| Abstract: | A theoretical investigation of the effect of mechanical stresses on the remanent magnetization has been performed in terms
of the model of single-domain noninteracting nanoparticles. Relationships have been obtained which define two main types of
remanence in the entire range of stresses. In the low-field approximation, the magnetization of the first type, whose mechanism
of formation is similar to that of the normal remanence, is quadratic in both the magnetic field and stresses and only slightly
changes with increasing stresses. Depending on the relationship between the magnetostriction constants, this magnetization
can both increase and decrease with increasing stresses. The magnetization of the second type, which arises as a result of
a nonmonotonic behavior of the critical fields of nanoparticles depending on mechanical stresses, is proportional to the magnetic
field and mechanical stresses. It has been shown that the longitudinal remanence arising in the field of stresses parallel
to the magnetic field is always greater than the transverse remanence. The behavior of the remanence with increasing mechanical
stresses depends substantially on whether this magnetization is formed in a loaded state or in a state unloaded after plastic
deformation. In the range of deformations where the anisotropy of the applied stresses is less than the magnetocrystalline
anisotropy, the plastic tension should lead to a decrease in the magnetization as compared to that arising in the plastically
undeformed state. Plastic compression can lead to both an increase and a decrease in the remanence. |
