Magnetic Transducer Insertion Layer for Shield Spacing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic read transducers face challenges in achieving improved thermal stability and higher magnetoresistive effects while reducing shield-to-shield spacing, which is essential for advancing hard disk drive technology.
Innovation Solution
The implementation of a magnetic transducer design that includes a magnetic shield with a textured and large grain size, an insertion layer that is nonmagnetic and structurally coupled with an antiferromagnetic layer, allowing for magnetic decoupling and reduced thickness, and a nonmagnetic spacer layer to maintain performance at a lower shield-to-shield spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shield-to-shield spacing is reduced to advance hard disk drive technology, then higher density recording is achieved, but thermal stability and magnetoresistive performance of the sensor deteriorate
Solution Approach 1:
A nonmagnetic insertion layer is introduced between the magnetic shield and the antiferromagnetic layer to act as an intermediary that magnetically decouples the AFM layer from the shield while maintaining structural coupling. This allows the AFM layer to be thinner (improving thermal stability) while still being supported by the shield structure, thereby enabling reduced shield-to-shield spacing without sacrificing sensor performance.
Solution Approach 2:
The invention changes the magnetic coupling parameter by introducing a nonmagnetic insertion layer that alters the magnetic interaction between the shield and AFM layer. This parameter change allows the AFM layer thickness to be reduced while maintaining adequate thermal stability, thus enabling smaller shield-to-shield spacing for higher density recording.
2Reliability
If the AFM layer thickness is reduced to improve thermal stability, then thermal stability is improved, but structural coupling with the magnetic shield deteriorates
Solution Approach 1:
The nonmagnetic insertion layer serves as a mediator that maintains structural coupling between the thin AFM layer and the magnetic shield while preventing harmful magnetic interaction. This intermediary allows the AFM layer to be sufficiently thin for improved thermal stability while still being structurally supported by the shield through the insertion layer.
Solution Approach 2:
The interface between the magnetic shield and AFM layer is segmented by introducing the nonmagnetic insertion layer. This segmentation separates the structural support function (performed by the shield through the insertion layer) from the magnetic interaction function (blocked by the nonmagnetic insertion layer), allowing the AFM layer to be thinner without compromising structural coupling.
3Length of stationary object
If a conventional nonmagnetic layer and seed layer are used between the magnetic shield and AFM layer, then structural support is provided, but the combined thickness is too large to achieve reduced shield-to-shield spacing
Solution Approach 1:
The invention merges the functions of the conventional nonmagnetic layer and seed layer into a single nonmagnetic insertion layer. This insertion layer simultaneously provides structural support (replacing the seed layer function) and magnetic decoupling (replacing the nonmagnetic layer function), thereby reducing the combined thickness while maintaining all necessary functions.
Solution Approach 2:
The nonmagnetic insertion layer is designed to perform multiple functions: it provides structural support to the AFM layer, magnetically decouples the AFM layer from the shield, and maintains structural coupling. This multi-functionality replaces what were previously separate layers, reducing overall complexity and thickness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables a reduction in shield-to-shield spacing while maintaining thermal stability and magnetoresistive performance, making it suitable for higher density recording applications.
Implementation Method 1
The insertion layer has a thickness that is sufficiently large that the AFM layer is magnetically decoupled from the magnetic shield
Implementation Method 2
The conventional AFM layer 20 is typically seventy to eighty Angstroms, or more, in thickness and is used to pin, or fix the direction of, the magnetization of the conventional pinned layer 22
Implementation Method 3
improved thermal stability of the conventional sensor 18 as well as a higher magnetoresistive effect for the sensor 18 are still desired
Data Source
AI summary
A method and system for providing a magnetic transducer is described. The method and system include providing a magnetic shield, an insertion layer on the magnetic shield, an antiferromagnetic (AFM) layer, a pinned layer magnetically coupled with the AFM layer, a nonmagnetic spacer layer, and a free layer. The magnetic shield has a texture and a grain size. The insertion layer has a thickness that is sufficiently large that the AFM layer is magnetically decoupled from the magnetic shield and sufficiently small that the AFM layer is structurally coupled with the magnetic shield. The pinned layer resides between the AFM layer and the nonmagnetic spacer layer. The nonmagnetic spacer layer resides between the free layer and the pinned layer.