MAGNETIC WRITE HEAD CHARACTERIZATION WITH NANO-METER RESOLUTION USING NITROGEN VACANCY COLOR CENTERS
First Claim
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.
0 Assignments
0 Petitions
Accused Products
Abstract
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.
-
Citations
85 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An apparatus comprising:
-
a biasing source configured to provide a bias signal; a probe card coupled to the biasing source and configured to be connected to a recording head that includes a write pole to provide the bias signal to the recording head that causes the recording head to produce a magnetic field; a light source that produces excitation illumination that is incident on a crystal film with nitrogen vacancy centers that is in the magnetic field produced by the recording head; a radio frequency antenna that provides an excitation field to the crystal film; a microscope configured to detect photoluminescence produced by the nitrogen vacancies in response to the excitation illumination; and a processor coupled to the microscope and configured to measure 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 determine a characteristic of the recording head using the ODMR. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method comprising:
-
providing a bias signal to a device that includes a thermal device that is controlled by the bias signal to produce heat, wherein a crystal film with nitrogen vacancy centers is positioned to be heated by the thermal device; 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 heat, the excitation field and the excitation illumination caused by electron spin resonance (ESR) of the nitrogen vacancy centers; and determining a characteristic of the device using the ODMR. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. An apparatus comprising:
-
a biasing source configured to provide bias signals; a probe card coupled to the biasing source and configured to be connected to a device that includes a thermal device, the probe card provides a bias signal to the device that causes the thermal device to heat a crystal film, the crystal film includes nitrogen vacancy centers; a light source that produces excitation illumination that is incident on the crystal film; a radio frequency antenna that provides an excitation field to the crystal film; a microscope configured to detect photoluminescence produced by the nitrogen vacancies in response to the excitation illumination; and a processor coupled to the microscope and configured to measure Optically Detected Spin Resonance (ODMR) by detecting a decrease in a spin dependent photoluminescence in response to the heat, the excitation field, and the excitation illumination caused by electron spin resonance (ESR) of the nitrogen vacancy centers; and determine a characteristic of the device using the ODMR. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
-
-
69. 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; scanning a probe having a probe tip comprising a crystal particle with at least one nitrogen vacancy center through the magnetic field produced by the recording head; providing an excitation field to the crystal particle; producing excitation illumination that is incident on the crystal particle; measuring Optically Detected Spin Resonance (ODMR) by detecting a decrease in a spin dependent photoluminescence in response to the excitation illumination caused by electron spin resonance (ESR) of the at least one nitrogen vacancy center; and determining a characteristic of the recording head using the ODMR. - View Dependent Claims (70, 71, 72, 73, 74, 75, 76)
-
-
77. An apparatus comprising:
-
a biasing source configured to provide a bias signal; a probe card coupled to the biasing source and configured to be connected to a recording head that includes a write pole to provide the bias signal to the recording head that causes the recording head to produce a magnetic field; a probe having a probe tip comprising a crystal particle with at least one nitrogen vacancy center, the probe configured to be scanned through the magnetic field produced by the recording head; a light source that produces excitation illumination that is incident on the crystal particle; a radio frequency antenna that provides an excitation field to the crystal particle; a microscope configured to detect photoluminescence produced by the at least one nitrogen vacancy in the crystal particle; a processor coupled to the microscope and configured to measure Optically Detected Spin Resonance (ODMR) by detecting a decrease in a spin dependent photoluminescence in response to the excitation illumination caused by electron spin resonance (ESR) of the at least one nitrogen vacancy center; and
determine a characteristic of the recording head using the ODMR. - View Dependent Claims (78, 79, 80, 81, 82, 83, 84, 85)
-
Specification