The dependence of the intrinsic Gilbert damping parameter ${\alpha }_0$ on the spin-orbital coupling strength $\xi$ is investigated in $L{1}_0$ ordered ${\mathrm{FePd}}_{1\mathrm{\text{−}}x}{\mathrm{Pt}}_x$ films by time-resolved magneto-optical Kerr effect measurements and spin-dependent ab initio calculations. Continuous tuning of ${\alpha }_0$ over more than one order of magnitude is realized by changing the $\mathrm{Pt}/\mathrm{Pd}$ concentration ratio showing that ${\alpha }_0$ is proportional to ${\xi }^2$ as changes of other leading parameters are found to be negligible. The perpendicular magnetic anisotropy is shown to have a similar variation trend with $x$. The present results may facilitate the design and fabrication of new magnetic alloys with large perpendicular magnetic anisotropy and tailored damping properties.

The sequestration of Se(IV) by zero-valent iron (ZVI) is strongly influenced by the coupled effects of aging ZVI and the presence of a weak magnetic field (WMF). ZVI aged at pH 6.0 with MES as buffer between 6 and 60 h gave nearly constant rates of Se(IV) removal with WMF but with rate constants that are 10- to 100-fold greater than without. XANES analysis showed that applying WMF changes the mechanism of Se(IV) removal by ZVI aged for 6–60 h from adsorption followed by reduction to direct reduction. The strong correlation between Se(IV) removal and Fe²⁺ release suggests direct reduction of Se(IV) to Se(0) by Fe⁰, in agreement with the XANES analysis. The numerical simulation of ZVI magnetization revealed that the WMF influence on Se(IV) sequestration is associated mainly with the ferromagnetism of ZVI and the paramagnetism of Fe²⁺. In the presence of the WMF, the Lorentz force gives rise to convection in the solution, which narrows the diffusion layer, and the field gradient force, which tends to move paramagnetic ions (esp. Fe²⁺) along the higher field gradient at the ZVI particle surface, thereby inducing nonuniform depassivation and eventually localized corrosion of the ZVI surface.

The magnetic insulator yttrium iron garnet (YIG) with a ferrimagnetic transition temperature of $\sim 560$ K has been widely used in microwave and spintronic devices. Anomalous features in spin Seeback effect (SSE) voltages have been observed in Pt/YIG and attributed to magnon-phonon coupling. Here, we use inelastic neutron scattering to map out low-energy spin waves and acoustic phonons of YIG at 100 K as a function of increasing magnetic field. By comparing the zero and 9.1 T data, we find that instead of splitting and opening up gaps at the spin wave and acoustic phonon dispersion intersecting points, magnon-phonon coupling in YIG enhances the hybridized scattering intensity. These results are different from expectations of conventional spin-lattice coupling, calling for different paradigms to understand the scattering process of magnon-phonon interactions and the resulting magnon polarons.

The anomalous Hall effect (AHE) in $L{1}_0{\mathrm{FePd}}_{1-x}{\mathrm{Pt}}_x$ alloy films is studied both experimentally and theoretically. We find that the intrinsic contribution (${\sigma }_{\mathrm{AH}}^{\mathrm{int}}$) to the AHE can be significantly increased, whereas the extrinsic side-jump contribution (${\sigma }_{\mathrm{AH}}^{\mathrm{sj}}$) can be continuously reduced from being slightly larger than ${\sigma }_{\mathrm{AH}}^{\mathrm{int}}$ in $L{1}_0$ FePd to being much smaller than ${\sigma }_{\mathrm{AH}}^{\mathrm{int}}$ in $L{1}_0$ FePt, by increasing the Pt composition $x$. We show that this chemical composition tuning of the intrinsic contribution is afforded by the stronger spin-orbit coupling strength on the $\mathrm{Pd}/\mathrm{Pt}$ site when the lighter Pd atoms are replaced by the heavier Pt atoms. Our results provide a means of manipulating the competing AHE mechanisms in ferromagnetic alloys for fully understanding the AHE and also for technological applications of ferromagnetic alloys.

We study the anomalous Hall-like effect (AHLE) and the effective anisotropic magnetoresistance (EAMR) in antiferromagnetic $\gamma -{\mathrm{IrMn}}_3/{\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}\left(\mathrm{YIG}\right)$ and Pt/YIG heterostructures. For $\gamma -{\mathrm{IrMn}}_3/\mathrm{YIG}$, the EAMR and the AHLE resistivity change sign with temperature due to the competition between the spin Hall magnetoresistance (SMR) and the magnetic proximity effect (MPE) induced by the interfacial antiferromagnetic uncompensated magnetic moment. In contrast, for Pt/YIG, the AHLE resistivity changes sign with temperature whereas no sign change is observed in the EAMR. This is because the MPE and the SMR play a dominant role in the AHLE and the EAMR, respectively. As different types of galvanomagnetic properties, the AHLE and the EAMR have proved vital in disentangling the MPE and the SMR in metal/insulating-ferromagnet heterostructures.