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The structures, spin reorientations, magnetic, and magnetostrictive properties of the polycrystalline Pr(Fe1−xCox)1.9 (x = 0–1.0) cubic laves phase alloys between 5 K and 300 K are investigated. Large low-field magnetostrictions are observed at 5 K in the alloys with x = 0.2 and 0.4 due to the low magnetic anisotropies of these two alloys. A large negative magnetostriction of about −1130 ppm is found in PrCo1.9 alloy at 5 K. The magnetizations of the alloys with decrease abnormally at the spin reorientation temperature , and an abnormity is detected in the alloy with x = 1.0 at its Curie temperature (45 K). The substitution of Fe by Co increases the value of in the alloy with x value increasing from 0.0 to 0.4, and then reduces the value of with x value further increasing to 0.6. [ABSTRACT FROM AUTHOR]

We report a pure ferromagnetic metallic magnetoplasmonic structure consisting of two-dimensional ordered Ni nanodisks array on Co film. With a sufficient height of the nanodisks, a steep and asymmetric Fano resonance can be excited in this structure. We attribute the fascinating spectral lineshape to the strong coupling between the excitation of surface plasmon polaritons at the interface and the localized surface plasmon resonance of nanodisks. The conclusion is fully confirmed by spectrum measurements in nanostructures with different heights. Furthermore, the enhancement and sign of the magneto-optical Kerr rotation in this structure are significantly modified by the Fano resonance. [ABSTRACT FROM AUTHOR]