Scalable production of high-quality MoS

We show that the magnetic characteristics of Ta|CoFeB|MgO heterostructures are strongly influenced by doping Ta underlayer with nitrogen. In particular, saturation magnetization drops upon underlayer, suggesting doped acts as a boron diffusion barrier. addition, thickness dead layer decreases increasing nitrogen doping. Surprisingly, interface anisotropy increases to ∼1.8 erg/cm2 when an optimum amount is introduced into underlayer. These results serves good for spintronic applications...

We have studied the underlayer thickness and temperature dependences of current induced effective field in CoFeB|MgO heterostructures with Ta based underlayers. The at which saturates is found to be different between two orthogonal components field, i.e. damping-like term tends saturate smaller than field-like term. For large films saturates, we find that significantly influences size field. A striking difference dependence components: decreases whereas increases increasing temperature....

The flow of in-plane current through ultrathin magnetic heterostructures can cause magnetization switching or domain-wall nucleation owing to bulk and interfacial effects. Within the layer, create instabilities via spin transfer torques (STT). At interface(s), generated from Hall effect in a neighboring layer exert torques, referred as on moments. Here, we study current-induced perpendicularly magnetized CoFeB/MgO with heavy metal (HM) underlayer. Depending thickness HM underlayer, find...

The evolution of damping in Co/Pt, Co/Au, and ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$/Pt bilayers was studied with increasing nonmagnetic (NM) heavy-metal layer thicknesses the range $0.2\phantom{\rule{0.28em}{0ex}}\phantom{\rule{4pt}{0ex}}\mathrm{nm}\ensuremath{\le}{t}_{\mathrm{NM}}\ensuremath{\le}10\phantom{\rule{0.28em}{0ex}}\phantom{\rule{4pt}{0ex}}\mathrm{nm}$, where ${t}_{\mathrm{NM}}$ is NM thickness. Magnetization precession measured time domain using time-resolved magneto-optical...

Abstract Interfacial Dzyaloshinskii-Moriya interaction (IDMI) is important for its roles in stabilizing the skyrmionic lattice as well soliton-like domain wall motion leading towards new generation spintronic devices. However, achievement and detection of IDMI often hindered by various spurious effects. Here, we demonstrate occurrence originating primarily from W/CoFeB interface technologically W/CoFeB/SiO 2 heterostructures using Brillouin light scattering technique. Due to presence IDMI,...

We have studied structural and magnetic properties of Ta|CoFeB|MgO heterostructures using cross-section transmission electron microscopy (TEM), energy loss spectrum (EELS) imaging, vibrating sample magnetometry. From the TEM studies, CoFeB layer is found to be predominantly amorphous for as deposited films, whereas small crystallites, diameter ∼5 nm, are observed in films annealed at 300 °C. find that presence such nanocrystallites not sufficient occurrence perpendicular anisotropy. Using...

Generation and utilization of pure spin current have revolutionized energy-efficient spintronic devices. Spin pumping effect generates current, for its increased efficiency, spin-mixing conductance interfacial transparency are imperative. The plethora reports available on generation with giant magnitude overlook the transparency. Here, we investigate in β-Ta/CoFeB thin films by an all-optical time-resolved magneto-optical Kerr technique. From variation Gilbert damping Ta CoFeB thicknesses,...

The development of advanced spintronics devices hinges on the efficient generation and utilization pure spin current. In materials with large spin-orbit coupling, Hall effect may convert charge current to current, a conversion efficiency, which is quantified by angle (SHA), desirable for realization miniaturized energy-efficient spintronic devices. Here, we report giant SHA in beta-tungsten (\ensuremath{\beta}-W) thin films...

A strong nonreciprocal spin wave emission is realized using Ta/Py bilayers for switch and logic applications.

Abstract Interface modification for control of ultrafast magnetic properties using low-dose focused ion beam irradiation is demonstrated bilayers two technologically important materials: Ni 81 Fe 19 and Pt. Magnetization dynamics were studied an all-optical time-resolved magneto-optical Kerr microscopy method. relaxation, precession, damping the spatial coherence magnetization studied. precession was fitted with a single-mode damped sinusoid to extract Gilbert parameter. A systematic study...

$X$-band electron magnetic resonance together with dc and ac measurements were employed for comparative study of ordering in bulk nanometer-sized ${\mathrm{La}}_{0.9}{\mathrm{Ca}}_{0.1}\mathrm{Mn}{\mathrm{O}}_{3}$ single crystals. A dramatic difference between crystal showing mixed state, constituted by coexisting canted antiferromagnetic $A$-type matrix nanometer sized ferromagnetic clusters, the nanocrystalline form same compound, mainly ordering, has been revealed. The complementary...

Abstract We have studied the magnetic layer thickness dependence of orbital moment in heterostructures to identify contributions from interfaces. Three different heterostructures, Ta/CoFeB/MgO, Pt/Co/AlO x and Pt/Co/Pt, which possess significant interface contribution perpendicular anisotropy, are as model systems. X-ray circular dichroism spectroscopy is used evaluate relative moment, i.e. ratio spin moments, elements constituting heterostructures. find that Co Pt/Co/Pt remains constant...

The interfacial Dzyaloshinskii-Moriya interaction (iDMI) plays a key role in stabilizing magnetic skyrmions, tiny topological hedgehogs that could provide basis for spintronics. Investigating the iDMI as function of layer thicknesses technologically important heterostructures, authors observe constant $D$ varies linearly with inverse Co-Fe-B thickness, demonstrating its purely origin, whereas relationship to Ta thickness is complex, and nearly independent above threshold value. Boron...

The effect of spin torque from the Hall in Pt/Ni81Fe19 rectangular bilayer film was investigated using time-resolved magneto-optical Kerr microscopy. Current flow through stack resulted a linear variation effective damping up to ±7%, attributed current injection Pt into Ni81Fe19. angle estimated as 0.11 ± 0.03. modulation depended on between and bias magnetic field. These results demonstrate importance optical detection precessional magnetization dynamics for studying transfer due effect.

Periodically patterned composite ferromagnetic nanostructures known as magnonic crystals (MCs) are promising for spintronic and other spin-based technologies, they manipulate spin waves in analogy to photonic crystals' manipulation of light. The authors create an array asymmetric sawtooth waveguides that presents two different one-dimensional MCs perpendicular directions, yet not a two-dimensional MC. Its band structure gap tuned by rotating the applied magnetic field, its edge modes may...

In single crystals of 2H-NbSe2, we identify for the first time a crossover from weak collective to strong pinning regime in vortex state which is not associated with peak effect phenomenon. Instead, find an anomalous history dependent magnetization response. dc magnetic field (Bdc)-temperature (T) matter phase diagram demarcate this boundary. We also delineate another boundary separates region thermal fluctuation dominated regime, and that appears on

The driven state of a well-ordered flux line lattice in single crystal 2H-NbSe2 the time domain has revealed presence substantial fluctuations velocity, with large and distinct periods ( approximately seconds). A superposition periodic drive vortex causes changes these fluctuations. We propose that prior to onset peak effect there exists heretofore unexplored regime coherent dynamics, unexpected behavior velocity

We have studied microwave emission from a current-perpendicular-to-plane pseudo spin valve nanopillars with Heusler alloy Co2Fe(Ga0.5Ge0.5) electrodes. Large amplitude exceeding 150 nV/Hz0.5, partly owing to the large magnetoresistance, and narrow generation linewidth below 10 MHz are observed. also find that shows significant dependence on applied field magnitude its angle within film plane. A minimum in is observed when slope of frequency versus current becomes near zero. This agrees...