Changes in magnetic-domain configurations caused by the application of radio-frequency (rf) fields ranging from 3to18GHz were observed using magnetic force microscope. rf barely altered magnetization Co particles with scattered large crystalline anisotropy; however, for NiFe particles, switching occurred when approached natural ferromagnetic-resonance frequency 5.92GHz. However, reduction field fluctuated widely among particles. Scattering effective energy barrier to thermal fluctuations an...

The aim of the present study was to deposit tin oxide films on Si wafers or quartz crystal microbalance plates acting as substrates, using low-energy ion beams. substrates were held at ambient temperature and two different methods employed. In one case, exposed a 100 eV beam Sn+ ions together with flow gaseous oxygen, these conditions found generate films. Analyses by X-ray photoelectron spectroscopy (XPS) confirmed that made metallic tin. other trials, tetramethyltin in conjunction 50 O+...

Microwave-assisted magnetization reversal in a 0.36μm wide Ni80Fe20 wire with natural ferromagnetic resonance frequency of 8.42GHz was investigated experimentally. Magnetization switching could be detected from discontinuous change the wire. The application microwaves 7.5GHz and power 19.2dBm reduced field 217to142Oe. While high-power microwave-assisted dc field, it substantially broadened distribution. This is mainly attributed to inhomogeneous properties nucleation sites

Abstract Despite decades of advances in magnetic imaging, obtaining direct, quantitative information with nanometer scale spatial resolution remains an outstanding challenge. Current approaches, for example, Hall micromagnetometer and nitrogen-vacancy magnetometer, are limited by highly complex experimental apparatus a dedicated sample preparation process. Here we present new AC field-modulated force microscopy (MFM) report the local measurements individual nanoparticles (MNPs), which is one...

We have proposed an experimental methodology which makes it possible to deposit silicon carbide (SiC) films on Si substrates with a low-energy mass-selected ion beam system using hexamethyldisilane (HMD) as gas source. In this study, one of the fragment ions produced from HMD, SiCH4+, was mass-selected. The energy approximately 100 eV. Then, SiCH4+ were irradiated Si(100) substrate. When temperature substrate set at 800 °C during irradiation, X-ray diffraction and Raman spectroscopy...

Fragment ions produced from dimethylsilane with a hot tungsten wire (i.e., catalyzer) in catalytic chemical vapor deposition (Cat-CVD, which is also known as CVD) processes are identified use of low-energy mass analyzed ion beam system. The analysis shows that dominant fragment H 1 + , 2 CH 3 Si SiH SiCH 4 SiC and 7 . energy distributions these measured. It found the spreads narrow no energetic produced, suggesting unlikely to cause any significant damage deposited films actual Cat-CVD...

Abstract Sputtering yields and surface modification of poly(methyl methacrylate) (PMMA) by mono-energetic ion beams and/or vacuum ultraviolet (VUV) light are studied with the use a low-energy mass-selected beam system. PMMA Ar + or <?CDATA ${\rm CF}_3^+$ ?> obtained as functions incident energy below 500 eV. It is found that due to incidence limited region near film surface, whereas seen in relatively deeper film, where partially carbonized diamond-like carbon (DLC) formed. Under conditions...

Sputtering yields of magnesium oxide (MgO) by He and Ar ion bombardment were measured at relatively low incident energies with monochromatic beams generated a low-energy mass-selected beam system. The sputtering their energy dependence are found to be significantly different from those proposed an earlier study based on numerical simulations [S. J. Yoon I. Lee: Appl. Phys. 91 (2002) 2487], which seems the only source MgO yield data widely available in community for wide range energies. Given...

A new Heusler alloy, Fe2CrSi, which has high spin polarization (P), low saturation magnetization (Ms), and a Curie temperature (TC), was investigated in order to fabricate high-performance magnetic tunnel junctions (MTJs) with magnetoresistance ratio critical current for the spin-transfer switching method, or field thermally assisted reversal technique. The main results are as follows: (1) P moment of Fe2CrSi an L21 structure were 0.98 1.98μB∕f.u., respectively, according density states...

