Compensation of laser diode introduced flying height changes
AssigneeHGST Netherlands B.V.
InventorsSripathi Vangipuram Canchi, Lidu Huang, Erhard Schreck
Life of this patent
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Abstract
Embodiments described herein generally relate to controlling the flying height of a slider. The methods can include transmitting radiation from a radiation source, determining a change in temperature, the change in temperature being the difference between a first temperature and an ambient temperature and changing the flying height of the slider and head based on the change in temperature. The devices generally include a head with a supporting surface and a media facing surface, a radiation source submount, a radiation source, and a temperature sensor positioned proximate the radiation source submount or the radiation source.
Claims16
A heat assisted magnetic recording (HAMR) head comprising:
- a head body comprising:
- a supporting surface;
- and
- a media facing surface positioned opposite the supporting surface;
- a radiation source submount positioned on the supporting surface;
- a radiation source positioned on the supporting surface, the radiation source being proximate the radiation source submount;
- a waveguide coupled between the support surface and the media facing surface;
- and
- a temperature sensor positioned a first distance from the radiation source submount, wherein the temperature sensor is positioned on the supporting surface, wherein the temperature sensor extends away from the media facing surface, wherein the first distance is between 5 nm and 100 nm.
A method for adjusting flying height comprising:
- transmitting radiation from a radiation source, the radiation source being connected with a slider and a radiation source submount, wherein the radiation source heats a first portion of the slider, wherein the slider includes a supporting surface and a media facing surface opposite the supporting surface;
- determining a first temperature, the first temperature corresponding to a temperature of the radiation source, wherein the first temperature is detected by a temperature sensor positioned a first distance from the radiation source submount, wherein the temperature sensor is positioned on the supporting surface, wherein the temperature sensor extends away from the media facing surface, wherein the first distance is between 5 nm and 100 nm;
- determining a second temperature, the second temperature being an ambient temperature;
- determining a change in temperature, the change in temperature being a difference between the first temperature and the second temperature;
- and
- changing the flying height of the slider based on the change in temperature.
Dependencies are inferred from the claim text.