Heat-assisted rotating disk magnetometer for ultra-high anisotropy magnetic measurements

摘要

An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to measure one or more magnetic properties of the track using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

主权项

1. An apparatus, comprising:
a spindle configured to rotate a magnetic recording medium; a magnetic field generator configured to expose a track of the medium to a DC magnetic field, the generator configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode; a laser arrangement configured to heat the track during the erase mode and, during the writing mode, heat the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon; a reader configured to read the magnetic pattern and generate a read signal; and a processor coupled to the reader and configured to measure one or more magnetic properties of the track using the read signal.