Magnetic fine particle-insulator composite films containing Fe-Ni particles and insulating epoxy used for electromagnetic-wave-absorbing were synthesized by a newly developed electrochemical method termed the “layer-by-layer (LbL)-assisted plating method.” A reaction solution water-soluble resin was film fabrication. Cu substrates Ti/Pt plates as cathode anode, respectively. In LbL-assisted plating, attraction of charged to electrostatic force electrodeposition occurred simultaneously. LbL...

Co <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</inf> (Ta,Zr)x ( <tex xmlns:xlink="http://www.w3.org/1999/xlink">0.05\leq x \leq 0.16</tex> ) amorphous films with zero magnetostriction have been deposited by rf sputtering and their magnetic properties thermal stabilities investigated. The are obtained in the composition range of content as high 95 at.%. Saturation magnetization 4&piMs at room temperature at.% 85 Co-Ta-Zr is about 15 kG 10...

In-plane uniaxial anisotropic CoPd-CaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanogranular soft magnetic films for gigahertz applications were prepared using RF tandem-sputtering deposition with substrate revolution. Strong anisotropy a large field exceeding 50 kA/m was achieved in the centrifugal-centripetal direction of revolution, regardless presence or absence an applied external dc induced anisotropy. X-ray pole-figure...

The authors have fabricated the polycrystalline Li–Zn–Cu ferrite as a new temperature sensitive ferrite. had high-frequency permeability profile and high electrical resistivity well Ni–Zn–Cu for multilayered surface-mounting device such chip inductor filter. Since both excellent magnetic property sensitivity, it will be suitable miniaturization of inductive sensing device. In this study, relationship between grain size temperature-dependent properties has been investigated. Three kinds...

In-plane isotropic crossed anisotropy multilayer for high-frequency was fabricated using in-plane uniaxial anisotropic nanogranular film because of its high permeability, ferromagnetic resonance (FMR) frequency, and electrical DC resistivity. The exhibited isotropy enabled us to combine permeability 100, FMR frequency 3 GHz, resistivity 5 μΩ∙m, furthermore, low damping factor 0.015 obtained, hence the can be available a loss up 1 GHz. On other hand, underlayer cap layer were necessary...

We studied a possible mechanism for the highly sensitive response of electrical resistivity to strain in metal Cr by means theoretical calculation and experimental measurement. First-principles calculations based on density functional theory were performed antiferromagnetic spin-density wave (SDW) state. The succeeded reproduce significant magnetovolume effect hydrostatic pressure observed Cr, obtained result revealed that electronic structure magnetic properties SDW state are uniaxial...

The changes in the soft magnetic properties of ion beam sputtered films Fe-Co alloy with substitution Mn or V have been investigated. Thin deposited at a substrate temperature Ts as low 70°C high coercive force Hc above 150 Oe and large perpendicular anisotropy mainly induced by internal stress. On other hand, decrease increase Ts. disappears Fe-Co-M(M:Mn,V) 250°C, which results improvement properties, although minimum attained this work is 16 Oe. This value larger than that for binary...

電子機器の高速化や小型化等の手段として,駆動周波数や使用電波等の高周波化が進展している。これに対応するべく新規高周波磁性材料も続々と開発されており,高周波磁気/マイクロ磁気は,今後も重要な学問・技術である。最新動向としては,電磁ノイズ抑制分野,スイッチング電

This paper explains and introduces the magnetic materials for high-frequency applications, e.g., ferrites, composites, films. High resistivity downsizing are necessary a reduction of Joule losses (skin effects), furthermore, high resonance frequency complex permeability is also demanded decrease losses.

An estimation method of material characteristics a magnetic film-type noise suppressor on microstrip line (MSL) was investigated. First, the electrical equivalent circuit MSL with film obtained. A resistance due to ferromagnetic resonance loss calculated by using circuit. eddy current estimated least squares for regression prediction. Next, parameters were genetic algorithm in order obtain high suppression effect at 5, 7, and 10 GHz low insertion 1 GHz. The conductive an electromagnetic...

