Magnetic Memory Yoke Structure for Domain Wall Control
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Solution Overview
Problem
Magnetic memories with existing structures face decreased write efficiency due to domain walls being fixed to the magnetic member ends during shift operations, leading to inefficient data storage and retrieval.
Innovation Solution
The magnetic memory design incorporates a yoke structure with a specific configuration, where a conductive, soft magnetic material surrounds part of the field lines, allowing write currents to induce magnetic fields that write data to the upper portions of magnetic members without leading electrodes, preventing domain walls from being fixed to the ends and enhancing the writing magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If domain walls are moved by applying shift current through magnetic members with leading portions, then data can be stored in the magnetic members, but the domain walls become fixed to the ends of the magnetic members causing decreased write efficiency
Solution Approach 1:
The magnetic member is divided into a body portion and a leading portion. The body portion stores data while the leading portion serves as a dedicated domain wall anchoring region. This segmentation allows domain walls to be fixed in the leading portion without affecting data storage in the body portion, thereby maintaining write efficiency while ensuring data reliability.
Solution Approach 2:
The leading portion acts as an intermediary between the shift current application and the data storage region. It provides a transition zone where domain walls can be manipulated without directly interfering with the magnetic domains that store data, thus preventing domain wall fixation issues while maintaining reliable data storage.
2Ease of operation
If leading portions are connected to magnetic members to enable domain wall movement, then data writing is enabled, but the structure complexity increases and write efficiency decreases
Solution Approach 1:
The leading portion is merged with the magnetic member body to form a single integrated structure. This eliminates the need for separate leading electrode components while maintaining the functional benefits of having a dedicated domain wall control region, thus reducing device complexity while preserving data writing capability.
Solution Approach 2:
The leading portion serves multiple functions: it acts as a domain wall anchoring region, provides a control zone for shift current application, and maintains magnetic coupling with the data storage body. This multi-functionality reduces the need for additional components, simplifying the overall device structure while enabling effective data writing operations.
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 prevents data from being fixed to the magnetic member ends, thereby improving write efficiency and allowing for effective data storage and retrieval without reducing the magnetic field strength.
Implementation Method 1
a yoke structure with a specific configuration, where a conductive, soft magnetic material surrounds part of the field lines, allowing write currents to induce magnetic fields that write data to the upper portions of magnetic members
Implementation Method 2
allowing write currents to induce magnetic fields that write data to the upper portions of magnetic members
Data Source
AI summary
A magnetic memory of an embodiment includes: a first magnetic member including a first and second portions and extending in a first direction; a first and second wirings disposed to be apart from the first magnetic member and extending in a second direction intersecting the first direction, the first and the second wirings being separated from each other in a third direction intersecting the first and second directions, the first magnetic member being disposed to be apart from a region between the first wiring and the second wiring in the first direction; and a second magnetic member surrounding at least parts of the first and second wirings, the second magnetic member including a third portion located to be more distant from the first magnetic member, a fourth portion located to be closer to the first magnetic member, and a fifth portion located in the region.