In an apparatus for fabricating a carbon coating, an object such as a magnetic recording medium is disposed on a side of an electrode connected to a high-frequency power supply. Ultrasonic vibrations are supplied to the object. Discharge is generated between the electrode connected to the high-frequency...http://www.google.es/patents/US6171674?utm_source=gb-gplus-sharePatente US6171674 - Hard carbon coating for magnetic recording medium
