Determining head-to-disk contact and/or spacing using frequency domain signature of a temperature sensor

摘要

A high frequency, AC-modulated heater current is applied to a heater of a magnetic head. A resistance change of a temperature sensor located at a region of proximity to a magnetic media is determined. The resistance change occurs in response to the heater current. At least one of a spacing and contact between the magnetic head and the magnetic media is determined based on a frequency-domain signature of the resistance change.

主权项

1. A method comprising:
applying a high frequency, AC-modulated DC heater current to a heater of a magnetic head; determining a resistance change of a temperature sensor that is separate from the heater and located at a region of proximity to a magnetic media, the resistance change occurring in response to the heater current; and determining a spacing between the magnetic head and the magnetic media based on a frequency-domain signature of the resistance change.