20Ga30合金的磁畴结构的变化。