Magnetic Head Stacked Body for High Density Recording
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Solution Overview
Problem
Magnetic heads face challenges in achieving high recording density due to the magnetic field emitted from the pole being directly oriented towards the shield, making it difficult for the field to effectively reach the recording medium, especially when the write gap is small.
Innovation Solution
A magnetic head design incorporating a stacked body with specific layers (including Fe, Co, Ni, Cr, V, Mn, Ti, Sc, Cu, and Au) between the magnetic pole and the shield, which reverses the orientation of the magnetization of the first layer, allowing the magnetic field to be effectively applied to the recording medium, even with a small write gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the write gap is reduced to increase recording density, then the recording density is improved, but the magnetic field is directly oriented towards the shield and cannot effectively reach the recording medium
Solution Approach 1:
A stacked body comprising multiple magnetic layers is introduced as an intermediary between the magnetic pole and the shield. This stacked body has a thickness of 1 nm to 10 nm and includes alternating ferromagnetic and non-magnetic layers, which serves as a mediator to control and redirect the magnetic field orientation towards the recording medium while maintaining a small write gap for high recording density.
Solution Approach 2:
The stacked body is constructed using composite material structure with alternating ferromagnetic layers (containing Fe, Co, Ni) and non-magnetic layers (containing Ru, Rh, Ir, Pt, Pd, Cu, Ag, Au, or their alloys). This composite structure enables precise control of magnetic field penetration and orientation, allowing the magnetic field to effectively reach the recording medium even when the write gap is minimized for high-density recording.
2Ease of operation
If a stacked body with multiple layers is introduced to control magnetic field orientation, then the magnetic field application is improved, but the device structure becomes more complex
Solution Approach 1:
The stacked body parameters are precisely controlled: total thickness of 1 nm to 10 nm, with each ferromagnetic layer being 0.3 nm to 3 nm thick and each non-magnetic layer being 0.3 nm to 2 nm thick. By controlling these dimensional parameters and the number of repetitions (1 to 10 times), the magnetic field orientation is effectively controlled without requiring excessive structural complexity.
Solution Approach 2:
Different regions of the stacked body have different magnetic properties - ferromagnetic layers provide magnetic field generation and direction control, while non-magnetic layers provide spacing and field penetration control. This local differentiation of material properties within the stacked body enables precise magnetic field management with relatively simple overall structure.
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 enhances the recording density by ensuring that the magnetic field is oriented towards the recording medium, rather than being absorbed by the shield, thereby improving the magnetic field application and recording efficiency.
Implementation Method 1
the stacked body includes a first layer including at least one first element selected from the group consisting of Fe, Co, and Ni... reverses the orientation of the magnetization of the first layer, allowing the magnetic field to be effectively applied to the recording medium
Data Source
AI summary
According to one embodiment, a magnetic head includes a magnetic pole, and a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, a second layer and a third layer. The first layer includes at least one first element selected from the group consisting of Fe, Co, and Ni. The second layer is provided between the magnetic pole and the first layer, and includes at least one second element selected from the group consisting of Cr, V, Mn, Ti, and Sc. The third layer is provided between the first layer and the first shield, and includes at least one third element selected from the group consisting of Cr, V, Mn, Ti, and Sc.