Magnetic Head Multilayer Configuration Stabilizes Magnetization
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Solution Overview
Problem
Current magnetic recording devices face challenges in enhancing recording density due to instability in magnetization of magnetic poles and inefficient oscillation in magnetic elements.
Innovation Solution
A magnetic head design incorporating specific magnetic and non-magnetic layers, including a fourth magnetic layer with elements like Fe, Co, or Ni, and non-magnetic layers such as Cu, Au, Cr, Al, or Ag, which stabilize magnetization and facilitate high-intensity oscillation by spin torque, improving recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic head structure is used, then device complexity is low, but magnetization stability of magnetic poles deteriorates
Solution Approach 1:
The magnetic element is divided into multiple magnetic layers (first, second, third, and fourth magnetic layers) with different materials and functions. The first magnetic layer includes Fe, Co, or Ni for high magnetization, the second magnetic layer includes Fe, Co, or Ni and Cr, V, Mn, Ti, N, or Sc for oscillation, the third magnetic layer includes Fe, Co, or Ni for magnetization stability, and the fourth magnetic layer includes Fe, Co, or Ni and Cr, V, Mn, Ti, N, or Sc for spin torque oscillation. This segmentation allows each layer to perform its specific function optimally while maintaining overall system reliability.
Solution Approach 2:
The magnetic head employs composite material structures combining ferromagnetic materials (Fe, Co, Ni) with transition metals (Cr, V, Mn, Ti, N, Sc) in specific layer configurations. These composite structures create magnetic layers with tailored properties - the ferromagnetic materials provide high magnetization while the transition metal layers provide oscillation characteristics and spin torque effects, achieving both stability and functionality through material composition.
2Power
If conventional magnetic head structure is used, then manufacturing simplicity is maintained, but oscillation intensity of magnetic element deteriorates
Solution Approach 1:
The magnetic element is designed to produce dynamic oscillation rather than static magnetization. The second and fourth magnetic layers are specifically configured to generate oscillation through spin torque effects. The oscillation occurs in the magnetization direction of these layers, creating high-intensity dynamic behavior that enhances recording performance while the layered structure manages the complexity through functional specialization.
Solution Approach 2:
The patent optimizes parameters such as layer thickness, material composition ratios, and magnetic anisotropy to maximize oscillation intensity. By controlling the thickness of oscillation layers and the composition of magnetic and non-magnetic layers, the system achieves high-intensity oscillation while managing structural complexity through parameter optimization rather than simply adding more components.
3Productivity
If recording density is increased, then information capacity improves, but magnetization stability of magnetic poles deteriorates
Solution Approach 1:
Different regions of the magnetic element are assigned different material compositions and functions. The first and third magnetic layers use Fe, Co, or Ni for stable magnetization in regions requiring reliability. The second and fourth magnetic layers use Fe, Co, or Ni combined with Cr, V, Mn, Ti, N, or Sc for oscillation in regions requiring dynamic behavior. This local differentiation allows high recording density while maintaining stability where needed through spatially optimized material placement.
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 magnetic head achieves stable and high-intensity oscillation, enhancing recording density by stabilizing magnetization and optimizing spin torque interactions between magnetic layers.
Implementation Method 1
facilitate high-intensity oscillation by spin torque, improving recording density
Data Source
AI summary
According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a magnetic element provided between the first and the second magnetic poles. The magnetic element includes first to fourth magnetic layers, and first to fifth non-magnetic layers. The fourth magnetic layer includes a first element and at least one of Fe, Co or Ni. The first element including at least one selected from the group consisting of Cr, V, Mn, Ti, N and Sc. The fourth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag. The fifth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag.