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With the aim of contributing to the advancement and development of the emerging field of spin wave optics, we investigate the propagation of magnetostatic surface spin waves in a uniform permalloy waveguide with grooves and constrictions created by in-situ atomic force microscopy nanolithography. Our findings reveal that the introduction of these artificial defects in the spin waves path leads to an unexpected reduction in the signal intensity of the transmitted spin wave compared with a waveguide interrupted by a full slit. This remarkable extinction phenomenon dominates the tunnel-like propagation facilitated by magnetic dipolar coupling across the gap. Combining experimental and numerical analyses, the complex interplay between spin wave tunneling, diffraction and reflection at the edges of the waveguide is comprehensibly addressed. These results provide new insights into the controllable manipulation of spin waves, opening up promising avenues for the development of spin wave switches and interferometers.

Magnonics --- Spin wave optics --- Nanomagnetism --- Spectroscopy --- Atomic force nanolithography --- Physique, chimie, mathématiques & sciences de la terre > Physique

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The Special Issue on Recent Advances in Nanomagnetism is a compilation of articles, addressing various aspects of magnetic properties and behaviour in low dimensional magnetic materials. One contribution addresses the novel magnetic properties in a nanohybrid of iron oxide and carbide nanoparticles grown in diamond. Magnetic textures, such as skyrmion structures, form an important area of research in nanomagnetism, this forms the topic of another contribution. Several aspects of magnetisation dynamics are addressed in other contributions and relate to the developments of microresonators and microantennas applied to the study of magnetic nanostructures; the ferromagnetic resonance behaviour in nanodot systems are also considered. Materials development forms an important area of study in nanomagnetism, and, as such, the preparation conditions, such as annealing under an applied field, can have important effects on the magnetic properties of thin films and low dimensional structures. Such considerations form the study of one of the contributions. Perpendicular magnetic anisotropy has a number of important applications in magnetic storage materials; this is the subject of two further contributions.

Information technology industries --- Computer science --- magnetic nanohybrid materials --- nanodiamonds --- nanoparticles --- iron carbides --- Fe3C --- spinel-type iron oxide --- Mössbauer spectroscopy --- skyrmions --- micromagnetic simulations --- geometric pinning --- finite-element modelling --- ferromagnetic resonance --- microantenna --- microresonator --- magnetic relaxation --- thin films --- nanostructures --- [Co/Ni]2/PtMn multilayers --- magnetic field annealing --- hysteresis loop vertical shift --- exchange coupling --- nanomagnetism --- magnetic multilayers --- micromagnetism --- magnetization dynamics --- magnetic nanodots --- coupled magnetic thin films --- perpendicular magnetic anisotropy --- n/a --- Mössbauer spectroscopy

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This reprint focuses on fundamentals and applied research on magnetic structures with curved geometries. The influence of curvature in the magnetic structures is an appealing topic of research opening novel perspectives to engineer the magnetic textures and the magnetisation reversal processes. Special attention is given to the fabrication and optimisation of magnetic structures, their characterisation and possible use in technological applications.

Research & information: general --- Physics --- Electricity, electromagnetism & magnetism --- soft magnetic materials --- amorphous magnetic wires --- magnetic domains --- magneto-optic Kerr effect --- giant magnetoimpedance effect --- magnetic anisotropy --- 3D nanowire networks --- spin caloritronics --- thermoelectricity --- spintronics --- giant magnetoresistance multilayers --- glass-coated microwires --- micromagnetic structure --- impedance --- magnetic permeability --- nanomagnetism --- focused-electron-beam-induced deposition --- nanofabrication --- nanolithography --- magnetic nanowires --- three-dimensional --- core-shell --- purification --- thermal annealing --- electron holography --- cylindrical magnetic nanowires --- magnetocrystalline anisotropy --- magnetochiral configurations --- micromagnetic modeling --- amorphous microwires --- high-frequency magnetoimpedance --- SOLT calibration --- nanoporous anodic alumina template --- electrodeposition --- ALD --- magnetic nanowire and nanotube --- core/shell nanostructure --- FORC analysis --- MOKE --- magnetization reversal --- soft magnetic materials --- amorphous magnetic wires --- magnetic domains --- magneto-optic Kerr effect --- giant magnetoimpedance effect --- magnetic anisotropy --- 3D nanowire networks --- spin caloritronics --- thermoelectricity --- spintronics --- giant magnetoresistance multilayers --- glass-coated microwires --- micromagnetic structure --- impedance --- magnetic permeability --- nanomagnetism --- focused-electron-beam-induced deposition --- nanofabrication --- nanolithography --- magnetic nanowires --- three-dimensional --- core-shell --- purification --- thermal annealing --- electron holography --- cylindrical magnetic nanowires --- magnetocrystalline anisotropy --- magnetochiral configurations --- micromagnetic modeling --- amorphous microwires --- high-frequency magnetoimpedance --- SOLT calibration --- nanoporous anodic alumina template --- electrodeposition --- ALD --- magnetic nanowire and nanotube --- core/shell nanostructure --- FORC analysis --- MOKE --- magnetization reversal