PERPENDICULAR MAGNETIC RECORDING SYSTEM WITH AUXILIARY COIL AND CIRCUITRY FOR FAST SWITCHING OF WRITE POLE MAGNETIZATION
First Claim
1. A perpendicular magnetic recording write system for magnetizing regions in a perpendicular magnetic recording layer comprising:
- a write head comprisinga main pole;
a main electrically conductive coil coupled to the main pole for generating magnetic flux in the main pole;
an auxiliary pole; and
an auxiliary electrically conductive coil coupled to the auxiliary pole for generating magnetic flux in the auxiliary pole at an angle to the main pole greater than 15 degrees and less than or equal to 90 degrees;
a write driver capable of supplying write current in two directions to the main coil; and
circuitry coupled to the auxiliary coil for energizing the auxiliary coil when the write driver switches the direction of write current to the main coil.
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Accused Products
Abstract
A perpendicular magnetic recording system has a write head having a main coil (the write coil) and main pole (the write pole) that directs write flux in a direction perpendicular to the recording layer in the magnetic recording medium, and an auxiliary coil and auxiliary pole that injects magnetic flux into the write pole at an angle to the primary or perpendicular axis of the write pole. The additional flux from the auxiliary pole, which is injected non-parallel to the primary magnetization of the write pole, exerts a relatively large torque on the magnetization of the write pole, thereby facilitating magnetization reversal of the write pole. Electrical circuitry is connected to the main coil and the auxiliary coil to generate the auxiliary flux simultaneous with the switching of the magnetization of the write pole.
51 Citations
16 Claims
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1. A perpendicular magnetic recording write system for magnetizing regions in a perpendicular magnetic recording layer comprising:
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a write head comprising a main pole; a main electrically conductive coil coupled to the main pole for generating magnetic flux in the main pole; an auxiliary pole; and an auxiliary electrically conductive coil coupled to the auxiliary pole for generating magnetic flux in the auxiliary pole at an angle to the main pole greater than 15 degrees and less than or equal to 90 degrees; a write driver capable of supplying write current in two directions to the main coil; and circuitry coupled to the auxiliary coil for energizing the auxiliary coil when the write driver switches the direction of write current to the main coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A perpendicular magnetic recording write system for magnetizing regions in a perpendicular magnetic recording layer comprising:
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a write head comprising a main pole; a main electrically conductive coil coupled to the main pole for generating magnetic flux in the main pole; an auxiliary pole oriented substantially orthogonal to the main pole; and an auxiliary electrically conductive coil coupled to the auxiliary pole for generating magnetic flux in the auxiliary pole; a write driver for generating a primary signal to supply write current in two directions to the main coil; and circuitry coupled to the auxiliary coil for energizing the auxiliary coil when the write driver switches the direction of write current to the main coil, the circuitry comprising a high-pass filter for filtering from said primary signal a high-frequency component corresponding to the current-direction switching of the write current. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification