The interaction between different types of wave excitation in hybrid systems is usually anisotropic. Magnetoelastic coupling surface acoustic waves and spin strongly depends on the direction external magnetic field. However, present study we observe that even if orientation field supportive for coupling, magnetoelastic can be significantly reduced with a particular profile normal to at distances much smaller than wavelength. We use Brillouin light scattering investigation thermally excited...

The concept of space-time crystals (STC), i.e., translational symmetry breaking in time and space, was recently proposed experimentally demonstrated for quantum systems. Here, we transfer this to magnons demonstrate a driven STC at room temperature. is realized by strong homogeneous microwave pumping micron-sized permalloy (Py) stripe directly imaged scanning transmission x-ray microscopy (STXM). For fundamental understanding the formation STC, micromagnetic simulations are carefully adapted...

Magnonic crystals (magnetic metamaterials for manipulating spin waves) are important building blocks rf filters and logic. However, regular pose significant constraints complex designs. This study combines time-resolved x-ray microscopy numerical modeling to show that quasiperiodic Fibonacci provide advanced control of the magnonic band structure. Furthermore, yields insight into quasicrystal's inner workings, a simple analytical model is derived facilitate application these systems.

Co2Fe0.4Mn0.6Si (CFMS) and Co2FeGa0.5Ge0.5 (CFGG) Heusler alloys are among the most promising thin film materials for spintronic devices due to a high spin polarization, low magnetic damping giant/tunneling magnetoresistance ratios. Despite numerous investigations of properties performed up now, magnetoelastic effects in these remain not fully understood; quite rare studies correlations between other properties, such as dissipation or anisotropy. In this research we have investigated...

We comment on a frequently applied analysis of an out-of-plane angular dependence the ferromagnetic resonance linewidth $\ensuremath{\Delta}H$ in thin films. Using expanded Suhl's formula for field-swept linewidth, we show that number magnetic films is well described as sum two terms only: intrinsic contribution and extrinsic one due to Gilbert damping two-magnon scattering, respectively. For some special cases (e.g., with perpendicular anisotropy), additional term inhomogeneous broadening...

Magnonic quasicrystals can be used to manipulate spin waves, offering possibilities beyond those of periodic magnonic crystals. The authors investigate one-dimensional Fibonacci and demonstrate the existence collective waves over a broad range wave vectors. spin-wave spectra here are tunable by changing magnetic field amplitude (for continuous band-structure adjustment), magnetization configuration reprogrammability), or dimensions elements scalability). Beyond being fundamentally...

The magnetoresistance (MR) of Heusler alloy Ni50Mn35Sn15 epitaxial films on MgO substrates is studied as a function temperature T and magnetic field H. large negative MR extends over martensitic transformation with maximum −22% at 110 K. In austenitic phase, the −3% −5%, respectively. We show that governed mainly by magnetization paraprocess high fields scales square Δm(H,T)2.

Magnetic tunnel junctions with a magnetic layer perpendicular anisotropy are currently used in computer memories that do not require voltage sustaining. An example of layers ultrathin FeCo films on Au substrate. Here, we present an experimental and computational study Fe$_{0.75}$Co$_{0.25}$ thickness up to two nanometers. The investigated surrounded both sides by layers. In experiment, found polycrystalline below 0.74 nm (five atomic monolayers). We also measured strong surface contribution...

Magnetization reversal processes in Au/Co/Au-wedge/Co/Au pseudo-spin-valve structures characterized by perpendicular anisotropy of 0.6-nm-thick Co layers were investigated magneto-optical Kerr effect. The samples deposited on a Ti/Au buffer layer differing Au-layer thickness (different surface roughness and crystallite size). distinctive influence the dependences switching fields, energy effective interlayer coupling, versus Au spacer is presented. In particular, increasing buffer-layer...

We report on long-range spin wave (SW) propagation in nanometer-thick yttrium iron garnet (YIG) film with an ultralow Gilbert damping. The knowledge of a wavenumber value $|\vec{k}|$ is essential for designing SW devices. Although determining the experiments like Brillouin light scattering spectroscopy straightforward, quantifying all-electrical has not been widely commented upon so far. analyze magnetostatic YIG films order to determine excited by coplanar waveguide. show that it crucial...

The paper concerns experimental verification of the magnitude imaginary part spin mixing conductance in bilayers comprising heavy metals. We present results broadband ferromagnetic resonance studies on heterostructures consisting Finemet thin films covered by Pt and Ta wedge layers with aim to observe pumping effects evaluate both real parts conductance. are analyzed framework a recent microscopic theory which allows us estimate value interfacial spin-orbit interaction confirm its important...

We report broadband ferromagnetic resonance (FMR) measurements based on a coplanar waveguide (CPW) of ultrathin magnetic film structures that comprise in-plane/out-of-plane decoupled layers deposited nonmagnetic buffer various thickness or other with diverse sheet resistance. show the excitation fundamental mode can be substantially (up to 10 times) enhanced in low resistance comparison thin weakly conducting layers. The results are analyzed terms shielding electromagnetic field CPW by...

