Irreversible magnetic processes under biaxial and uniaxial magnetic anisotropies

Abstract

Irreversible magnetic processes have been investigated in magnetic systems with two different anisotropy symmetries (uniaxial and biaxial) through angular measurement of the switching field, the irreversible susceptibility and the magnetic viscosity. These two systems consist of two-dimensional cobalt ferrite hetero-structures epitaxially grown on (100) and (110) MgO substrate. It is found that for uniaxial anisotropy the irreversible characteristics of the magnetization are large and display a strong angular dependence, which exhibits its maximum at the easy axis and drops quickly to vanish at the hard axis. However, for biaxial anisotropy the magnetization irreversible characteristics are considerably reduced and are less sensitive to the field angle.

Remarkably enhanced current-driven 360° domain wall motion in nanostripe by tuning in-plane biaxial anisotropy

“…Though previous work mainly focuses on the theoretical simulation, we notice that materials with a biaxial anisotropy have already been realized experimentally, examples ranges from CoFe 2 O 4 films on (100) MgO substrates 34 to Fe films on BaTiO 3 substrates 35 . 360DW on those materials as well as related applications may need further study.…”

“…Recently, there are intriguing experimental progresses on biaxial anisotropy materials 34 , 35 . It is known such a magnetic anisotropy plays a crucial role in domain-wall formation as well as propagation.…”