-
[show abstract]
[hide abstract]
ABSTRACT: The influence of the bilinear and biquadratic coupling on the exchange anisotropy of the ferromagnetic/antiferromagnetic bilayer was studied by variable angle and temperature dependent ferromagnetic resonance. From the angular dependence of the resonance field the bilinear and biquadratic exchange coupling constants were determined.
Acta Physica Polonica Series a 01/2007; 113:167-170. · 0.44 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The magnetic and microstructural study of Fe-rich cold-drawn amorphous wire has been performed. The influence of the current annealing on the process of the formation of helical magnetic structure in the surface area of the wire has been investigated. The correlation between the magnetic and structural properties of cold-drawn wire is discussed.
IEEE Transactions on Magnetics 11/2005; · 1.36 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: From the observations of the magnetoimpedance effect on Fe-rich amorphous wires, our work is devoted to the investigation of the magnetic structure of Fe<sub>77.5</sub>B<sub>15</sub>Si<sub>7.5</sub> amorphous wires obtained by in-rotating-water-quenching technique and reduced by cold-drawn process to 0.05 mm. The results of the magneto-optical Kerr effect and X-ray diffraction methods show that current annealing produces strong helical anisotropy in the cold-drawn Fe-rich wires. We consider that the formation of the helical anisotropy in the studied wires is related to the deformation, which was observed on the surface of the wire after the cold-drawing process, and could also be considered as the driving force for the crystallization.
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International; 05/2005
-
[show abstract]
[hide abstract]
ABSTRACT: The magnetization reversal of the bilayer polycrystalline FeNi(50 Å)/FeMn(50 Å) film sputtered in a magnetic field has been studied by magnetic and magneto-optical techniques. The external magnetic fields were applied along the easy or hard magnetization axis of the ferromagnetic permalloy layer. The asymmetry of hysteresis loop has been found. Appreciable asymmetry and the exchange bias were observed only in the field applied along the easy axis. The specific features of magnetization reversal were explained within the phenomenological model that involves high-order exchange anisotropy and misalignment of the easy axes of the antiferromagnetic and ferromagnetic layers. It has been shown that the film can exist in one of three equilibrium magnetic states in the field applied along the easy axis. The transitions between these states occur as first-order phase transitions. The observed hysteresis loop asymmetry is related to the existence of the metastable state.
Journal of Magnetism and Magnetic Materials.
