Stable Strain-Induced Magnetic Remanence in Nickel, Cobalt, and Magnetite

Abstract

Three magnetic materials have been deformed at room temperature, and stability aspects of their magnetomechanical behaviour examined. Plastic deformation of nickel and cobalt, and elastic deformation of magnetite, give a strain induced moment. The remanence is larger and much more relatively stable than isothermal remanent magnetization (IRM) from the field applied during deformation. It is also more stable than an IRM with an equal magnitude, and can have a significantly different microscopic coercivity spectrum. The results are consistent with a model for magnetomechanical effects based on the response to changes in the physical structure.