We investigate experimentally and theoretically the dc voltage generated in ferromagnetic nonmagnetic metal bilayers under resonance. The is given by a superposition of contributions from spin pumping (${V}_{\mathrm{SP}}$) anisotropic magnetoresistance (${V}_{\mathrm{AMR}}$). A theoretical model presented that separately determines ${V}_{\mathrm{SP}}$ ${V}_{\mathrm{AMR}}$ as function applied static field intensity well in-plane angle. used to interpret detailed set data obtained series...

We present a theoretical model for the longitudinal spin-Seebeck effect (LSSE) in bilayers made of ferromagnetic insulator (FMI), such as yttrium iron garnet (YIG), and normal metal (NM), platinum (Pt), that relies on bulk magnon spin current created by temperature gradient across thickness FMI. show pumped into NM layer accumulation FMI provides continuity at FMI/NM interface is essential existence effect. The results theory are good agreement with experimental data variation LSSE sample...

The elementary spin excitations in strongly magnetic materials are collective deviations, or waves, whose quanta called magnons. Interest the experimental and theoretical investigation of magnons attracted many groups worldwide about 4–6 decades ago then waned for some time. In recent years, with advent field spintronics, area magnonics has gained renewed attention. New phenomena have been discovered experimentally, others predicted theoretically. this tutorial, we briefly review basic...

Direct current voltage appears across and in plane of a ferromagnetic multilayer experiencing resonance. We have investigated the dc simultaneously generated with excitation uniform mode magnetization precession ferromagnetic∕normal-metal∕ferromagnetic trilayers different spacer-layer materials. The strongly depends on chemical nature thickness normal-metal spacer as well microwave incident power. This might be correlated spin-pumping effect recently predicted.

A microwave-pumped spin-wave-instability experiment is used to demonstrate that chaos can be controlled by a small periodic perturbation of an available system parameter, as recently proposed Ott, Grebogi, and Yorke. The performed in yttrium-iron-garnet sphere the subsidiary-resonance configuration with modulation applied magnetic field. Observation Fourier spectrum low-frequency auto-oscillations measurment attractor dimension metric entropy clearly chaotic becomes when frequency amplitude...

A spin current is usually detected by converting it into a charge through the inverse Hall effect (ISHE) in thin layers of nonmagnetic metal with large spin-orbit coupling, such as Pt, Pd, and Ta. Here we demonstrate that ${\mathrm{Ir}}_{20}$${\mathrm{Mn}}_{80}$, high-temperature antiferromagnetic commonly employed spin-valve devices, exhibits effect, recently predicted theoretically. We present results experiments which currents are generated either microwave pumping or Seebeck bilayers...

The use of graphene in spintronic devices depends, among other things, on its ability to convert a spin excitation into an electric charge signal, phenomenon that requires spin-orbit coupling (SOC). Here we report the observation two effects show existence SOC large-area CVD grown single-layer deposited single crystal film ferrimagnetic insulator yttrium iron garnet (YIG). first is magnetoresistance induced by magnetic proximity effect with YIG. second detection dc voltage along layer...

It has been shown recently that a layer of the antiferromagnetic insulator (AFI) NiO can be used to transport spin current between ferromagnet (FM) and nonmagnetic metal (NM). In experiments one uses microwave-driven ferromagnetic resonance in FM produce pumped flows through an AFI reaches NM where it is converted into charge by means inverse Hall effect. Here we present theory for relies on carried diffusion thermal magnons. The explains quite well measured dependence voltage thickness layer.

The spin Seebeck effect (SSE) consists in the generation of a current by temperature gradient applied magnetic film. SSE is usually detected an electric voltage generated metallic layer contact with film resulting from conversion into charge means inverse Hall effect. has been widely studied bilayers made insulating ferrimagnet yttrium iron garnet (YIG) and metals large spin-orbit coupling such as platinum. Recently observed antiferromagnet $\mathrm{Mn}{\mathrm{F}}_{2}$ Pt, revealing...

Detailed measurements of the magnetic relaxation expressed in linewidth ferromagnetic resonance (FMR) absorption thick films yttrium iron garnet (YIG) and YIG/Pt bilayers carried out at room temperature reveal a very large increase rate with deposition Pt layer. The additional increases linearly microwave frequency characteristics spin pumping mechanism. value mixing conductance obtained from data is one order magnitude larger than largest possible determined voltage generated by FMR spin-pumping.

The tectono-sedimentary evolution of the Itararé Subgroup (Late Paleozoic) in southern flank Ponta Grossa arch, States Santa Catarina and Paraná, Brazil, is interpreted through stratigraphic analysis outcropping beds.Its seems to have been influenced by faulting causing rising falling arch.The section analyzed runs some 50 km SE-NW, from Mafra (SC)-Rio Negro (PR) Lapa includes about 700 m thickness glacio-clastic beds assigned Campo do Tenente formations.Paleocurrent orientation, sense...

