Multilayered structures comprising magnetic nano-oxide layers for current perpendicular to plane GMR heads
First Claim
1. A magnetic nano-oxide based current-perpendicular-to-plane (CPP) magnetoresistive (MR) sensor stack having increased perpendicular resistance and enhanced magnetoresistive properties, comprising:
- a substrate;
a first metallic, non-magnetic spacer layer formed upon said substrate;
a first ferromagnetic layer formed upon said first metallic non-magnetic spacer layer;
a first magnetic nano-oxide layer formed upon said first ferromagnetic layer;
a second metallic, non-magnetic spacer layer formed on said first magnetic nano-oxide layer;
a second magnetic nano-oxide layer formed upon said second metallic, non-magnetic spacer layer;
a second ferromagnetic layer formed upon said second magnetic nano-oxide layer;
a third metallic, non-magnetic spacer layer formed upon said second ferromagnetic layer.
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Abstract
Nano-oxide based current-perpendicular-to-plane (CPP) magnetoresistive (MR) sensor stacks are provided, together with methods for forming such stacks. Such stacks have increased resistance and enhanced magnetoresistive properties relative to CPP stacks made entirely of metallic layers. Said enhanced properties are provided by the insertion of magnetic nano-oxide layers between ferromagnetic layers and non-magnetic spacer layers, whereby said nano-oxide layers increase resistance and exhibit spin filtering properties. CPP sensor stacks of various types are provided, all having nano-oxide layers formed therein, including the spin-valve type and the synthetic antiferromagnetic pinned layer spin-valve type. Said stacks can also be formed upon each other to provide laminated stacks of different types.
11 Citations
8 Claims
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1. A magnetic nano-oxide based current-perpendicular-to-plane (CPP) magnetoresistive (MR) sensor stack having increased perpendicular resistance and enhanced magnetoresistive properties, comprising:
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a substrate; a first metallic, non-magnetic spacer layer formed upon said substrate; a first ferromagnetic layer formed upon said first metallic non-magnetic spacer layer; a first magnetic nano-oxide layer formed upon said first ferromagnetic layer; a second metallic, non-magnetic spacer layer formed on said first magnetic nano-oxide layer; a second magnetic nano-oxide layer formed upon said second metallic, non-magnetic spacer layer; a second ferromagnetic layer formed upon said second magnetic nano-oxide layer; a third metallic, non-magnetic spacer layer formed upon said second ferromagnetic layer. - View Dependent Claims (2, 3)
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4. A method of forming magnetic nano-oxide based current-perpendicular-to-plane (CPP) magnetoresistive (MR) sensor stack having increased perpendicular resistance and enhanced magnetoresistive properties, comprising:
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providing a substrate; forming upon said substrate a first metallic, non-magnetic spacer layer; forming upon said first metallic non-magnetic spacer layer a first ferromagnetic layer; forming upon said first ferromagnetic layer a first magnetic nano-oxide layer; forming upon said first magnetic nano-oxide layer a second metallic, non-magnetic spacer layer; forming upon said second metallic, non-magnetic spacer layer a second magnetic nano-oxide layer; forming upon said second magnetic nano-oxide layer a second ferromagnetic layer; forming upon said second ferromagnetic layer a third metallic, non-magnetic spacer layer. - View Dependent Claims (5, 6, 7, 8)
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Specification