Magnetic recording read transducer having a laminated free layer
AssigneeWestern Digital (Fremont), LLC
InventorsCheng-Han Yang, Christian Kaiser, Yuankai Zheng, Qunwen Leng, Chih-Ching Hu
Life of this patent
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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 has a free layer including a plurality of ferromagnetic layers interleaved with and sandwiching at least one additional layer. Each of the ferromagnetic layers includes at least one of Fe, Co and B and has a first corrosion resistance. The additional layer(s) have a second corrosion resistance greater than the first corrosion resistance.
Claims18
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 free layer including a plurality of ferromagnetic layers interleaved with and sandwiching at least one additional layer, each of the plurality of ferromagnetic layers including B and at least one of Fe and Co, each of the ferromagnetic layers having a first corrosion resistance, the at least one additional layer has a second corrosion resistance greater than the first corrosion resistance, the at least one additional layer including at least one of NiFe, Ru, Ti, Mg, MgO, Ta, Cr and alumina, the free layer further including a magnetic layer including CoFe and adjoining one of the plurality of ferromagnetic layers.
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 free layer including a CoFe magnetic layer and a plurality of ferromagnetic layers interleaved with and sandwiching at least one additional layer, each of the plurality of ferromagnetic layers including CoxBy where x+y=1, x is less than 1, and y is less than or equal to 0.2 and greater than zero, the at least one additional layer including at least one of NiFe, Ru, Ti, Mg, MgO, Ta, Cr and alumina.
A disk drive comprising:
- a media;
- a slider including a magnetic read transducer having an air-bearing surface (ABS), the slider including a 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 free layer including a CoFe magnetic layer, a plurality of ferromagnetic layers interleaved with and sandwiching at least one additional layer, each of the plurality of ferromagnetic layers including B and at least one of Fe and Co and having a first corrosion resistance, the at least one additional layer having a second corrosion resistance greater than the first corrosion resistance, the at least one additional layer including at least one of NiFe, Ru, Ti, Mg, MgO, Ta, Cr and alumina.
A method for providing a magnetic transducer having an air-bearing surface (ABS) and comprising:
- providing a first shield;
- providing a second shield;
- and
- providing a read sensor between the first shield and the second shield, the read sensor including a free layer including a CoFe magnetic layer, a plurality of ferromagnetic layers interleaved with and sandwiching at least one additional layer, each of the plurality of ferromagnetic layers including B and at least one of Fe and Co and having a first corrosion resistance, the at least one additional layer having a second corrosion resistance greater than the first corrosion resistance, the at least one additional layer including at least one of NiFe, Ru, Ti, Mg, MgO, Ta, Cr and alumina, the CoFe magnetic layer adjoining one of the plurality of ferromagnetic layers.
Dependencies are inferred from the claim text.