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AJA International Orion Series Argon Ion Mill - Ion mills etch samples by direct physical sputtering of material using a large diameter, neutral beam of Argon ions incident on the substrate surface at an angle to prevent redeposition of the sputtered material. Since the etching process is physical rather than chemical, it is applicable to a wide range of sample materials. Argon milling produces smooth surfaces the shape of which may be defined photolithographically. The Orion mill has a water cooled, rotating (0 – 20 RPM) substrate holder that accepts up to 4” diameter substrates. The ion energy is adjustable from 100 eV to 1200 eV at currents up to 120 mA. The incident angle of the beam to the substrate surface can be varied over -/+ 90° to optimize the etch rate and sidewall definition.