Magnetic Memory Tube Design for Low-Cost Domain Wall Storage
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Solution Overview
Problem
Magnetic domain wall memory technologies face high manufacturing costs due to complex micromachining processes required for forming nanowires and electrodes, which hinder the development of cost-effective high-density magnetic memory solutions.
Innovation Solution
A magnetic memory design featuring a magnetic tube with a circular ring-like cross-section, an intermediate layer, and a reference portion formed with ferromagnetic material, utilizing a spin torque transfer technique for information storage and read operations, which simplifies the manufacturing process and reduces costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micromachining is performed to form three-dimensional structures for nanowires, then high-density magnetic memory can be realized, but manufacturing costs increase
Solution Approach 1:
The patent extracts the complex micromachining process entirely by using self-organized magnetic domain patterns formed through magnetic field application. Instead of mechanically forming nanowires through multi-step micromachining, the invention uses magnetic field-induced domain wall patterns that naturally form the required structures, eliminating the need for costly and complex fabrication processes while maintaining high-density storage capability
Solution Approach 2:
The magnetic material automatically forms the desired domain wall patterns when exposed to a magnetic field, without requiring external micromachining intervention. The magnetic domains self-organize into the required configuration for high-density storage, making the system self-configuring and eliminating complex manufacturing steps
2Manufacturing precision
If multiple micromachining processes are used for nanowire and electrode fabrication, then high-density magnetic memory is achieved, but device complexity increases
Solution Approach 1:
The patent removes the entire micromachining fabrication sequence by using magnetic field-induced domain patterns. The magnetic domains naturally form precise patterns without requiring mechanical drilling, etching, or deposition processes, thereby eliminating the complex multi-step fabrication machinery and procedures while achieving the same positioning precision
Solution Approach 2:
The invention replaces the mechanical micromachining system with a magnetic field-based system. Instead of using physical tools to carve and shape nanowires and electrodes, magnetic fields are used to induce domain wall patterns that serve the same functional purpose, substituting mechanical fabrication with magnetic field control
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 proposed design lowers manufacturing costs while maintaining high-density recording capabilities, enabling efficient information storage and retrieval through simplified fabrication methods and improved magnetic domain manipulation.
Implementation Method 1
utilizing a spin torque transfer technique for information storage and read operations
Implementation Method 2
a reference portion formed on part of a surface of the nonmagnetic layer, which consists of a magnetic material on the surface of the nonmagnetic layer being on the opposite side from the magnetic structure
Data Source
AI summary
A magnetic memory according to an embodiment includes: a magnetic structure extending in a first direction and having a circular ring-like shape in cross-section in a plane perpendicular to the first direction; a nonmagnetic layer formed on an outer surface of the magnetic structure, the outer surface extending in the first direction; and at least one reference portion formed on part of a surface of the nonmagnetic layer, the surface being on the opposite side from the magnetic structure, the at least one reference portion containing a magnetic material.