Patent ID: 7684145

Claim:
A metrology system for measuring the magnetic properties of a device used for perpendicular recording, the device having a first side having a magnetic recording medium layer thereon, the system comprising: a macroscopic recording head communicating with a computer, the macroscopic recording head comprising a yoke and at least one magnetic field generating element for generating a magnetic field, the yoke having a first magnetic pole capable of being positioned above the first side of the device having a magnetic recording medium layer thereon and a second magnetic pole capable of being positioned opposite the first magnetic pole and below a second side of the device, the positioning of the first and second magnetic poles providing magnetic flux closure through the device; a transport mechanism capable of communicating with the device and with the macroscopic recording head, the transport mechanism capable of positioning and movement of the device and the yoke relative to each other; a current applied to the magnetic field generating element of the macroscopic recording head, the current being sufficient to generate magnetic fields to create perpendicularly magnetized transitions in the magnetic recording media layer when the device is positioned between the first and second magnetic poles of the yoke and the transport mechanism effects movement of the device and the yoke relative to each other; and at least one read element above a side of the device having a magnetic recording medium layer thereon, the read element communicating with the transport mechanism and the read element translating the transitions recorded by the macroscopic recording head into signals for processing and analysis of the magnetic properties of the device.