Sputtering yields of gold (Au) by noble gas (He, Ne, Ar, Kr or Xe) ions have been measured in the low injection energy range 25–200 eV. The yield data presented here were obtained from mass-selected ion beam sputtering experiments, which has a very narrow spread and contains no impurity ions. newly set, together with fitting functions for dependence on energy, provide an accurate reliable database study fundamental physical mechanisms phenomena at energies, where experimental had scarce.

Surface modification of poly(methyl methacrylate) (PMMA) films by hydrogen-plasma exposure has been studied in the light sputtering resistance polymer-based materials plasma etching processes. measurements PMMA were performed with X-ray photoelectron spectroscopy, Fourier transform infrared Raman and spectroscopic ellipsometry. It found that oxygen atoms are preferentially removed from surface when a film is subjected to exposure, depth being about 40 nm case we examined. Hydrogen-plasma...

Barrier coating materials used in plasma display panel (PDP) cells strongly affect the discharge voltages. Although magnesium oxide (MgO) is widely for barrier current generation of commercial PDP cells, other alkaline earth oxides have been studied as alternatives and indeed some them are now known to lower breakdown voltages which would increase energy efficiency cells. On hand, resistance against physical sputtering another critical parameter coating. In this work, yields CaO, SrO BaO by...

In this paper, we report a high-temperature exchange bias (EB) effect in melt-spun Mn55Bi45 alloy ribbons. A remarkable spontaneous (up to 1700 Oe) was achieved at temperature from 300 K 550 K, which is far higher than what has so been observed other systems. Such phenomenon attributed the local antiferromagnetic cluster formed ferromagnetic matrix. The observation of EB interest perspective practical applications, and it good starting point for designing spintronic devices.

A new magnetic force microscopy (MFM) technique for measuring alternating field (ac field) was proposed by using frequency modulation (FM) phenomenon of tip oscillation. We detected a narrowband FM in the oscillation high-coercivity MFM applying an ac to metal-in-gap (MIG) type ring head. In experiment, driven at constant fc near resonant cantilever piezoelectric element, and with fm up 10 kHz applied tip. Two sideband spectra fc±fm were observed field. The intensity increased linearly...

In magnetic force microscopy (MFM), the tip–sample distance should be reduced to analyze microscopic domain structure with high spatial resolution. However, achieving a small has been difficult because of superimposition interaction forces such as van der Waals and electrostatic induced by sample surface. this study, we propose new method MFM using ferromagnetic resonance (FMR) extract only field near method, magnetization cantilever is modulated FMR separate topographic structure. We...

Abstract (Bi 1−x La x )(Fe,Co)O 3 multiferroic magnetic film were fabricated using pulsed DC (direct current) sputtering technique and demonstrated magnetization reversal by applied electric field. The 0.41 0.59 )(Fe 0.75 Co 0.25 )O films exhibited hysteresis curves of both ferromagnetic ferroelectric behavior. saturated ( M s ) the was about 70 emu/cm . squareness S (= remanent r )/ coercivity H c perpendicular to plane are 0.64 4.2 kOe which larger compared with in parallel 0.5 2.5 kOe....

We found that the atomic-concentration-ratio of carbon to silicon (C/Si ratio) in carbide (SiC) films formed by thermal chemical vapor deposition (CVD) was much greater than 1 when source gas for CVD dimethylsilane (DMS). Thus, we tried change carbon-inclusion levels film injecting some ion beams into a depositing SiC during process with DMS. Three beams, i.e., Si+, SiCH5+, or C+ ions were injected films. The energy and 110 eV. temperature substrate 800 °C. X-ray diffraction deposited showed...

High resolution imaging of ac magnetic field from a trailing-edge shielded perpendicular writing head was demonstrated by using frequency-modulated force microscopy (FM-MFM) with high-coercivity FePt MFM tip. The distribution gradient the recording is presented and can be used to evaluate performance head. A Fourier analysis images suggests that spectral features as small 15 nm should detectable FM-MFM technique high coercivity enhancement in spatial very crucial for nanoscale shed light on...

Although MgO is widely used for barrier coating in the current generation of commercial plasma display panel (PDP) cells, other alkaline earth oxides have been studied as alternatives to because some them lower discharge breakdown voltages PDP which would increase energy efficiency cells. On hand, resistance against physical sputtering another critical parameter coating. In this work, yields CaO, SrO, and BaO by monochromatic He + , Ar or Kr ion beams normal incidence obtained experimentally...