Systems and methods for measuring ambient and laser temperature in heat assisted magnetic recording
First Claim
1. A system for measuring temperature in a heat assisted magnetic recording, the system comprising:
- a slider comprising a write head;
a laser diode coupled to the slider and configured to direct energy to a magnetic medium; and
a preamplifier circuit comprising;
a voltage measurement circuit configured to measure a voltage drop across the laser diode; and
a current measurement circuit configured to measure a current through the laser diode;
wherein the preamplifier circuit is configured to;
store calibration information comprising a plurality of temperatures corresponding with measurements of the voltage drop across the laser diode and measurements of the current through the laser diode; and
calculate a temperature based on the measured voltage drop across the laser diode, the measured current through the laser diode, and the calibration information.
8 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for measuring ambient and laser temperature in heat assisted magnetic recording (HAMR) systems are provided. One such system includes a slider having a write head, a laser diode coupled to the slider and configured to direct energy to a magnetic medium, and a preamplifier circuit including a voltage measurement circuit configured to measure a voltage drop across the laser diode, and a current measurement circuit configured to measure a current through the laser diode, where the preamplifier circuit is configured to store calibration information including a plurality of temperatures corresponding with measurements of the voltage drop across the laser diode and measurements of the current through the laser diode, and calculate a temperature based on the measured voltage drop across the laser diode, the measured current through the laser diode, and the calibration information.
-
Citations
18 Claims
-
1. A system for measuring temperature in a heat assisted magnetic recording, the system comprising:
-
a slider comprising a write head; a laser diode coupled to the slider and configured to direct energy to a magnetic medium; and a preamplifier circuit comprising; a voltage measurement circuit configured to measure a voltage drop across the laser diode; and a current measurement circuit configured to measure a current through the laser diode; wherein the preamplifier circuit is configured to; store calibration information comprising a plurality of temperatures corresponding with measurements of the voltage drop across the laser diode and measurements of the current through the laser diode; and calculate a temperature based on the measured voltage drop across the laser diode, the measured current through the laser diode, and the calibration information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for measuring temperature in a heat assisted magnetic recording, the method comprising:
-
storing calibration information comprising a plurality of temperatures corresponding with measurements of a voltage drop across a laser diode and measurements of a current through the laser diode; providing a preselected current to the laser diode; measuring a voltage drop across the laser diode; measuring a current through the laser diode; calculating a temperature based on the measured voltage drop across the laser diode, the measured current through the laser diode, and the calibration information; determining an adjusted current to be supplied to the laser diode based on the calculated temperature; and writing information to a magnetic medium using a write head while the adjusted current is supplied to the laser diode, wherein the laser diode is configured to direct light energy on to the magnetic medium. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
Specification