Magnetic properties of hot-pressed multilayer Ni/Cu composites have been studied by magnetometry and visualization of the induction distribution using yttrium-iron garnet indicator films with planar anisotropy. It was found that the memory of the nickel foil rolling direction is preserved in the composite despite the annealing procedure at a temperature of about 1000°C for 2 h under a pressure of 10 MPa and subsequent slow cooling under the pressure. The anisotropy of the grain shape caused by rolling is shown. In the transverse direction to the rolling, an abnormal increase in magnetic permeability was detected with a decrease in temperature and a normal decrease in longitudinal permeability. It is shown that the magnetization loops differ significantly along and across rolling directions despite of almost constant coercivity. The transverse hysteresis loops go twice steeper in the initial linear section than the longitudinal ones. However, as the temperature decreases, the transverse hysteresis loops become steeper, while the longitudinal loops become less steep. The mechanisms responsible for the observed transformation of properties are discussed.
Evstigneev et al. (Mon,) studied this question.