Room temperature soft ferromagnetism in the nanocrystalline form of YCo2 - a well-known bulk Pauli paramagnet

The Laves phase compound, YCo2, is a well-known exchange-enahnced Pauli paramagnet. We report here that, in the nanocrystalline form, this compound interestingly is an itinerant ferromagnet at room temperature with a low coercive-field. The magnitude of the saturation moment (about 1 Bohr-magneton per formula unit) is large enough to infer that the ferromagnetism is not a surface phenomenon in these nanocrystallites. Since these ferromagnetic nanocrystallines are easy to synthesize with a stable form in air, one can explore applications, particularly where hysteresis is a disadvantage

Chiral spin textures creation and dynamics in a rectangular nanostructure

Controlled creation of stable chiral spin textures is required to use them as an energy-efficient information carrier in spintronics. Here we have studied the stable creation of isolated chiral spin texture (skyrmion and antiskyrmion) and its pair through the magnetization reversal of a rectangular nanostructure using spin-polarized currents. An isolated spin texture is created through a negative current pulse. Dynamics of the stable spin texture are explored under external magnetic fields, and the resonant frequencies are calculated. A stable skyrmion pair is created using an asymmetric current pulse, and their interaction is studied using the Thiele equation. The stability of isolated or paired spin texture depends on the DMI strength, spin-polarized current density, and pulse duration. In addition, the stability of the skyrmion pair depends on their initial separation, and a threshold for the separation between skyrmions of 78 nm is observed.Comment: 29 pages, 11 figures, 2 extra figure

Structural and magnetic properties of Ba and Sn co-substituted bismuth ferrite

BiFeO3(BFO) and Bi0.90Ba0.10Fe1-xSnxO3(x = 0, 0.01 and x = 0.03) compounds were synthesized by conventional solid-state route. X-ray diffraction (XRD) patterns demonstrated that the compounds crystalized in rhombohedral structure with R3c (IUCr No. 161) space group. The XRD patterns and Fourier transformation infrared spectra evidenced that the crystal structure was distorted due to the substitutions. The magnetic properties of the compounds were greatly influenced by the substitution of Ba and Sn elements at their respective sites. The appearance of weak ferromagnetism with significant remnant magnetization and improved coercive field compared to that of BFO could be ascribed to suppression of spiral modulated spin structure. Higher breakdown voltages were observed in the substituted compounds from the polarization measurements