Angular dependence of the exchange coupling in a NiFe/CoO bilayer film has been measured. Different angular and symmetry have observed for field ${H}_{E}$ coercivity ${H}_{C}.$ The values ${H}_{C}$ are due to unidirectional uniaxial components magnetic anisotropy energy, which odd even terms lead ${H}_{C},$ respectively. proposed free energy accounts experimental results.

A holistic approach to fully characterize the physical–chemical properties of N doped TiO₂ and evaluate its true impact on photoelectrochemical applications.

We measure the effect of dc-electric-field--temperature sequences on finite-frequency dielectric constant \ensuremath{\varepsilon}(\ensuremath{\omega}), and thermally stimulated depolarization current single crystals Pb (${\mathrm{Mg}}_{1/3}$${\mathrm{Nb}}_{2/3}$)${\mathrm{O}}_{3}$ (PMN). The results are interpreted in terms a field-induced change low-temperature phase PMN from glassy to rhombohedral ferroelectric. latter transition has first-order characteristics, occurs only if dc field...

Magneto-impedance effects have been observed in thin films of amorphous Fe73.5Cu1Nb3Si13.5B9. Large magneto-impedance values obtained field-annealed samples, but not as-deposited samples. Transverse with magnitudes comparable to the longitudinal case observed. These results are discussed terms appropriate magnetic permeability.

The magnetoimpedance (MI) effect of amorphous Co70.4Fe4.6Si15B10 ribbons, subjected to different annealing conditions with and without an external field, has been measured up a frequency 100 kHz. We show that the large MI is result transverse magnetic anisotropy, which present in as-cast suitably field-annealed samples.

The magnetoimpedance (MI) effect was investigated in NiFe/Ag multilayered (ML) and ML/SiO 2 /Ag/SiO /ML structured (SD) ferromagnetic films grown by magnetron sputtering. MI measurements were performed with an impedance analyzer over a wide frequency range, from 10 MHz to 1.8 GHz. Sample geometries are mainly responsible for the different behaviours considering entire distinct mechanisms changes associated. For ML sample, maximum value of 80%, associated appearance resonance (FMR), reached...

We provide the first quantitative comparison between Barkhausen-noise experiments and recent predictions from theory of avalanches for pinned interfaces, both in beyond mean-field. study different classes soft magnetic materials: polycrystals amorphous samples, characterized by long-range short-range elasticity, respectively; thick thin i.e. with without eddy currents. The temporal avalanche shape at fixed size, observables related to joint distribution sizes durations are analyzed detail....

We investigate the angular dependence of asymmetric magnetoimpedance NiFe/IrMn multilayers and explore possibility tuning linear region curves by modifying angle between applied external magnetic field exchange bias field, probe current frequency. quantify sensitivity calculating ratio |ΔZ|/|ΔH| at low fields as a function frequency for samples cut with different orientations show that considerable values in around zero can be reached. The results extend possibilities application biased...

Abstract Magnetoelastic (ME) resonance devices are attractive for application as biosensors in health-related areas they allow contactless detection of pathogenic agents with high sensitivity. After functionalization, offer valuable diagnostic options that promote efficient capture mass on the sensor surface through biological interactions. ME sensors also sensitive to external factors such temperature, magnetic fields, and variations can arise from processes unrelated interactions,...

Magnetization dynamic response of coupled and uncoupled spin valves with structure NiFe(20 nm)/Cu(t_Cu)/NiFe(20 nm)/IrMn(10nm) were probed using broadband ferromagnetic resonance absorption measurements. By varying the Cu thickness t_Cu we able to tailor coupling intensity between free pinned layers. Broadband spectra show two resonant modes for each measured field. It is noticed that among NiFe layers modifies amplitude peaks and, moreover, dispersion relations modes, which are distorted...

In the field of spin caloritronics recent theoretical models suggested a significant influence interfaces magnetic tunnel junction (MTJ) on thermal transport. this work magnetothermopower measurements are carried out CoFeB/MgO/CoFeB nanopillars and an unexpected increase thermovoltage with diameter is observed. To understand behavior profiles computed by finite element simulations. The observed pillar could only be reproduced in simulations considering far lower effective conductivity MgO...

