Microwave-assisted magnetic recording (MAMR) head employing advanced current control to establish a magnetic resonance state
First Claim
1. A magnetic data storage system, comprising:
- a microwave-assisted magnetic recording (MAMR) head; and
a controller electrically coupled to the MAMR head for controlling operation of the MAMR head,wherein the MAMR head comprises;
a main pole configured to write data to a magnetic medium using a write magnetic field;
a write coil, wherein the write magnetic field is produced by the main pole upon a recording current, Iw, being provided to the write coil; and
a spin torque oscillator (STO) positioned near the main pole, the STO being configured to provide a high-frequency assistance magnetic field to the magnetic medium upon a STO drive current, ISTO, being provided to the STO, andwherein the controller is configured to;
determine a test signal to provide to the MAMR head to determine optimum recording conditions for the MAMR head and the magnetic medium, wherein the predetermined test signal omits current combinations where no STO oscillation occurs;
determine the optimum recording conditions for the MAMR head and the magnetic medium prior to performing a write operation based on alteration of ISTO and Iw via writing to the magnetic medium and subsequent reading from the magnetic medium of the predetermined test signal; and
ramp-up the STO drive current, ISTO, prior to providing the recording current, Iw, to the write coil in order to begin the write operation for writing data to the magnetic medium.
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Accused Products
Abstract
In one embodiment, a microwave-assisted magnetic recording (MAMR) head includes a main pole configured to write data to a magnetic medium using a write magnetic field, a write coil, wherein the write magnetic field is produced by the main pole upon a recording current, Iw, being provided to the write coil, and a spin torque oscillator (STO) positioned near the main pole, the STO being configured to provide a high-frequency assistance magnetic field to the magnetic medium upon a STO drive current, ISTO, being provided to the STO, wherein the STO drive current, ISTO, is ramped-up prior to the recording current, Iw, being provided to the write coil in order to begin a write operation for writing data to the magnetic medium. A method of operation for the MAMR head and an apparatus including the MAMR head are also described according to additional embodiments.
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Citations
20 Claims
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1. A magnetic data storage system, comprising:
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a microwave-assisted magnetic recording (MAMR) head; and a controller electrically coupled to the MAMR head for controlling operation of the MAMR head, wherein the MAMR head comprises; a main pole configured to write data to a magnetic medium using a write magnetic field; a write coil, wherein the write magnetic field is produced by the main pole upon a recording current, Iw, being provided to the write coil; and a spin torque oscillator (STO) positioned near the main pole, the STO being configured to provide a high-frequency assistance magnetic field to the magnetic medium upon a STO drive current, ISTO, being provided to the STO, and wherein the controller is configured to; determine a test signal to provide to the MAMR head to determine optimum recording conditions for the MAMR head and the magnetic medium, wherein the predetermined test signal omits current combinations where no STO oscillation occurs; determine the optimum recording conditions for the MAMR head and the magnetic medium prior to performing a write operation based on alteration of ISTO and Iw via writing to the magnetic medium and subsequent reading from the magnetic medium of the predetermined test signal; and ramp-up the STO drive current, ISTO, prior to providing the recording current, Iw, to the write coil in order to begin the write operation for writing data to the magnetic medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for using a microwave-assisted magnetic recording (MAMR) head, the method comprising:
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determining, using a controller of a magnetic data storage system, a test signal to provide to the MAMR head to determine optimum recording conditions for the MAMR head and a magnetic medium, wherein the predetermined test signal omits current combinations where no spin torque oscillator (STO) oscillation occurs; determining, using the controller, optimum recording conditions for the MAMR head and the magnetic medium prior to performing a write operation based on alteration of a STO drive current, ISTO, and a recording current, Iw, via writing to the magnetic medium and subsequent reading from the magnetic medium of the predetermined test signal; energizing the STO positioned near a main pole of the MAMR head to provide a high-frequency assistance magnetic field by providing the STO drive current, ISTO, to the STO; and energizing a write coil to produce a write magnetic field via the main pole by providing the recording current, Iw, to the write coil after waiting for a predetermined time delay such that the STO drive current, ISTO, is ramped-up prior to the recording current, Iw, being provided to the write coil in order to begin the write operation for writing data to the magnetic medium. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An apparatus, comprising:
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at least one microwave-assisted magnetic recording (MAMR) head, each MAMR head comprising; a main pole configured to write data to a magnetic medium using a write magnetic field; a write coil, wherein the write magnetic field is produced by the main pole upon a recording current, Iw, being provided to the write coil; and a spin torque oscillator (STO) positioned near the main pole, the STO being configured to provide a high-frequency assistance magnetic field to the magnetic medium upon a STO drive current, ISTO, being provided to the STO; the magnetic medium; a drive mechanism for passing the magnetic medium over the at least one MAMR head; and a controller electrically coupled to the at least one MAMR head for controlling operation of the at least one MAMR head, the controller being configured to; provide the STO drive current, ISTO, to the STO to provide the high-frequency assistance magnetic field; provide the recording current, Iw, to the write coil to produce the write magnetic field via the main pole; determine a test signal to provide to the at least one MAMR head to determine optimum recording conditions for the at least one MAMR head and the magnetic medium, wherein the predetermined test signal omits current combinations where no STO oscillation occurs; determine the optimum recording conditions for the MAMR head prior to performing a write operation based on alteration of ISTO and Iw via writing to the magnetic medium and subsequent reading from the magnetic medium of the predetermined test signal; ramp-up the STO drive current, ISTO, prior to providing the recording current, Iw, to the write coil in order to begin the write operation for writing data to the magnetic medium; and ramp-down the recording current, Iw, prior to reducing the STO drive current, ISTO, in order to cease the write operation for writing data to the magnetic medium.
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Specification