A room-temperature giant magnetoimpedance (GMI) effect has been observed in thin amorphous ribbons of the soft ferromagnetic alloy ${\mathrm{Co}}_{75\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Fe}}_{\mathit{x}}$${\mathrm{Si}}_{15}$${\mathrm{B}}_{10}$ at low fields, H10 Oe. The size- and field-dependence are very sensitive to annealing conditions concentration x. peak value magneto-impedance ratio is strongly dependent on frequency measuring ac current. Values as large 130% have measured 1...

Giant magnetoimpedance (GMI) measured in ribbons of the soft ferromagnet Co75−xFexSi15B10 annealed presence a transverse magnetic field exhibits peaks its dependence. The GMI is strongly dependent on magnitude longitudinal and frequency applied current. We present theoretical model which explains existence based skin depth effect domain-wall motion due to ac

Strong experimental evidences of the formation quasiequilibrium Bose-Einstein condensation (BEC) magnons at room temperature in a film yttrium iron garnet (YIG) excited by microwave radiation have been recently reported. Here we present theory for dynamics magnon gas driven field far out equilibrium that provides rigorous support BEC YIG magnetized plane. We show if driving power exceeds threshold value nonlinear magnetic interactions create cooperative mechanisms onset phase transition...

NiO is a room-temperature antiferromagnetic (AF) insulator with important applications in AF spintronics. Although it considered prototypical material simple magnetic structure two sublattice spins aligned easy planes and having small in-plane anisotropy, its critical behavior has not been studied detail. Here we present an experimental investigation of the field for transition from to spin-flop (SF) phase obtained magnetization susceptibility measurements. The measured temperature...

The longitudinal spin Seebeck effect (LSSE) consists in the generation of a current parallel to temperature gradient applied across thickness bilayer made ferromagnetic insulator (FMI), such as yttrium iron garnet (YIG), and metallic layer (ML) with strong orbit coupling, platinum. LSSE is usually detected by DC voltage generated along ML due conversion into charge perpendicular static magnetic field means inverse Hall effect. Here we present model for that relies on bulk magnon created FMI....

Results are reported of a detailed study static and dynamic responses in symmetric systems consisting two ferromagnetic films separated by nonferromagnetic spacer layer. A comparison is made with experimental results for grown sputter deposition an UHV chamber, namely, NiFe/Cu/NiFe Fe/Cr/Fe. First, we present model calculations where the coupling between magnetic through dipolar, bilinear, biquadratic exchange interactions fully taken into account, together surface, in-plane uniaxial, cubic...

Ferromagnetic resonance and Brillouin light-scattering techniques have been used to investigate the spin-wave damping in ferromagnetic (FM)/antiferromagnetic bilayers exhibiting exchange bias. The measurements were done prototype system NiFe/NiO sputtered on Si(100) as a function of NiFe film thickness. linewidths measured with both are more than one order magnitude larger similar films without bias increase dramatically decreasing FM data consistently explained by relaxation mechanism based...

A spin-wave theory is presented for the magnetization dynamics in a ferromagnetic film that traversed by spin-polarized carriers at high direct-current densities. It shown nonlinear effects due to four-magnon interactions arising from dipolar and surface anisotropy energies limit growth of driven spin wave produce shifts microwave frequency oscillations. The explains quantitatively recent experimental results nanometric point contacts onto magnetic multilayers showing downward (redshifts)...

Subharmonic frequencies and chaotic behavior have been observed in spin-wave, microwave, parallel-pumping experiments with yttrium iron garnet at room temperature. Above the spin-wave-instability threshold, low-frequency (\AA{} 100 kHz) self-oscillations develop power absorbed by sample various bifurcation sequences are depending on orientation wave vector of primary unstable mode. The results interpreted a model parametric pumping two spin-wave modes coupled nonlinear interaction.

From a high-resolution, far-infrared laser study of the antiferromagnetic resonance (AFMR) Fe${\mathrm{F}}_{2}$, it is shown that magnetic polariton model not only reproduces broad (\ensuremath{\sim}4 kOe) complex structures observed in transmission, but essential to determination intrinsic (radiative and nonradiative) contributions linewidth. For purest Fe${\mathrm{F}}_{2}$ crystal an upper bound 20 Oe for $\ensuremath{\Delta}H$ was found. The extended include effects Mn impurities. theory...

We demonstrate that spin waves propagating in a film of yttrium iron garnet (YIG) can be amplified by dc current an adjacent Pt layer means the Hall effect. The experiments are done at room temperature using pulsed currents to avoid sample heating. Amplification occurs only for surface like modes direction perpendicular applied in-plane field. results interpreted with model spin-wave propagation YIG magnetic losses and subject spin-transfer torque due created effect layer.

The excitation of ferromagnetic magnons by a macroscopic time-varying magnetic field is analyzed quantum mechanically. quantization the spin excitations made method Holstein and Primakoff, generalized for case general nonuniform static field. Both linear nonlinear mechanisms are considered, with driving being either perpendicular or parallel to Particular attention given coherence properties magnon states generated.