Magnetic Memory Domain Wall Control via Columnar Segmentation

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Solution Overview

Problem

Current magnetic memory technologies face challenges in writing and reproducing magnetic domains with high precision, particularly in magnetic units with a columnar configuration, which limits their ability to achieve high-density recording and stable domain wall movement.

Innovation Solution

The magnetic memory design includes a magnetic unit with a columnar configuration and a perpendicular magnetization layer, connected to a recording/reproducing element and electrodes, allowing for the movement of domain walls by current flow, enabling precise writing and reproduction of magnetic domains through the use of a multilayered film structure and anodic oxidation for hole formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a magnetic wire with domain walls is used for magnetic memory, then magnetic domain recording is achieved, but writing and reproducing magnetic domains with high precision is difficult

Engineering Contradiction:

Improvewriting and reproducing precisionVSAvoiddomain wall movement stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The magnetic wire is divided into multiple magnetic units, each capable of independently storing magnetic domain information. This segmentation allows precise control and manipulation of individual magnetic domains, improving writing and reproducing precision while maintaining stable domain wall movement in each unit.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A magnetic layer is introduced as an intermediary component between the magnetic wire and the recording/reproducing element. This magnetic layer facilitates precise magnetic domain writing and reproduction by mediating the interaction, thereby improving precision without compromising domain wall stability in the magnetic wire.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If conventional magnetic memory structures are used, then magnetic domain storage is achieved, but recording density is limited

Engineering Contradiction:

Improverecording densityVSAvoiddomain control precision

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The magnetic units are arranged in a three-dimensional configuration with magnetic layers extending in directions intersecting the magnetic wire axis. This dimensional expansion increases the number of magnetic domains that can be stored per unit volume, thereby increasing recording density while maintaining precise domain control through the structured arrangement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Multiple magnetic layers are nested around the magnetic wire in a concentric arrangement, with each layer providing additional storage capacity. This nested structure maximizes the use of available space, increasing recording density while maintaining precise control over each magnetic domain through the organized hierarchical structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Stability of the object's composition

If magnetic units with columnar configuration are used, then structural stability is achieved, but domain wall movement control is insufficient

Engineering Contradiction:

Improvemagnetic unit stabilityVSAvoiddomain wall control

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The magnetic layer is designed to be movable relative to the magnetic wire, allowing dynamic adjustment of magnetic domain positions. This dynamic structure enables precise control of domain wall movement while maintaining the overall structural stability of the columnar magnetic units through their fixed geometric arrangement.

Inventive Principle:

Principle #15Dynamics

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 approach enables efficient and precise recording and reproduction of magnetic domains, enhancing recording density and stability, and facilitating the development of high-capacity shift register memories with improved domain wall control.

Implementation Method 1

a phenomenon has been reported in which the domain walls in a magnetic wire are moved by causing a current to flow in the wire

Methodology Applied

Scientific EffectDomain wall movement: Magnetic Field

Implementation Method 2

making a hole in a base member by performing anodic oxidation

Methodology Applied

Scientific EffectAnodic oxidation: Anodising

Data Source

PatentUS9293696B2Magnetic memory and shift register memory

Publication Date: 2016.03.22 KIOXIA CORP

AI summary

According to one embodiment, a magnetic memory includes a first magnetic unit, a first magnetic layer, a first recording/reproducing element, a first electrode, and a second electrode. The first magnetic unit extends in a first direction. The first magnetic unit includes a plurality of magnetic domains arranged in the first direction. The first magnetic unit has a columnar configuration having a hollow portion. The first magnetic layer is connected to a first end portion of the first magnetic unit, the first magnetic layer extends in a direction intersecting the first direction. The first recording/reproducing element is provided in contact with the first magnetic layer. The first electrode is electrically connected to the first magnetic layer. The second electrode is connected to a second end portion of the first magnetic unit on a side opposite to the first end portion.