Magnetic Capping Layer Switching With Ultrafast Pulse Assistance
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Solution Overview
Problem
Existing magnetic recording technologies fail to effectively address the challenges of ultrafast pulse assisted magnetic recording, particularly in the field of magnetic recording systems, specifically in the field of magnetic recording systems, where the magnetic capping layer has faster magnetization dynamics than the hard magnetic recording layer, making it difficult to flip the magnetic state of the hard magnetic recording layer without significant heating or thermal gradients.
Innovation Solution
The use of ultrafast energy pulses, such as laser pulses, in conjunction with a magnetic write field to flip the magnetic state of a magnetically softer capping layer, which then serves as a nucleation site for the hard magnetic recording layer, allowing for magnetic switching without substantial heating or thermal gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic write field is applied to flip the magnetic state of the hard magnetic recording layer, then magnetic recording is achieved, but the magnetic write field alone is insufficient to flip the magnetic state without additional assistance
Solution Approach 1:
The patent introduces a magnetic capping layer as an intermediary between the write head and the hard magnetic recording layer. This capping layer with faster magnetization dynamics serves as a mediator that can be flipped by the write field, which then nucleates the switching of the underlying hard magnetic layer, enabling reliable recording without requiring excessively strong write fields.
Solution Approach 2:
The magnetic capping layer undergoes preliminary magnetization switching before the hard magnetic recording layer. By first flipping the capping layer's magnetic state, the system creates favorable nucleation conditions that facilitate subsequent switching of the harder recording layer, effectively preparing the system in advance for the main switching event.
2Productivity
If conventional laser pulses are used to assist magnetic recording, then magnetic switching is facilitated, but significant heating and thermal gradients are induced
Solution Approach 1:
The patent fundamentally changes the temporal parameter of the laser pulse, using ultrafast pulses with durations of 10 picoseconds or less. This extreme shortening of the pulse duration allows the laser energy to be deposited and utilized for magnetic switching before significant thermal diffusion can occur, thereby achieving efficient switching without substantial heating or thermal gradients.
3Speed
If the magnetic capping layer has faster magnetization dynamics than the hard magnetic recording layer, then the capping layer can be flipped without flipping the recording layer, but this creates a complexity in layer composition and properties
Solution Approach 1:
The patent applies local quality by giving the magnetic capping layer specific localized properties (higher magnetization of 1.5 to 2.4 Tesla and higher damping constant of 0.2 to 0.9) that differ from the underlying hard magnetic recording layer. This localized differentiation in material properties enables the capping layer to exhibit faster magnetization dynamics while maintaining overall system functionality.
Solution Approach 2:
The patent employs a composite layered structure consisting of a magnetic capping layer (made from materials like CoFe, NiFe, or CoPt with specific doping) over a hard magnetic recording layer (FePt or CoPt). This composite material approach allows each layer to have optimized properties for its specific function, with the capping layer providing fast dynamics and the recording layer providing stable data storage.
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 approach enables efficient magnetic recording by utilizing the faster magnetization dynamics of the capping layer to facilitate switching in the underlying hard magnetic recording layer, thereby enhancing areal density capability without inducing thermal gradients, thus improving data storage density and stability.
Implementation Method 1
The use of ultrafast energy pulses, such as laser pulses, in conjunction with a magnetic write field to flip the magnetic state of a magnetically softer capping layer
Implementation Method 2
applying a magnetic write field concurrently with applying an ultrafast energy pulse to a region of a magnetic recording media
Data Source
AI summary
Described are systems, methods, and media for magnetic recording assisted by the use of ultrafast pulses such as ultrafast laser pulses. A layered magnetic medium includes a thin, magnetically softer capping layer disposed over a magnetically harder data recording layer. The capping layer is configured to have fast magnetization dynamics, and to have faster magnetization dynamics than the data recording layer. Due to the fast magnetization dynamics of the capping layer, ultrafast pulses can be used to assist a magnetic write field in magnetizing the capping layer without inducing any significant heating in the bulk of the media. The magnetization of the capping layer nucleates magnetization in the data recording layer under the influence of the magnetic write field.