Magnetic Memory Device Domain Wall Control via Potential Differences
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Solution Overview
Problem
Current magnetic memory devices face challenges in increasing storage density due to limitations in the movement and manipulation of domain walls within magnetic wires.
Innovation Solution
The magnetic memory device incorporates a magnetic portion with multiple layers and semiconductor regions, along with a controller that sets specific potential differences across interconnects to manage current flow and shift domain walls, enabling efficient write, read, and shift operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If domain walls are moved in magnetic wires to store information, then storage density can be increased, but the manipulation and movement of domain walls becomes limited and complex
Solution Approach 1:
The magnetic wire is divided into multiple magnetic portions (first magnetic portion, second magnetic portion, third magnetic portion) with different magnetization directions. This segmentation allows independent control of domain walls in different regions, simplifying the manipulation process while increasing storage density by creating multiple storage locations within a single wire structure.
Solution Approach 2:
Different magnetic portions are assigned different magnetization directions (first direction, second direction, third direction) to create local variations in magnetic properties. This enables domain walls to be stabilized at specific locations with predetermined magnetization orientations, making domain wall manipulation more predictable and less complex while allowing multiple bits of information to be stored in different regions.
2Reliability
If multiple interconnects are used to control domain wall movement, then operational stability is maintained, but device complexity and interconnect requirements increase
Solution Approach 1:
The first interconnect is designed to serve multiple functions: it can apply current in a first direction to move domain walls between the first and second magnetic portions, and also apply current in a second direction to move domain walls between the second and third magnetic portions. This multi-functionality reduces the total number of interconnects needed while maintaining stable domain wall control through a single versatile connection.
Solution Approach 2:
The system dynamically changes the direction of current flow through the first interconnect to achieve different domain wall movement operations. By reversing current direction, the same interconnect can move domain walls in opposite directions along the magnetic wire, providing operational flexibility and stability without requiring separate dedicated interconnects for each movement direction.
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 configuration allows for stable operations with reduced interconnects, enhancing storage density and maintaining operational stability while allowing for efficient data storage and retrieval.
Implementation Method 1
information recorded in a magnetic wire is moved by moving domain walls
Implementation Method 2
the controller sets the first interconnect to a first potential, sets the second interconnect to a second potential, and sets the third interconnect to a third potential
Data Source
AI summary
According to one embodiment, a magnetic memory device includes a magnetic portion, a first magnetic layer, a first nonmagnetic layer, a first element portion, first to third interconnects, and a controller. In a first operation, the controller sets the first interconnect to a first potential, the second interconnect to a second potential, and the third interconnect to a third potential. An absolute value of a difference between the second potential and the third potential is greater than that between the first potential and the third potential. In a second operation, the controller sets the first interconnect to a fourth potential, the second interconnect to a fifth potential, and the third interconnect to a sixth potential. An absolute value of a difference between the fifth potential and the sixth potential is less than that between the fourth potential and the sixth potential.