Chromium Insertion Layer Spin Torque Oscillator for High Density Recording
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Solution Overview
Problem
Spin torque oscillators (STOs) face inefficiencies in magnetic recording due to low oscillation angles at high frequencies, limiting their ability to achieve high areal density capabilities in magnetic recording media.
Innovation Solution
Incorporating an insertion layer, such as chromium layers, within the STO structure between the field generation layer and the capping layer or between the field generation layer and the spacer layer, which increases the negative Hk, thereby enhancing the oscillation angles at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the main pole size is decreased to achieve higher recording density, then the recording density increases, but the writing field strength decreases
Solution Approach 1:
A spin torque oscillator is introduced as an intermediary component between the write pole and the magnetic recording medium. The STO generates a high-frequency AC magnetic field that mediates the writing process, enabling effective recording despite the reduced DC field strength from the smaller main pole.
Solution Approach 2:
The spin torque oscillator produces a periodic high-frequency AC magnetic field that is applied to the magnetic recording medium during the writing process. This periodic action reduces the effective coercivity of the medium, allowing the smaller main pole to successfully write data despite its limited field strength.
2Productivity
If the spin torque oscillator operates at high frequencies to enable effective magnetic recording, then the recording efficiency improves, but the oscillation angle decreases
Solution Approach 1:
The magnetic anisotropy energy (MAE) of the spin torque oscillator is optimized by adjusting material composition and layer thicknesses. This parameter change enables the STO to maintain larger oscillation angles at high operating frequencies, thereby improving recording efficiency without sacrificing the necessary angular amplitude.
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 improves the oscillation angles of the field generation layer at high frequencies, facilitating effective and efficient magnetic recording and increasing the areal density capability of magnetic recording media.
Implementation Method 1
spin torque oscillator (STO) device is located next to or near the write element in order to produce a high-frequency AC field
Implementation Method 2
The insertion layer increases the negative Hk
Implementation Method 3
The high-frequency AC field reduces an effective coercivity of a magnetic recording medium used to store data
Data Source
AI summary
Aspects of the present disclosure relate to spin torque oscillator (STO) and methods, such as spin torque oscillators used in write heads of magnetic media drives. The STO includes a seed layer, a spin polarization layer (SPL), a spacer layer, a field generation layer (FGL), a capping layer. An insertion layer is disposed within the STO. The insertion layer increases the negative Hk. The insertion layer may be located between the FGL and the capping layer, as well as between the FGL and the spacer layer. For a reverse STO, the insertion layer may be disposed between the FGL and the seed layer, as well as between the FGL and the spacer layer.