Magnetic recording read transducer having a laminated free layer
First Claim
Patent Images
1. A magnetic transducer having an air-bearing surface (ABS) and comprising:
- a first shield;
a second shield; and
a read sensor between the first shield and the second shield, the read sensor including a pinned layer, a nonmagnetic spacer layer and a free layer, the nonmagnetic spacer layer being between the pinned layer and the free layer, the free layer including a plurality of ferromagnetic layers interleaved with and sandwiching a plurality of nonmagnetic layers, the plurality of ferromagnetic layers being ferromagnetically aligned, the plurality of ferromagnetic layers consisting of a single material, the plurality of ferromagnetic layers being a plurality of CoB layers.
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Abstract
A method and system provide a magnetic transducer including a first shield, a read sensor, and a second shield. The read sensor is between the first shield and the second shield. The read sensor includes a pinned layer, a nonmagnetic spacer layer and a free layer. The nonmagnetic spacer layer is between the pinned layer and the free layer. The free layer includes a plurality of ferromagnetic layers interleaved with and sandwiching a plurality of nonmagnetic layers. The plurality of ferromagnetic layers are ferromagnetically aligned.
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Citations
15 Claims
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1. A magnetic transducer having an air-bearing surface (ABS) and comprising:
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a first shield; a second shield; and a read sensor between the first shield and the second shield, the read sensor including a pinned layer, a nonmagnetic spacer layer and a free layer, the nonmagnetic spacer layer being between the pinned layer and the free layer, the free layer including a plurality of ferromagnetic layers interleaved with and sandwiching a plurality of nonmagnetic layers, the plurality of ferromagnetic layers being ferromagnetically aligned, the plurality of ferromagnetic layers consisting of a single material, the plurality of ferromagnetic layers being a plurality of CoB layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetic transducer having an air-bearing surface (ABS) and comprising:
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a first shield; a second shield; and a read sensor between the first shield and the second shield, the read sensor including a pinned layer, a nonmagnetic spacer layer and a free layer, the nonmagnetic spacer layer being between the pinned layer and the free layer, the free layer including a plurality of ferromagnetic layers interleaved with and sandwiching a single nonmagnetic layer, the plurality of ferromagnetic layers being ferromagnetically aligned and at least one of weakly ferromagnetically coupled, magnetically coupled and antiferromagnetically coupled, the plurality of ferromagnetic layers consisting of a single material, the plurality of ferromagnetic layers being a plurality of CoB layers.
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14. A magnetic transducer having an air-bearing surface (ABS) and comprising:
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a first shield; a second shield; and a read sensor between the first shield and the second shield, the read sensor including a pinned layer, a nonmagnetic spacer layer and a free layer, the nonmagnetic spacer layer being between the pinned layer and the free layer, the free layer including a CoFe layer, a plurality of CoB layers interleaved with and sandwiching a plurality of Ru layers, the plurality of CoB layers being ferromagnetically coupled through the plurality of Ru layers via a Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, the CoFe layer adjoining the nonmagnetic spacer layer and being between the plurality of CoB layers and the nonmagnetic spacer layer, each of the plurality of Ru layers having a thickness of at least three and not more than seven Angstroms, the plurality of CoB layers having a total thickness of at least fifty Angstroms and not more than eighty Angstroms, the plurality of CoB layers includes at least three and not more than seven CoB layers.
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15. A disk drive comprising:
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a media; a slider including a magnetic read transducer having an air-bearing surface (ABS), the slider including magnetic transducer having a first shield, a second shield, and a read sensor between the first shield and the second shield, the read sensor including a pinned layer, a nonmagnetic spacer layer and a free layer, the nonmagnetic spacer layer being between the pinned layer and the free layer, the free layer including a plurality of ferromagnetic layers interleaved with and sandwiching a plurality of nonmagnetic layers, the plurality of ferromagnetic layers being ferromagnetically coupled through the plurality of nonmagnetic layers, the plurality of ferromagnetic layers consisting of a single material, the plurality of ferromagnetic layers being a plurality of CoB layers.
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Specification