Low remanent magnetization as key prerequisite for the ability of helicity dependent all-optical magnetic switching (AOS) is demonstrated an artificial zero moment magnet. A heterostructure consisting two amorphous ferrimagnetic Tb36Fe64 and Tb19Fe81 alloy layers designed to yield a net at room temperature by means antiparallel interfacial exchange coupling dominant moments. The canceling layer magnetizations provide vanishing demagnetization fields AOS. Contrary this, no observed single...

Rapid thermal annealing was applied to transform sputter-deposited Fe51Pt49/Cu bilayers into L10 chemically ordered ternary (Fe51Pt49)100−xCux alloys with (001) texture on amorphous SiO2/Si substrates. It found that for thin film samples, which were processed at 600 °C 30 s, the addition of Cu strongly favors ordering and formation. Furthermore, it could be revealed by transmission electron microscopy backscatter diffraction observed reduction temperature content is accompanied an increased...

Ferri-/ferromagnetic exchange coupled composites are promising candidates for bit patterned media because of the ability to control magnetic properties ferrimagnet by its composition. A micromagnetic model bilayer system is presented where we also incorporate microstructural features both layers. Micromagnetic finite element simulations performed investigate magnetization reversal behaviour such media. By adding ferromagnet, switching field could be reduced up 40% and distribution narrowed....

We have designed and fabricated 2-D giant magnetoresistance spin-valve sensors on the basis of exchange-biased NiFe-CoFe/Cu/CoFe/IrMn nanolayers in monolithic integration for high-sensitivity compass applications. For a maximum signal-to-noise ratio, we realized focused double full-bridge layout with an antiparallel alignment pinned layer magnetization neighboring meanders. This precise is achieved microscopic resolution by laser heating subsequent in-field cooling. Striving high-signal...

Thin films of $L{1}_{0}$-ordered (Fe${}_{51}$Pt${}_{49}$)${}_{100\ensuremath{-}x}$Cu${}_{x}$ with (001) texture were obtained by rapid thermal annealing FePt(5 nm$\ensuremath{-}t$)/Cu($t$) bilayers deposited magnetron sputtering at room temperature on thermally oxidized Si(001) substrates. The $L{1}_{0}$ long-range ordering fully described two independent chemical order parameters was investigated anomalous x-ray diffraction measurements performed the Fe $K$ and Pt $L$${}_{\text{III}}$...

We report unipolar resistive switching in polycrystalline, hexagonal yttrium manganite thin films grown on unpatterned Pt metal coated SiO2/Si substrates with circular Al top electrodes. Electroforming-free or electroforming-based is observed, depending the chemical composition (Y1Mn1O3, Y0.95Mn1.05O3, Y1Mn0.99Ti0.01O3, and Y0.94Mn1.05Ti0.01O3). The number of loading cycles measured at room temperature for samples Y1Mn1O3 Y0.95Mn1.05O3 larger than 103. dominant conduction mechanism...

CoFeB alloys are highly relevant materials for spintronic applications. In this work, the crystallization of triggered by thermal annealing was investigated x-ray diffraction techniques and scanning electron microscopy, as well spectroscopic ellipsometry magneto-optical Kerr effect spectroscopy temperatures ranging from 300 to ${600}^{\ensuremath{\circ}}\mathrm{C}$. The transformation \ensuremath{\sim}100-nm-thick ${\mathrm{Co}}_{x}{\mathrm{Fe}}_{(80\ensuremath{-}x)}{\mathrm{B}}_{20}$ films...

Nanoscale, low-phase-noise, tunable transmitter–receiver links are key for enabling the progress of wireless communication. We demonstrate that vortex-based spin-torque nano-oscillators, which intrinsically low-noise devices because their topologically protected magnetic structure, can achieve frequency tunability when submitted to local ion implantation. In experiments presented here, gyrotropic mode is excited with spin-polarized alternating currents and anisotropic magnetoresistance...

Adsorption of α-helical polyaniline self-assembled monolayers onto magnetic substrates containing a thin Co layer determines the magneto-optical response.

We study the charge and spin dependent scattering in a set of CoFeB thin films whose crystalline order is systematically enhanced controlled by annealing at increasingly higher temperatures. Terahertz conductivity measurements reveal that transport closely follows development phase, with increasing structural leading to conductivity. The terahertz-induced ultrafast demagnetization, driven spin-flip mediated spin–orbit interaction, measurable pristine amorphous sample much reduced highest...

