Magnetic Domain Wall Element With Mixing Layer Pinned-Region Control
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Solution Overview
Problem
Magnetic domain walls in recording layers often disappear when they intrude into magnetization pinned regions, preventing data recording.
Innovation Solution
A magnetic domain wall moving element with a mixing layer at the interface of conductive layers, where a dissimilar metal is mixed with ferromagnetic materials, creating a non-uniform energy potential to control domain wall movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetization pinned regions are formed at both ends of the magnetic recording layer, then domain wall movement is constrained within the recording region, but domain walls may intrude into pinned regions and disappear, preventing data recording
Solution Approach 1:
The patent applies local quality by creating a mixing layer with non-uniform composition at the interface between the conductive layer and magnetic recording layer. The mixing layer contains ferromagnetic material and dissimilar metal atoms distributed non-uniformly, generating localized variations in magnetic properties and energy potential. This local non-uniformity creates energy barriers that prevent domain walls from intruding into pinned regions, thereby improving data recording reliability while maintaining ease of domain wall movement control within the recording region.
Solution Approach 2:
The patent utilizes parameter changes by introducing a mixing layer that alters the magnetic energy landscape. The mixing layer changes the local magnetic anisotropy, exchange coupling, and energy potential parameters at the interface region. These parameter changes create energy barriers that confine domain walls within the magnetic recording layer, preventing them from disappearing into pinned regions and thus improving data recording reliability.
2Ease of operation
If a mixing layer with dissimilar metal is introduced at the interface, then domain wall movement is easily controlled, but the device structure becomes more complex
Solution Approach 1:
The patent applies merging by combining the conductive layer and magnetic recording layer into a single integrated structure with a mixing layer at the interface. The mixing layer is formed by the interdiffusion of ferromagnetic material and dissimilar metal atoms during fabrication, merging two separate layers into a composite structure with controlled non-uniform composition. This merging approach enables easy domain wall movement control through the energy barriers created by the mixing layer, while avoiding the need for additional separate components or complex multi-layer structures.
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 solution effectively prevents domain walls from intruding into pinned regions, allowing easy control and reliable data recording and reading.
Implementation Method 1
a magnetic recording layer which extends in a first direction and includes a ferromagnetic material
Implementation Method 2
the first layer includes a mixing layer at an interface with the magnetic recording layer, a ferromagnetic material and a dissimilar metal are mixed in the mixing layer
Data Source
AI summary
A magnetic domain wall moving element includes a magnetic recording layer which extends in a first direction and includes a ferromagnetic material, and a first conductive layer and a second conductive layer which are separately connected to the magnetic recording layer, the first conductive layer includes a ferromagnetic first layer in contact with the magnetic recording layer, the first layer includes a mixing layer at an interface with the magnetic recording layer, a ferromagnetic material and a dissimilar metal are mixed in the mixing layer, and the dissimilar metal is a metal different from each of the ferromagnetic material that mainly constitutes the first layer and the ferromagnetic material that mainly constitutes the magnetic recording layer.