MAGNETIC WRITE HEAD CHARACTERIZATION WITH NANO-METER RESOLUTION USING NITROGEN VACANCY COLOR CENTERS

摘要

A crystal film with one or more nitrogen vacancy centers is placed in close proximity to a recording head. A magnetic field or heat produced by the recording head as well as excitation illumination and an excitation field is applied to the crystal film. The magnetic field produced by the recording head, the heat produced by a thermal device on the recording head, and/or the excitation field may be varied. A confocal microscope or wide-field microscope optically detects a decrease in a spin dependent photoluminescence in response to the magnetic field or heat, excitation field and excitation illumination caused by electron spin resonance (ESR) of the at least one nitrogen vacancy center to measure Optically Detected Spin Resonance (ODMR). A characteristic of the recording head is determined using the ODMR.

主权项

1. A method comprising:
providing a bias signal to a recording head that includes a write pole to produce a magnetic field from the recording head, wherein a crystal film with nitrogen vacancy centers is positioned in the magnetic field; providing an excitation field to the crystal film; producing excitation illumination that is incident on the crystal film; measuring Optically Detected Spin Resonance (ODMR) by detecting a decrease in a spin dependent photoluminescence in response to the magnetic field, the excitation field and the excitation illumination caused by electron spin resonance (ESR) of the nitrogen vacancy centers; and determining a characteristic of the recording head using the ODMR.