Spintronic Device Negative Interface Spin Scattering
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Solution Overview
Problem
Current magnetic recording technologies face challenges in achieving high recording densities while maintaining write head performance and reliability, as they require high voltage and current, which can degrade components and limit materials used, and hinder areal density capabilities.
Innovation Solution
A magnetic recording head design featuring a spintronic device with a negative polarization layer, interface layer, and field generating layer, where the negative polarization layer comprises Fe and one of Ti, V, Cr, or N, and the interface layer comprises V, Cr, or Ru, facilitating lower voltage or current usage by optimizing spin polarization for enhanced write field generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage and current are applied to produce write field enhancement, then the magnetic recording performance is improved, but the lifetime and reliability of the write head deteriorate due to component degradation
Solution Approach 1:
The patent changes the physical state and properties of the magnetic layers by optimizing the moment-thickness product and using energy-assisted recording (HAMR/MAMR) to alter the effective coercivity of the recording medium. This allows achieving the same write field enhancement with lower applied voltage and current, thus improving reliability while maintaining recording performance
Solution Approach 2:
The patent employs composite magnetic layer structures with specific moment-thickness products and combines multiple functional layers (write element, energy-assist magnetic layer, spin torque oscillator) to create a system that generates enhanced write fields more efficiently, reducing the need for high voltage/current operation
2Reliability
If the moment-thickness product of the energy-assist magnetic layer is lowered to reduce voltage or current, then the reliability is improved, but the writer performance and areal density capability deteriorate
Solution Approach 1:
The patent optimizes the moment-thickness product parameter to find the optimal balance point where sufficient write field enhancement is achieved with lower voltage/current operation. The energy-assisted recording technology changes the effective coercivity parameter of the recording medium, allowing lower writing fields to achieve the same recording density
Solution Approach 2:
The patent introduces an intermediary energy-assist magnetic layer and spin torque oscillator that mediate between the write element and the recording medium. These intermediaries amplify the write field effect, allowing the system to achieve high areal density capability with reduced direct write field requirements, thus enabling lower voltage/current operation without sacrificing productivity
3Productivity
If the width and pitch of write tracks are narrowed to achieve higher recording density, then the areal density is improved, but the surface area of the main pole must be decreased which limits the writing field effectiveness
Solution Approach 1:
The patent changes the effective coercivity parameter of the recording medium using energy-assisted recording, which allows narrower write tracks to be effectively written. The enhanced write field from the energy-assist magnetic layer compensates for the reduced main pole surface area, maintaining writing effectiveness at higher recording densities
Solution Approach 2:
The patent adds a temporal dimension to the writing process by using high-frequency AC fields from the spin torque oscillator. This time-varying field component provides additional writing capability that compensates for the reduced spatial dimension (smaller main pole area), enabling effective writing at higher areal densities
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 magnetic recording performance and reliability, increases areal density, and allows for the use of various materials, while reducing the critical current density for spin-transfer torque, thus improving write head efficiency and longevity.
Implementation Method 1
In MAMR, a 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 NPL and a first interface disposed between the NPL and the interface layer have a negative spin polarization while the FGL and a second interface disposed between the FGL and the spacer layer have a positive spin polarization
Data Source
AI summary
Aspects of the present disclosure generally relate to a magnetic recording head of a magnetic media drive. In one example, a magnetic recording head includes a main pole, a trailing shield, and spintronic device disposed between the main pole and the trailing shield. The spintronic device comprises a negative polarization layer (NPL) disposed on the main pole, the NPL comprising FeTi, FeV, FeCr, or FeN, an interface layer disposed on the NPL, the interface layer comprising V, Cr, or Ru, a spacer layer disposed on the interface layer, and a spin torque layer (FGL) disposed on the spacer layer. When current is applied to the spintronic device, the NPL and a first interface disposed between the NPL and the interface layer have a negative spin polarization while the FGL and a second interface disposed between the FGL and the spacer layer have a positive spin polarization.