The development of spintronic emitters broadband terahertz (THz) pulses relies on designing heterostructures in which the processes laser-driven spin current generation and subsequent spin-to-charge conversion are most efficient. interface between ferromagnetic nonmagnetic layers an emitter is a critical element. In this study, we experimentally examined single-cycle THz pulse from laser-pulse-excited Pt/Co with 1.2-nm-thick composition-gradient Pt Co compared it emission conventional...

We explore a thermal mechanism of changing the magnetic anisotropy by using femtosecond laser pulses in low-symmetry dielectric ferrimagnetic garnet ${(\mathrm{YBiPrLu})}_{3}{(\mathrm{FeGa})}_{5}{\mathrm{O}}_{12}$ film grown on (210)-type ${\mathrm{Gd}}_{3}{\mathrm{Ga}}_{5}{\mathrm{O}}_{12}$ substrate as model media. Employing spectral magneto-optical pump-probe technique and phenomenological analysis, we demonstrate that magnetization precession this is result laser-induced changes...

Using a time-resolved optically-pumped scanning optical microscopy technique we demonstrate the laser-driven excitation and propagation of spin waves in 20-nm film ferromagnetic metallic alloy Galfenol epitaxially grown on GaAs substrate. In contrast to previous all-optical studies employ laser-induced thermal changes magnetocrystalline anisotropy as an mechanism. A tightly focused 70-fs laser pulse excites packets magnetostatic surface with $e^{-1}$ length 3.4 $\mu$m, which is comparable...

The rate and pathways of relaxation a magnetic medium to its equilibrium following excitation with intense short laser pulses are the key ingredients ultrafast optical control spins. Here we study experimentally evolution magnetization anisotropy thin films ferromagnetic metal galfenol (Fe$_{0.81}$Ga$_{0.19}$) resulting from femtosecond pulse. From temporal hysteresis loops deduce that $M_S$ parameters $K$ recover within nanosecond, ratio between satisfies thermal equilibrium's power law in...

An alternative method for spin pumping -- injection of a pure current into nonmagnetic material by the precessing magnetization in an adjacent ferromagnet is demonstrated without need to use microwaves. Femtosecond laser pulses trigger precession (Fe,Ga) layers separated 5-nm Cu spacer. The currents emerging from two couple their magnetization, leading superposition collective modes, observed time-resolved Kerr rotation measurements. For resonant frequencies layers, authors achieve strongly...

We demonstrate a variety of precessional responses the magnetization to ultrafast optical excitation in nanolayers Galfenol (Fe,Ga), which is ferromagnetic material with large saturation and enhanced magnetostriction. The particular properties Galfenol, including cubic magnetic anisotropy weak damping, allow us detect up 6 magnon modes 120-nm layer, single mode effective damping ${\alpha}_{eff}$ = 0.005 frequency 100 GHz 4-nm layer. This highest observed date time-resolved experiments...

A 170 fs laser pulse quenches perpendicular magnetic anisotropy and induces spin reorientation transition in an ultrathin electrode of a CoFeB/MgO/CoFeB MTJ due to different sensitivities interfacial shape anisotropies ultrafast heating.

The critical behavior of laser-induced changes in magnetic ordering is studied experimentally two-dimensional zigzag antiferromagnets XY-like ${\mathrm{NiPS}}_{3}$ and Ising-like ${\mathrm{FePS}}_{3}$. To examine dynamics flakes these compounds, we employ time-resolved exchange linear dichroism effect sensitive to independent the orientation antiferromagnetic vector. In both compounds laser excitation vicinity absorption edge induces partial quenching manifested by reduction. amplitude...

Using a magneto-optical pump-probe technique with micrometer spatial resolution we show that magnetization precession can be launched in individual magnetic domains imprinted Co$_{40}$Fe$_{40}$B$_{20}$ (CoFeB) layer by elastic coupling to ferroelectric BaTiO$_{3}$ substrate. The dependence of the parameters on external field strength and orientation reveal laser-induced ultrafast partial quenching magnetoelastic parameter CoFeB $\approx$27% along 10% demagnetization trigger precession....

Employing short laser pulses with a duration below 100 fs for changing magnetic state of magnetically-ordered media has developed into distinct branch magnetism femtomagnetism which aims at controlling magnetization ultimately timescales. Among plethora femtomagnetic phenomena, there is class related to impact femtosecond on anisotropy materials and nanostructures defines orientation magnetization, resonance frequencies spin waves propagation. We present review main experimental results...

The ability of light to manipulate fundamental interactions in a medium is central research optomagnetism and applications electronics. A prospective approach create composite quasiparticles, magnetic polarons, highly susceptible external stimuli. To control transport properties by weak electric fields, it important find materials that support photoinduced polarons with colossal net moments. Here, we demonstrate record-high moment, reaching exceeding hundred thousand Bohr magnetons, can be...

The development of spintronic emitters broadband THz pulses relies on designing heterostructures where processes laser-driven spin current generation and subsequent spin-to-charge conversion are the most efficient. An interface between ferromagnetic nonmagnetic layers in emitter is one critical elements. Here, we study experimentally single-cycle pulse from a laser-pulse excited Pt/Co with composition gradient Pt Co compare it emission conventional structure an abrupt interface. We find that...

Ultrafast photo-induced phase transitions occurring under the impact of femtosecond laser pulses provide versatile opportunities for switching solids between distinctly-different crystalline, electronic, and magnetic states thus modify their functional properties in a significant way. In this paper, we report on laser-induced spin reorientation Verwey single crystalline ferrimagnetic magnetite ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$. Using optical magneto-optical pump-probe techniques, define...

Light-induced magnetization response unfolding on a temporal scale down to femtoseconds presents way convey information via spin manipulation.

We have studied relaxation processes of the photocurrent and light-induced giant injection magnetoresistance (${\mathrm{IMR}}^{(ph)}$) in ${\mathrm{SiO}}_{2}(\mathrm{Co})/\mathrm{GaAs}$ heterostructures, where ${\mathrm{SiO}}_{2}(\mathrm{Co})$ structure is granular ${\mathrm{SiO}}_{2}$ film with Co nanoparticles, found that accompanied by oscillations. Relaxation oscillations are caused transitions between electrons on highest level interface quantum well. The ${\mathrm{IMR}}^{(ph)}$ reaches...

The critical behaviour of laser-induced changes in magnetic ordering is studied experimentally two-dimensional zigzag antiferromagnets $XY$-like NiPS$_3$ and Ising-like FePS$_3$. To examine dynamics flakes these compounds, we employ time-resolved exchange linear dichroism effect sensitive to independent the orientation antiferromagnetic vector. In both compounds laser excitation vicinity absorption edge induces partial quenching manifested by reduction. amplitude varies with temperature as...

AbstractZnO films obtained by high-frequency magnetron sputtering and doped with a Fe^57 metallic 3 d impurity the diffusion method are studied. The type of local environment atoms on varying deposition parameters ZnO is determined Mössbauer spectroscopy. It established that ground state corresponds to iron in magnetically ordered there small fraction corresponding complex oxide Fe_3O_4, having state; also paramagnetic state. magnetic magnetooptical were measured using magnetooptic Kerr...

Abstract Using time-resolved magneto-optical pump-probe technique we demonstrate excitation of magnetization precession in a single crystalline bulk magnetite Fe 3 O 4 below and the vicinity Verwey spin-reorientation (SR) phase transitions. Pronounced temperature dependence amplitude is observed suggesting that occurs via laser-driven transition. Similarity between characteristic features laser-induced ultrafast SR transitions suggests they both rely on same microscopic processes.