Spin Torque Oscillator With Antiferromagnetic Control Layer
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Solution Overview
Problem
Spin torque oscillators face challenges in generating a strong high-frequency magnetic field while maintaining stability and reliability, due to limitations in saturated magnetic flux density and film thickness, which affect spin torque efficiency and magnetic field orientation.
Innovation Solution
A spin torque oscillator design with a magnetization control layer antiferromagnetically coupled via a nonmagnetic coupling layer to a high-frequency magnetic field generation layer, optimizing the layer structure and materials to enhance in-plane magnetization and reduce damping, thereby increasing high-frequency magnetic field intensity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the saturated magnetic flux density and film thickness are increased to obtain a high high-frequency magnetic field intensity, then the high-frequency magnetic field intensity is improved, but the current density necessary for oscillation increases causing heating and electromigration problems
Solution Approach 1:
The patent changes the magnetization orientation parameter from in-plane to perpendicular orientation in the high-frequency magnetic field generation layer. This parameter change allows the system to achieve high high-frequency magnetic field intensity without increasing current density, as the perpendicular magnetization configuration enables more efficient spin torque oscillation with reduced damping, thereby avoiding heating and electromigration problems while maintaining high field intensity
Solution Approach 2:
The patent employs a composite structure combining a perpendicular magnetization ferromagnetic layer with a magnetization control layer that has in-plane magnetization. This composite material arrangement allows the system to leverage the high-frequency oscillation capability of perpendicular magnetization while using the in-plane magnetized control layer to stabilize the oscillation and reduce damping, achieving both high field intensity and reliability without excessive current density
2Illumination intensity
If the magnetization of the high-frequency magnetic field generation layer is oriented perpendicularly to the film plane, then the high-frequency magnetic field intensity is improved, but the magnetic field orientation stability decreases due to sensitivity to inclined magnetic fields
Solution Approach 1:
The patent introduces a magnetization control layer as an intermediary between the perpendicular magnetization ferromagnetic layer and the external environment. This control layer with in-plane magnetization acts as a mediator that stabilizes the perpendicular magnetization configuration against disturbances from inclined magnetic fields, thereby maintaining both high field intensity and orientation stability
Solution Approach 2:
The patent changes the magnetization orientation parameter of the control layer to in-plane orientation, which provides stability to the perpendicular magnetization configuration. This parameter change in the control layer creates a protective effect that maintains the perpendicular magnetization stability despite the presence of inclined magnetic fields, resolving the contradiction between field intensity and stability
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 achieves increased high-frequency magnetic field intensity and stable oscillation, improving reliability and efficiency by balancing spin injection efficiency and magnetic field orientation, allowing for robust operation against magnetic field inclinations.
Implementation Method 1
the spin torque oscillator that generates microwaves by causing a ferromagnetic material to oscillate by using spin torque
Implementation Method 2
spin torque oscillation, making the possibility of microwave assisted recording more realistic
Implementation Method 3
A magnetization control layer is antiferromagnetically coupled via a nonmagnetic coupling layer with an interface contacting a high-frequency magnetic field generation layer
Implementation Method 4
magnetization control layer antiferromagnetically coupled via a nonmagnetic coupling layer
Implementation Method 5
the magnetic resonance of the high-frequency magnetic field and the magnetic field from the magnetic head. Because the technique (hereafter referred to as 'microwave assisted recording') utilizes magnetic resonance
Implementation Method 6
the magnetic recording medium is heated by Joule heating or magnetic resonance by using a high-frequency magnetic field
Data Source
AI summary
A spin torque oscillator generates a strong high-frequency magnetic field stably and has high reliability. A magnetic recording head includes a main magnetic pole and a spin torque oscillator. A magnetization control layer is antiferromagnetically coupled via a non-magnetic coupling layer with an interface contacting a high-frequency magnetic field generation layer of the spin torque oscillator.