In-plane isotropic crossed anisotropy multilayer for high-frequency magnetics was fabricated using in-plane uniaxial anisotropic nanogranular film owing to its high permeability, ferromagnetic resonance (FMR) frequency, and electrical dc resistivity. The exhibited isotropy enabled us combine permeability of approximately 100, FMR frequency 3 GHz, resistivity <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

The relationship between the surface morphology and magnetic characteristics of Fe films deposited by dual ion beam sputtering was investigated. voltage current for were fixed at 1200 V, 50 mA, respectively. Ar bombardment V/sub A/ varied in range 80 2000 V. mere under condition that sputtered atoms arrived incident angle 45/spl deg/ ions bombarded film normal to plane. composed grains elongated a direction perpendicular below 400 changed parallel above 800 easy axis plane also 400/spl...

This paper discusses near field, conduction and crosstalk noise suppression of magnetic films with uniaxial anisotropy on transmission lines for a film-type suppressor in the GHz frequency range. The electromagnetic suppressions different permeability resistivity were measured simulated simple microstrip lines. experimental results Co-Zr-Nb CoPd-CaF2 agreed each other. indicate that higher leads to better field shielding, range 2–7 GHz, suppression. It also suggests below 2 GHz. These can...

It has been very difficult to develop a miniaturized temperature sensor device using the conventional temperature-sensitive ferrites, such as Mn-Zn ferrite, which is due difficulty of high-frequency operation, because their low natural resonance frequency (below 1 MHz) and electrical resistivity (around 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> -10 xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> Omegamiddot cm). The authors...

It was found that Li-Zn-Cu ferrite has remarkable temperature dependence of complex permeability which conformed to an exponential function. In order apply the sensor devices, fundamental investigation executed with a LC resonant circuit using and capacitor. Its impedance spectra greatly depended on atmosphere temperature, such revolved by simple approximate line or linear Consequently, authors suggested micro-chip device will be obtained both superior sensitivity high-frequency performance.

This paper demonstrated crosstalk suppressions of three-type noise suppressors using Co–Zr–Nb, Ni–Fe, and (Co–Pd)–CaF2 soft magnetic films. Simple two parallel microstrip lines (MSLs) with the line width 95 μm were fabricated used as a test bench to evaluate suppression. The films placed on MSLs suppressed both near- far-end crosstalks around effective ferromagnetic resonance (FMR) frequencies. By applying an external field films, FMR contribution was clarified. These results indicate...

Multi-layer chip coils were fabricated by the green sheet technique using polycrystalline Li-Zn-Cu ferrite or Ni-Zn-Cu ferrite, and their complex impedance spectra analyzed with help of numerical calculation. When is used, multi-layer are very sensitive to residual stress, they deviate markedly from values calculated permeability, permittivity, coil dimensions. On other hand, it was found that a may be determined permeability permittivity as well Consequently, use made easy for us design...

In a previous study, thick-film Mn-Zn ferrite particle/polyimide composite material for power inductors was developed using screen printing technique. This film enabled us to obtain thin planar inductor. However, downsizing of the inductor required that particles be replaced by other magnetic with higher permeability. this we used two powdery metals create material, and fabricated downsized such composites. When in step-down chopper dc-dc converter, exhibited electric properties equal those...

Fe films have been deposited by ion beam sputtering using Ar, Kr, and Xe gases. The voltage VS was varied in the range of 900–1800 V. magnetic properties had significant relationship with element gas. saturation magnetization 4πMS 21 kG for Ar 20 Kr or Xe. coercivity HC took minimum value 5 Oe at 1200 V Ar. energy/the number energetic particles, such as sputtered atoms recoiled ions bombarding to substrate calculated Monte-Carlo simulation system an amorphous target. average energy ES 40–60...