Magnetic Anisotropy In Amorphous Ribbons Research Articles

The domain structure and magnetic anisotropy in Co-based amorphous ribbons after annealing in a helical magnetic field: Part II

The interaction of stray fields and the eddy currents inherent in a sandwich domain structure is studied. This interaction allows us to control the existence of a sandwich domain structure in an amorphous ribbon. The formation of non-uniform magnetic anisotropy in an amorphous ribbon as a result of its annealing in a helical magnetic field is also investigated.

Induced magnetic anisotropy in amorphous ribbons by applying a magnetic field during the quenching process

A method to induce magnetic anisotropy in amorphous magnetic ribbons has been developed. The anisotropy is induced in the high Curie temperature Fe80B20 and Co70Mn5Fe1Mo1Si14B9 amorphous magnetic ribbons by applying a magnetic field at the moment of the solidification of the melt. This method does not affect the excellent mechanical properties of these materials. The induced magnetic anisotropy has been measured by torque magnetometry and its strength and easy axis are compared with the results obtained by other authors using static magnetic annealing in similar samples.

Analysis of the in-plane magnetic anisotropy in amorphous ribbons obtained by torque magnetometry

The evolutions of the uniaxial torque and magnetization with the applied magnetic field allow us to discriminate the sources of in-plane magnetic anisotropy in amorphous ribbons. In order to determine the magnetic anisotropy sources, a simple model has been developed for an inhomogeneous material. We apply this model to explain the quite different behavior observed in the evolution of the uniaxial torque amplitude with the applied magnetic field of two commercial Co-based amorphous alloys.

The magnetizing mechanism of the amorphous ribbons with the helical magnetic anisotropy

A helical magnetic anisotropy in amorphous ribbon has been induced by annealing in helical magnetic field. The ribbon magnetizing with the help of large Barkhausen jump in the ‘sandwich structure’ model is realised by the appearing two domain walls near the middle of the ribbon and their next movement to the opposite ribbon surfaces. The domain wall velocity near the middle of the ribbon is higher by an order of magnitude than near the ribbon surface.

“Giant” ΔE-Effect and Magnetomechanical Damping in Amorphous Ferromagnetic Ribbons

The influence of the magnetic field and the strain amplitude on the “giant” ΔE-effect and associated magnetomechanical damping is studied in amorphous ferromagnetic ribbons. Measurements are done at room temperature at frequencies between 100 and 300 Hz within the range of strain amplitudes from 10−6 to 10−4 and magnetic fields up to ≈ 1 × 104 A/m. A strong dependence of the magnetomechanical damping on the strain amplitude is observed. At the same time, the main contribution to the ΔE-effect is amplitude-independent. The obtained results are compared with the models considering reversible and irreversible processes of magnetic domain structure reconstructions. The top estimate of energy of the induced magnetic anisotropy in amorphous ribbon is received to K < 300 J/m3. [Russian Text Ignored].

A note of induced magnetic anisotropy in amorphous ribbons with negative magnetoelastic constant

A note of induced magnetic anisotropy in amorphous ribbons with negative magnetoelastic constant