Magnetic Memory Domain Wall Control via Pulse Engineering
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Solution Overview
Problem
Current magnetic memory devices face challenges in increasing storage density without complex switch circuits and minimizing erroneous shifting and writing operations.
Innovation Solution
A magnetic memory device design that includes a first memory portion with a magnetic layer and a nonmagnetic layer, connected via a conductive portion and interconnection, where specific pulse heights and lengths are applied during write, shift, and read operations to control magnetization and domain wall movement, thereby enhancing storage density and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex switch circuits are used to control memory operations, then operational reliability improves, but device complexity increases
Solution Approach 1:
The patent extracts and removes the complex switch circuit from the memory device structure. By using a magnetic memory device where domain walls naturally move along a track in response to current pulses without requiring electronic switches, the invention eliminates the switch circuit component entirely while maintaining reliable operational control through magnetic field and current pulse management.
2Productivity
If storage density is increased by reducing cell size, then productivity improves, but manufacturing precision requirements worsen
Solution Approach 1:
The patent transitions from planar two-dimensional memory cell arrangements to a three-dimensional structure by introducing a vertical track where domain walls move along the length of the track. This dimensional change allows multiple storage locations to be arranged along the track axis, increasing storage density without proportionally reducing the lateral footprint and manufacturing precision requirements.
Solution Approach 2:
The magnetic memory device is segmented into discrete storage locations along the track, with each location defined by the position of a domain wall. This segmentation allows independent addressing and control of multiple storage sites without requiring proportionally smaller feature sizes, as each segment can be accessed through controlled current pulses that move domain walls to specific positions.
3Reliability
If pulse height is increased to improve write operation reliability, then write reliability improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic pulsed current action to move domain walls along the track. By using a series of controlled current pulses rather than continuous high-power current, the system achieves reliable write operations through cumulative domain wall displacement while minimizing energy consumption. The pulsed nature allows the system to build up the necessary magnetic effect over time without sustaining high power levels.
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 allows for stable operation without complex switch circuits, increases storage density, and effectively suppresses erroneous shifting and writing, ensuring reliable data storage.
Implementation Method 1
The first magnetic portion includes a domain wall. A position of the domain wall is different before and after the applying of the second pulse.
Implementation Method 2
The controller is configured to apply a second pulse between the first conductive portion and the first interconnection in a first shift operation. The second pulse has a second pulse height and a second pulse length.
Implementation Method 3
The first memory portion includes a first magnetic portion including a first portion and a second portion, a first magnetic layer, and a first nonmagnetic layer provided between the second portion and the first magnetic layer.
Data Source
AI summary
According to one embodiment, a magnetic memory device includes a first memory portion, a first conductive portion, a first interconnection, and a controller. The first memory portion includes a first magnetic portion including a first portion and a second portion, a first magnetic layer, and a first nonmagnetic layer provided between the second portion and the first magnetic layer. The first conductive portion is electrically connected to the first portion. The first interconnection is electrically connected to the first magnetic layer. The controller is electrically connected to the first conductive portion and the first interconnection. The controller applies a first pulse having a first pulse height and a first pulse length between the first conductive portion and the first interconnection in a first write operation and applies a second pulse having a second pulse height and a second pulse length in a first shift operation.