68 research outputs found
Discovery of metastable tetragonal disordered phase upon phase transitions in the equiatomic nanostructured FePd alloy
Specific features of the phase transformation 1 ā L10 (space groups Fm3m and P4/mmm, respectively) in single crystals of the equiatomic alloy FePd subjected to annealings both in the absence and in the presence of external uniaxial load, as well as in polycrystalline samples that had undergone severe plastic deformation via high-pressure torsion and subsequent annealing, have been studied. An investigation of the single crystals in a nanostructured state formed at different stages of ordering annealing was performed using optical polarization, thermomagnetic and transmission electron microscopy (TEM) methods. The nanostructured state of the polycrystalline samples FePd after deformation of both disordered and ordered FePd alloys and subsequent annealing was examined with the help of TEM and X-ray techniques. The results obtained were analyzed based on the known concepts of the symmetry theory of phase transitions. It was concluded that the atomic ordering in the FePd alloys is preceded by the formation of a ferroelastic disordered body-centered tetragonal phase with the structural type 6 and the space group I4/mmm. Experimental data that evidence the existence of a tetragonal disordered phase both in the single crystals and in the polycrystalline samples of FePd after severe plastic deformation and subsequent annealing are reported. Thus, the A1 ā A6 ā L10 phase transformation represents a combination of different types of phase transitions such as cooperative displacement A1 ā 6 and ordering A6 ā L10 of atoms
Dynamic self-organization of magnetic domains in amorphous films with perpendicular anisotropy
Dynamic Systems of Concentric Ring Magnetic Domains in a Highly Anisotropic Garnet Ferrite Film in Magnetic Fields at Infrasonic Frequencies
Influence of parameters of the harmonic magnetic field on the dynamic hysteresis loops and domain structure of a ferrite garnet film
Three-dimensional diagrams of the regions occupied by induced Anger states in a multidomain magnetic medium
Possibility of the appearance of spin autowaves in a model of a ferromagnet with nonuniform dissipation
Dynamic domain structures and hysteresis loops of iron garnet films with a moderate anisotropy
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