The direct collisional interaction of magnetospheric particles with Io will lead to sputtering of atoms and molecules from the satellite into circum-Jovian space. The -•520-eV S (and -•260-eV O) ions composing the Io toms are the most effective agents for net sputter emoval of matter from the satellite. An incident flux of-•10 •ø cm -2 s -• is estimated to provide -•5 x 10 •ø S atoms cm -2 s -•...

CHARACTERIZATION AND CORROSION OF BCC-TANTALUM COATING DEPOSITED ON ALUMINUM AND STEEL SUBSTRATE BY DC MAGNETRON SPUTTERING by Chirag Joshi Tantalum is one of the most versatile highly refractory corrosion-resistant metals. Tantalum coating can be used as an effective corrosion barrier if it is continuous, free from defects and it adheres well to the substrate. A DC magnetron sputtering techniq...

Electronic excitation of thin films of molecular and rare gas solids by MeV He and H ions is efficient in causing sputtering. The sputtering yields vary widely for different species, even for those with very similar surface binding energy. The sputtering yields for CO, Ar, and N,, for example, differ by a factor of 10. Even more striking for these three is the dependence of the sputtering yield...

A series of Co/Pd multilayers were made by dc magnetron sputter deposition on Al foil substrates. For these multilayered samples, Co layer thicknesses were less than 4 A and Pd layers were varied from 4 to 22 A. Sputtering rates were controlled by either sputtering power (10-50 W) or Ar sputtering pressure (3-15 mTorr). In both cases, lower deposition rates yielded higher perpendicular coercivi...

The magnetic properties of 1 nm thick in-plane anisotropic Co ultrathin film on ZnO(0001) were investigated through successive 500 eV nitrogen-ion sputtering. Magneto-optical Faraday effects were used to observe the evolution of the ion-irradiated sample in longitudinal and perpendicular magnetic fields. The ferromagnetic phase of the initial in-plane anisotropic fcc β-Co phase transformation t...

We have investigated the effects of sputtering Ar gas pressure on magnetic and magneto-optical properties in compositionally modulated Co/Pd thin films. The samples were prepared by dc magnetron sputtering from 2-in.-diam Co and Pd targets by alternately exposing the substrates to targets. Sputtering Ar gas pressure was varied from 2 to 30 mTorr. All samples had same bilayer thicknesses compose...

The sputtering of low temperature rare-gas and molecular-gas solids by ion bombardment occurs through two different routes. Collision cascades initiated by momentum transferring collisions of ions with atoms of the solid are effective as they are in metals. The apparent surface binding energy is, however, much lower than the sublimation energy and there is a substantial low energy component to ...

We study the production of SiO in the gas phase of molecular outflows, through the sputtering of Si-bearing material in grains. The sputtering is driven by neutral particle impact on charged grains in C-type shocks, at the speed corresponding to ambipolar diffusion. Shock speeds in the range 10 < vs < 40 km s−1 and preshock densities 104 < nH < 107cm−3 have been investigated. Sputtering of Si-b...

Morphology evolution of the multicomponent metallic glass film obtained by radio frequency (RF) magnetron sputtering was investigated in the present work. Two modes of metallic glass sputtering were distinguished: smooth film mode and clustered film mode. The sputtering parameters, which have the most influence on the sputtering modes, were determined. As a result, amorphous Ni-Nb thin films wi...

Lithium evaporation treatments in the National Spherical Torus Experiment (NSTX) have shown dramatic improvements in plasma performance increasing the viability of lithium as a Plasma Facing Component (PFC) material. In order to understand the complex system of lithiated ATJ graphite, chemical sputtering measurements of plain and lithiated ATJ graphite are conducted in our upgraded IIAX (Ion Su...