FeCo Multilayer Recording Head Structure for Targeted Switching
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Solution Overview
Problem
Existing magnetic recording heads face challenges in achieving targeted high-density magnetic switching with low coercivity, leading to unintentional switching of neighboring grains and excessive energy consumption due to non-uniform magnetic fields.
Innovation Solution
The implementation of a multilayer structure in magnetic recording heads, comprising an iron-cobalt (FeCo) layer with a body-centered cubic (BCC) crystalline structure, a first crystalline layer of a specific alloy, and a second crystalline layer of chromium (Cr) with a BCC texture, facilitates targeted switching and low coercivity by reducing intergranular exchange coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ferromagnetic materials with small grains are used to facilitate softer magnetic responses, then magnetic switching becomes easier, but non-uniform magnetic fields cause non-uniform switching of grains leading to unintentional switching of neighboring grains
Solution Approach 1:
The patent applies local quality by creating a non-uniform magnetic field with a concentrated tip region that focuses the switching effect on specific targeted grains while leaving neighboring grains unaffected. The field strength varies spatially, being strongest at the tip and decreasing away from it, which enables selective switching of only the intended grains even in the presence of intergranular exchange coupling.
2Measurement precision
If non-uniform magnetic fields are used for targeted switching, then specific grains can be switched, but excessive energy is expended due to unintentional switching of neighboring grains
Solution Approach 1:
The patent employs parameter changes by adjusting the magnetic field distribution parameters - specifically creating a highly localized field with a sharp gradient that concentrates energy only where needed. By optimizing the field geometry and strength distribution, the patent achieves precise grain switching with minimal energy expenditure, avoiding the energy waste associated with unintentional switching of neighboring grains.
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 configuration enhances writing efficiency, reduces pole erasure and cross-track interference, and allows for the use of soft shield materials, resulting in improved operational efficiency and increased recording density.
Implementation Method 1
non-uniform magnetic fields can result in non-uniform switching of grains where the grains are intergranularly exchange coupled
Data Source
AI summary
Aspects of the present disclosure generally relate to magnetic recording heads (such as write heads of data storage devices) that include multilayer structures to facilitate targeted switching and relatively low coercivity. In one or more embodiments, a magnetic recording head includes an iron-cobalt (FeCo) layer having a crystalline structure that is a cubic lattice structure, a first crystalline layer formed of a first material, and a second crystalline layer between the first crystalline layer and the FeCo layer. The second crystalline layer is formed of a second material different from the first material, and the second crystalline layer interfaces both the FeCo layer and the first crystalline layer. The crystalline structure of the FeCo layer has a texture of <100>.