The DiskRam DLC Raman analyser for Hard Disk production QA

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The DiskRam Raman spectrograph from Jobin Yvon The DiskRam is a fast, compact and rugged Raman spectrograph dedicated to the at-line control of the diamond-like carbon (DLC) sputtering process for the Disk Drive Industry. As a module in combination with a robot disk handler or as a stand alone unit, DiskRam provides the rapid analysis of DLC coatings on hard disk drives. Simply place a disk manually on the sample chamber or have it placed by a sample handler robot and let DiskRam provide you complete automatic measurement and data analysis.

DiskRam features

Fast Raman analysis of DLC coatings on hard disk drive: Raman emission is excited by the 532 nm emission from a solid state Nd:YAG laser. A very high luminosity spectrograph is used to collect the full DLC spectrum within seconds.

Dedicated software for at line measurement with an immediate automatic curve fitting routine to measure G-band (graphitic carbon) and D-band (disordered carbon) as well as the luminescence background. These parameters are correlated to tribological properties as well as hydrogen and nitrogen content in DLC films.

Customized sample chamber based on a vacuum chuck mounted on a spindle device. For the measurement, the disk rests firmly on the vacuum chuck while the laser beam probes the downward face of the disk. This arrangement avoids the need for a trained operator to accurately adjust the focus on the disk surface because there is no defocusing of successive samples due to disk thickness variation. Thus, a robot may be used to automatically feed disks to the DiskRam for automated analysis.

Adjustable excitation/collection lens to accommodate different disk size. An off-angle excitation beam makes background correction due to reflected light unnecessary.

Large laser spot size . A large beam focus prevents damage to DLC films (laser irradiance is reduced by a factor of 500 compared to the microscope arrangement).

Computer - controlled spindle. This device allows one to analyze individual segments of the Disk, to obtain information on heterogeneity of the DLC film, or
a full ring at user-selected diameters, to obtain average DLC information

Either of these conditions prevent laser-induced damage of the DLC film.

Laser exposure security: Interlock blocks laser beam inside cabinet until safety cover has descended and enclosed disk.

The Ultimate Tool for Raman analysis on DLC films for the hard disk Industry