Here we present the first example of excitation-independent blue-emitting carbon dots (iC-dots) obtained by pyrolysis citric acid (CA) without post-treatment chromatographic separation. To confine growth and shape nanoparticles, silica gel with immobilized aminopropyl groups (SiO2–NH2) was used as a nanoreactor. It demonstrated that carbonization SiO2–NH2 embedded CA resulted in formation unbound wC-dots iC-dots. Because their firm attachment to surface, iC-dots can be easily separated from...

Gigahertz magnetoimpedance (MI) curves obtained in an exchange biased Ni81Fe19/Fe50Mn50 multilayer are reported. Experimental MI shifted by the bias field (HEB), following features presented hysteresis curves. Theoretical curves, calculated using classical expression for impedance of a planar magnetic conductor, describe well experimental data. The results open possibilities application exchanged multilayered materials development autobiased linear sensors.

The magnetoimpedance effect is a versatile tool to investigate ferromagnetic materials, revealing aspects on the fundamental physics associated magnetization dynamics, broadband magnetic properties, important issues for current and emerging technological applications sensors, as well insights resonance at saturated even unsaturated samples. Here, we perform theoretical experimental investigation of thin film geometry high frequency range. We calculate longitudinal single layered,...

Barkhausen effect in ferromagnetic materials provides an excellent area for investigating scaling phenomena found disordered systems exhibiting crackling noise. The critical dynamics is characterized by random pulses or avalanches with scale-invariant properties, power-law distributions, and universal features. However, the traditional statistics may not be sufficient to fully characterize complex temporal correlation of magnetic domain walls dynamics. Here we focus on multifractal scenario...

Giant magneto-impedance (GMI) results for Metglas 2705M have been studied in two measuring geometries several field annealed samples. A rich variety of peak features GMI, all within a small range, observed. The various the GMI are discussed terms magnetic susceptibility and microstructural properties amorphous ribbon.

In this work, the magnetization dynamics of soft magnetic materials is studied with aid transverse differential permeability μ(Iac,f,Hdc) spectra. Contributions to processes from domain wall motion and rotation can be extracted data which are in turn obtained impedance Z(Iac,f,Hdc) particular, an iteration method used extract data. The approach tested samples a very well known structure, namely (110)[001]FeSi3%. Permeability spectra were frequency range (100 Hz⩽f⩽100 kHz), probe current...

Field-dependent transverse permeability characterization of amorphous thin films with nominal composition Fe73.5Cu1Nb3Si13.5B9 was performed for frequencies in the range 100kHz–1.8GHz. Dynamic and static magnetic properties were investigated thickness from 21to5000nm. Samples thicknesses below 85nm exhibit a well-defined in-plane uniaxial anisotropy uniform ferromagnetic resonance modes. thicker than found to be magnetically isotropic plane, complex dynamics depicted by several modes...

Given that the magnetoinductive effect (MI), skin and ferromagnetic resonance influence magnetic permeability behavior at different frequency ranges, description of magnetoimpedance over a wide range becomes difficult task. To end, we perform an experimental investigation in tri-layered thin film range. We compare results for with numerical calculus performed using approach considers transverse susceptibility model planar systems appropriate system together. The show remarkably good...

We investigate the high-frequency response of magnetization dynamics through magnetoimpedance (MI) effect in Permalloy-based multilayered thin films produced with two different non-magnetic metallic spacers: Cu and Ag. Due to nature spacer materials, we are able play magnetic properties study both systems weak/strong anisotropy. verify very rich features behavior high ratios, values above 200%. compare MI results obtained distinct spacers number bilayers, discuss them terms mechanisms that...

Many systems crackle, from earthquakes and financial markets to Barkhausen effect in ferromagnetic materials. Despite the diversity essence, noise emitted these dynamical consists of avalanche-like events with broad range sizes durations, characterized by power-law avalanche distributions typical average shape that are fingerprints describing universality class underlying dynamics. Here we focus on crackling ferromagnets scrutinize traditional statistics avalanches polycrystalline amorphous...