We report the optical and magneto-optical properties of amorphous crystalline Co60Fe20B20 films with thicknesses in range 10 nm to 20 characterized using spectroscopy ellipsometry (SE) Kerr effect (MOKE) spectroscopy. derived spectral dependence dielectric tensor from experimental data for samples prior after annealing vacuum. The features function can be directly related transitions between electronic states observed changes upon ascribed an increase ordering CoFeB.

The performance of CoFeB/MgO tunnel junctions is strongly dependent on an annealing step at the end fabrication process to first, set a reference magnetization through exchange bias effect and second, crystallize MgO/CoFe layers while boron diffuses out, in order maximize magnetoresistance ratio. In this regard, laser-induced presents several advantages against traditional oven techniques, providing scalable approach with no limitations regarding defined that can be aligned different...

Polycrystalline YMnO3 thin films sandwiched between an un-patterned bottom electrode (Pt or Pt/Ti) and a circular top (Au Al) reveal electroforming-free, unipolar resistive switching. We report switching devices endurance depending on the electrode. The number of loading cycles Al/YMnO3/Pt switch is larger than 103. resistance ratio high (OFF) low (ON) state 104, which can be further increased to 105 by decreasing diameter Al

We have investigated ferroelectric charged domains in polycrystalline hexagonal yttrium manganite thin films (Y1Mn1O3, Y0.95Mn1.05O3, Y1Mn0.99Ti0.01O3, and Y0.94Mn1.05Ti0.01O3) by scanning electron microscopy (SEM) secondary emission mode with a small acceleration voltage. Using SEM at an voltage of 1.0 kV otherwise homogenous surface charging effects are reduced, polarization charges can be observed directions (±Pz) the identified. Thin different chemical composition been deposited pulsed...

We studied the giant magnetoresistance (GMR) effect in [Co/Pt] <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> /Co/Cu/Co/[Co/Pt] pseudo-spin-valves with perpendicular magnetic anisotropy (PMA) and analyzed impact of Cu spacer layer thickness as well Co at Cu/Co interface. The magnetotransport measurements were carried out by a four-point probe method current-in-plane geometry room temperature additionally van der Pauw low temperatures....

We investigate the switching field distribution and resulting bit error rate of exchange coupled ferri-/ferromagnetic bilayer island arrays by micromagnetic simulations. Using islands with varying microstructure anisotropic properties, intrinsic is computed. The dipolar contribution to obtained separately using a model triangular patterned array resembling 1.4 Tb/in2 media. Both contributions are computed for different thicknesses soft ferrimagnet also ferromagnetic single phase FePt...

In this paper, the magnetization reversal of exchange-biased Py/CoO vortex structures was investigated. The were prepared by film deposition onto closely packed arrays silica particles. By zero field cooling below N\'eel temperature antiferromagnetic CoO, a so called circular exchange bias can be imprinted. completing same process in an applied magnetic field, either displaced or even $c$ state stabilized, which depends strongly on CoO layer thickness. A strong athermal training effect...

The specific local alignment of the magnetization a reference layer in spin valves has rapidly growing significance implementation monolithically integrated sensor devices. spatial sensitivity such sensors is defined by exchange bias effect arising strongly coupled ferromagnetic (FM) and antiferromagnetic (AFM) heterostructures. (re-)setting orientation direction can be achieved through annealing means focused laser beam subsequent cooling presence magnetic field. parameters exposure will...

Abstract This work presents a combined optical and magneto‐optical spectroscopic study of thulium iron garnet (Tm 3 Fe 5 O 12 , TmIG) films on substituted gadolinium gallium (Gd 2.6 Ca 0.4 Ga 4.1 Mg 0.25 Zr 0.65 sGGG) substrates. Spectroscopic ellipsometry, transmission spectroscopy, Kerr effect spectroscopy Raman results are presented for TmIG with thickness in the range from 20 to 300 nm grown sGGG by pulsed laser deposition. The complex dielectric functions determined compared previously...

We report on selective realignment of the magnetization direction exchange biased ferromagnetic layer in two different spintronic stacks using laser radiation. The bias effect occurs an antiferromagnetic/ferromagnetic bilayer system when cooled external magnetic field below Néel temperature and results a shift hysteresis loop with increased coercivity. is utilized to pin reference spin valve systems. investigated pinned plane Co/Pt multilayer perpendicular bias. were heated above defined...

Abstract Local crystallization of ferromagnetic layers is crucial in the successful realization miniaturized tunneling magnetoresistance (TMR) devices. In case Co–Fe–B TMR devices, used most successfully so far applications and are initially deposited an amorphous state annealed post-deposition to induce Co–Fe, thereby increasing device performance. this work, first direct proof locally triggered 10 nm thick films by laser irradiation provided means X-ray diffraction (XRD) using synchrotron...