Magnetic metamaterials made of non-magnetic resonators - metaatoms - are an essential part of metamaterial world reacting to the ac magnetic field and being able to demonstrate negative permeability. We describe local permeability distribution in the vicinity of the resonant frequency where effective medium theory is not applicable because of metasurfaces' finite sizes and the excitation of magnetoinductive (MI) waves. We show that inter-element coupling significantly affects not only MI waves passband but the local permeability distribution. (C) 2017 Elsevier B.V. All rights reserved.

In this review, we will survey recent experimental results on magnetic, magnetocaloric, magnetotransport, and magneto-optical properties of Ni–Mn–In-based Heusler alloys in bulk polycrystalline samples, melt-spun ribbons, and glass-coated microwires. These ternary Ni–Mn–In and doped, quaternary alloys comprise a novel class of multifunctional magnetic materials with exceptional properties related to the magnetostructural martensitic transformation. We will focus on recent developments that have led to a better understanding of properties that are promising for applications, possible routes for improvements, and the identification of unsolved problems.

The experimental data of morphological, structural, transport and magnetic properties of sintered Co(100−x)(CuO)x composites are reported. The positive transverse magnetoresistance was observed at low fields. This effect is due to the strong spin-dependent scattering of conduction electrons on the surface-oxidized layers of Co particles.

Magnetic properties, the Hall effect and crystallic structure of atomic-disordered γ-MnGa near the stoichiometric γ-Mn3Ga composition were studied within the temperatures 300–1000K. Heisenberg spin glass with random competing anisotropy have been obtained where the longitudinal L, transverse T and mixed LT-phases of spin glass, the Q-phase with nonzero parameter of order have been experimentally observed. Successive transitions in spin glass phase have been found. The anomalous Hall effect coefficient is temperature independent and equals Ra=0.8×10−9ΩcmG−1 both in the paramagnetic region and in the spin glass state.

The experimental data on morphological, structural, transport, and magnetic properties of sintered Co100-x(CuO)(x) composites are reported. The Mooij correlation is not valid for these composites because the resistivity increases with the temperature up to 320 mu Ohm.cm and does not saturate below the percolation threshold. The positive transverse magnetoresistance was observed at low fields. This effect is due to the strong spin-dependent scattering of conduction electrons on oxidized surface layers of Co particles. Hall resistivity behavior unusual for ferromagnets was observed and explained in the framework of the effective medium approach.