Multilayer Spin Torque Element with Positive and Negative Beta Materials
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Solution Overview
Problem
Current magnetic recording technologies, such as MAMR, face challenges in achieving high recording density while maintaining reliability due to the limitations of existing spin torque elements.
Innovation Solution
A magnetic recording head design incorporating a dual layer spin torque structure with spacer layers, where one magnetic layer has positive polarization and the other negative polarization, maximizing torque opposite to the gap field, enhancing recording density and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single layer spin torque structure is used, then the device complexity is low, but the torque generation and recording density are insufficient
Solution Approach 1:
The spin torque element is divided into multiple layers (first spin torque layer with negative beta material, second spin torque layer with positive beta material, and third spin torque layer with positive beta material) instead of using a single layer structure. This segmentation allows each layer to contribute differently to torque generation, maximizing the overall torque effect and enabling higher recording density while managing complexity through functional division
Solution Approach 2:
The patent uses composite material structure combining different beta materials (negative beta and positive beta materials) in a multilayer configuration. This composite approach leverages the complementary properties of different materials to enhance torque generation efficiency, where the interaction between positive and negative beta materials creates synergistic effects that improve recording density beyond what single materials can achieve
2Manufacturing precision
If spin torque element is added to improve recording density, then the areal density capability increases, but the device structure becomes more complex
Solution Approach 1:
The spin torque element is integrated into the existing magnetic head structure by merging it with the write pole and shield components. The spin torque element is positioned adjacent to the write pole, combining the writing function and spin torque generation function in a unified structure, thereby improving areal density capability without requiring completely separate device components
Solution Approach 2:
The patent introduces a vertical multilayer dimension to the spin torque element structure, stacking multiple functional layers (negative beta layer, positive beta layers, spacer layers) in the thickness direction. This dimensional approach allows compact integration of complex functionality within a small volume, enhancing areal density capability while controlling the horizontal footprint and overall structural complexity
3Force
If multilayer spin torque structure with positive and negative beta materials is used, then torque is maximized opposite to gap field, but the manufacturing precision requirements increase
Solution Approach 1:
Different regions of the spin torque element are assigned different material properties: the first spin torque layer uses negative beta material while the second and third layers use positive beta materials. This local differentiation of material quality allows each layer to contribute optimally to torque generation in its specific position, maximizing the overall torque effect opposite to the gap field while managing manufacturing precision through localized material selection
Solution Approach 2:
Spacer layers are introduced as intermediary elements between the different beta material layers. These spacer layers mediate the interaction between the negative and positive beta materials, providing structural separation and optimizing the magnetic coupling between layers. This intermediary approach enables precise control of layer interactions and reduces manufacturing precision requirements by providing buffer zones that accommodate fabrication tolerances
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
The design improves areal density capability and writing performance by maximizing torque in the spacer layers, leading to better magnetic recording density and reliability.
Implementation Method 1
The spin torque element includes a dual layer spin transfer structure that is spaced from magnetic layers on either side using spacer layers. One magnetic layer that faces a positive polarizer has a positive polarization while another magnetic layer facing the negative polarizer has a negative polarization. As such, torque in the spacer layers is maximized when the direction of the magnetization in the STL is opposite to the gap field.
Data Source
AI summary
The present disclosure generally relates to a spin torque element disposed between a main pole and a shield in a magnetic recording head. The shield could be a trailing shield, a side shield, or a leading shield. The spin torque element includes a dual layer spin transfer structure that is spaced from magnetic layers on either side using spacer layers. One magnetic layer that faces a positive polarizer has a positive polarization while another magnetic layer facing the negative polarizer has a negative polarization. As such, torque in the spacer layers is maximized when the direction of the magnetization in the STL is opposite to the gap field.