We show that using maskless photolithography and the lift-off technique, patterned yttrium iron garnet thin films possessing ultra-low Gilbert damping can be accomplished. The of 70 nm thickness were grown on (001)-oriented gadolinium gallium by means pulsed laser deposition, they exhibit high crystalline quality, low surface roughness, effective magnetization 127 emu/cm3. parameter is as 5×10−4. obtained structures have well-defined sharp edges which along with good structural magnetic film...

The relationship between proximity-induced magnetism (PIM) at the heavy metal/ferromagnet interface and spin-transport across such interfaces has generated significant debate. To investigate link two, element specific x-ray magnetic circular dichroism ferromagnetic resonance measurements were made on same CoFe/Au/Pt NiFe/Au/Pt thin film samples with varying Au thickness, complementary SIMS analysis, which shows evidence of Ni diffusion from NiFe into Pt. An approximately linear is observed...

Nowadays, the CoFeB thin layered film is intensively studied because of its potential applications in spintronic devices, especially devices based on spin-transfer torque phenomena. Hitherto, it has been shown that may possess perpendicular magnetic anisotropy (PMA) when sandwiched between different layers (e.g. MgO, Pt, Pd, Ta, W). However, there no experimental evidence CoFeB, Au layers, strong PMA. Moreover, comparison with other noble metals, Au-based systems exhibit smallest spin...

We present a detailed study of Ta/Ru-based buffers and their influence on features crucial from the point view applications Magnetic Tunnel Junctions (MTJs) such as critical switching current thermal stability. buffer/FeCoB/MgO/Ta/Ru buffer/MgO/FeCoB/Ta/Ru layers, investigating crystallographic texture, roughness buffers, magnetic domain pattern, dead layer thickness, perpendicular anisotropy fields for each sample. Additionally, we examine effect induced magnetization complete nanopillar...

The study of low-damping multiferroic materials with strong magnetodielectric coupling is important for advancing several areas in electronics and spintronics; because the scarcity these materials, though, they have not seen industrial application. This investigates a high-temperature oxide exceptionally low damping, reveals an overlooked checkerboard ordering oxygen vacancies structure, which could shed light on physical aspects that rule material's functional applicability.

Damping and spin transport in spintronic multilayered systems continues to be a topic of active research. The enhancement damping ferromagnet (FM)/spacer layer (SL)/heavy-metal (HM) thin-film was studied for ${\mathrm{Co}}_{25}{\mathrm{Fe}}_{75}/\mathrm{SL}/\mathrm{Pt}$ with nonmagnetic (NM) SL either Au or Cu variable thickness, order understand the correlation proximity-induced magnetism (PIM) HM. Structural, PIM magnetic measurements were undertaken on same samples. Specifically,...

We investigate experimentally and theoretically the magnetization reversal process in one-dimensional magnonic structures composed of permalloy nanowires two different widths finite length arranged a periodic quasiperiodic order. The main features hysteresis loop are determined by shape anisotropies component elements dipolar interactions between them. showed, that forming ribbon can be controlled change distance neighboring ribbons. order influence introduction additional tiny switching...

Time resolved STXM provides deep insights into efficient excitation of symmetric and antisysmmetric higher order spin wave modes in magnonic waveguides. <italic>k</italic>-selective imaging reveals real space information simultaneously excited mode patterns.

Exchange bias is studied in thin film systems, which three types of Heusler alloys (Ni2MnSn, Co2MnSn, and Co2FeSi) are contact with an antiferromagnet. Magnetic exchange interactions between the constituting atoms (i.e., Ni-Mn, Mn-Mn, Co-Mn, Co-Fe, or Co-Co) differ substantially these alloys. We explain influence stiffness A within coupling alloy antiferromagnet a finite interface volume. Insertion ultrathin Co layer at interfaces brings about enhancement alloy/antiferromagnet system.

Ferromagnetic resonance has been investigated in Ni2MnSn Heusler alloy lms.The lms were deposited at 673 < T 723 K on MgO(001) substrates by means of magnetron sputtering.X-ray diraction conrmed that the epitaxial.The had magnetic parameters typical bulk with L21 structural order.From angular dependences eld and ferromagnetic linewidth intrinsic Gilbert contribution extrinsic to due two-magnon scattering separated.Our data indicate a room temperature damping 0.007, which is comparable...

Spin wave emission and propagation in magnonic waveguides represent a highly promising alternative for beyond-CMOS computing. It is therefore all the more important to fully understand underlying physics of process. Here, we use time-resolved scanning transmission x-ray microscopy directly image formation process globally excited local spin waves permalloy waveguide at nanoscale. Thereby, observe from corner as well oscillation domain-wall-like structure within waveguide. Additionally, an...

The dispersion relations of thermal magnons and phonons, which exist in a multilayered CoFeB/Au sample deposited on silicon substrate, were determined by using Brillouin light scattering spectrometry the oblique geometry, for 45° angle between in-plane-oriented static magnetization wave vector. Due to low effective saturation multilayer, we able measure crossing branches spin waves surface acoustic with signature magnetoelastic interactions form coalescence branches. geometry was chosen...