Strain-Tuned Spin-Wave Interference in Micro- and Nanoscale Magnonic Interferometers

Here, we report on the experimental study of spin-wave propagation and interaction in the double-branched Mach–Zehnder interferometer (MZI) scheme. We show that the use of a piezoelectric plate (PP) with separated electrodes connected to each branch of the MZI leads to the tunable interference of the spin-wave signal at the output section. Using a finite element method, we carry out a physical investigation of the mechanisms of the impact of distributed deformations on the magnetic properties of YIG film. Micromagnetic simulations and finite-element modelling can explain the evolution of spin-wave interference patterns under strain induced via the application of an electric field to PP electrodes. We show how the multimode regime of spin-wave propagation is used in the interferometry scheme and how scaling to the nanometer size represents an important step towards a single-mode regime. Our findings provide a simple solution for the creation of tunable spin-wave interferometers for the magnonic logic paradigm

Field-controlled phase-rectified magnonic multiplexer [includes .mif files for use with the micromagnetic simulation tool 'Object-Oriented Micro-Magnetic Framework' (OOMMF)]

This is the author accepted manuscript. The final version is available from IEEE via the DOI in this record.The attached '.mif' files are designed for use with the micromagnetic simulation tool 'Object-Oriented Micro-Magnetic Framework' (OOMMF). The software release, along with a user's guide, is free to download at http://math.nist.gov/oommf/. To use the '.mif' files, first load and run the '*relaxation.mif' script. Then, once this simulation has finished, rename the new '*.omf' file to 'Relaxed.omf', and then run the '*pulse.mif' script.The mechanism used to alter the features of propagating spin waves is a key component underpinning the functionality of high frequency magnonic devices. Here, using experiment and micromagnetic simulations, we demonstrate the feasibility of a magnonic multiplexer in which the spin-wave beam is toggled between device output branches by the polarity of a small global bias magnetic field. Due to the anisotropy inherent to the dispersion of magnetostatic spin waves, the phase fronts of the output spin waves are asymmetrically tilted relative to the direction of the beam propagation (group velocity). We show how the phase tilts could be (partly) rectified in magnonic waveguides of variable width.Engineering and Physical Sciences Research Council (EPSRC)Russian Science FoundationScholarship of the President of the Russian FederationRussian Foundation for Basic Researc

All-Dielectric Nanophotonics Enables Tunable Excitation of the Exchange Spin Waves

Launching and controlling magnons with laser pulses opens up new routes for applications including optomagnetic switching and all-optical spin wave emission and enables new approaches for information processing with ultralow energy dissipation. However, subwavelength light localization within the magnetic structures leading to efficient magnon excitation that does not inherently absorb light has still been missing. Here, we propose to marriage the laser-induced ultrafast magnetism and nanophotonics to efficiently excite and control spin dynamics in magnetic dielectric structures. We demonstrate that nanopatterning by a 1D grating of trenches allows localization of light in spots with sizes of tens of nanometers and thus launch the exchange standing spin waves of different orders. The relative amplitude of the exchange and magnetostatic spin waves can be adjusted on demand by modifying laser pulse polarization, incidence angle, and wavelength. Nanostructuring of the magnetic media provides a unique possibility for the selective spin manipulation, a key issue for further progress of magnonics, spintronics, and quantum technologies

Time-Delayed Anticancer Effect of an Extremely Low Frequency Alternating Magnetic Field and Multimodal Protein–Tannin–Mitoxantrone Carriers with Brillouin Microspectroscopy Visualization In Vitro

The effect of an extremely low frequency alternating magnetic field (ELF AMF) at frequencies of 17, 48, and 95 Hz at 100 mT on free and internalized 4T1 breast cancer cell submicron magnetic mineral carriers with an anticancer drug, mitoxantrone, was shown. The alternating magnetic field (100 mT; 17, 48, 95 Hz; time of treatment—10.5 min with a 30 s delay) does not lead to the significant destruction of carrier shells and release of mitoxantrone or bovine serum albumin from them according to the data of spectrophotometry, or the heating of carriers in the process of exposure to magnetic fields. The most optimal set of factors that would lead to the suppression of proliferation and survival of cells with anticancer drug carriers on the third day (in comparison with the control and first day) is exposure to an alternating magnetic field of 100 mT in a pulsed mode with a frequency of 95 Hz. The presence of magnetic nanocarriers in cell lines was carried out by a direct label-free method, space-resolved Brillouin light scattering (BLS) spectrometry, which was realized for the first time. The analysis of the series of integrated BLS spectra showed an increase in the magnetic phase in cells with a growth in the number of particles per cell (from 10 to 100) after their internalization. The safety of magnetic carriers in the release of their constituent ions has been evaluated using atomic absorption spectrometry

Giant Asymmetry of Domain Walls Propagation in Pd/Co/Pd(111) Epitaxial Structures with Different Interface Roughness

The motion of domain walls (DWs) in magnetic nanoscale layered systems attracts a great deal of attention due to the possible chiral nature of the energy dissipation occurring because of the presence of strong spin–orbit coupling and the broken inversion symmetry. Here, we report on a giant asymmetry of DWs propagation in the creep regime in the Pd/Co/Pd epitaxial system under the influence of driving out-of-plane (OOP) and symmetry breaking in-plane (IP) magnetic fields. With an increase in the thickness of the bottom Pd layer, which in turn leads to growth of the interface roughness of the Pd/Co/Pd samples, the asymmetry of DWs propagation increases. The maximal reliably measured relation of the velocities of right-handed and left-handed propagating DWs in the Pd(12.5)/Co(0.7)/Pd(3) sample, where thickness is in nanometers, is equal to 6600, which means almost complete blocking of the propagation of DWs in the direction determined by the appropriate choice of a combination of the applied magnetic fields. The observed giant asymmetry of the propagation of DWs indicates the importance of nanoengineering the parameters of the interfaces to control the propagation of DWs in magnetic memory and logic devices

The 2021 Magnonics Roadmap

Magnonics is a rather young physics research field in nanomagnetism and nanoscience that addresses the use of spin waves (magnons) to transmit, store, and process information. After several papers and review articles published in the last decade, with a steadily increase in the number of citations, we are presenting the first Roadmap on Magnonics. This a collection of 22 sections written by leading experts in this field who review and discuss the current status but also present their vision of future perspectives. Today, the principal challenges in applied magnonics are the excitation of sub-100 nm wavelength magnons, their manipulation on the nanoscale and the creation of sub-micrometre devices using low-Gilbert damping magnetic materials and the interconnections to standard electronics. In this respect, magnonics offers lower energy consumption, easier integrability and compatibility with CMOS structure, reprogrammability, shorter wavelength, smaller device features, anisotropic properties, negative group velocity, non-reciprocity and efficient tunability by various external stimuli to name a few. Hence, despite being a young research field, magnonics has come a long way since its early inception. This Roadmap represents a milestone for future emerging research directions in magnonics and hopefully it will be followed by a series of articles on the same topic