Magnetoresistive Magnetic Memory Layout for Read Error Isolation
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Solution Overview
Problem
Magnetic memories face challenges in efficiently receiving magnetic fields from magnetic members due to interference from neighboring magnetic fields, which can lead to read errors.
Innovation Solution
The design includes cylindrical magnetic members with specific end portions and magnetoresistive elements that overlap these end portions, where the magnetization directions of the magnetization variable and fixed layers intersect at angles other than 0 or 180 degrees, and a magnetic circuit configuration that enhances the magnetic field reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic field from the magnetic member is increased to improve detection sensitivity, then the magnetoresistive element can detect the magnetic field more effectively, but read errors occur due to interference from magnetic fields of neighboring magnetic members
Solution Approach 1:
A magnetic insulating layer is introduced between the magnetic member and the magnetoresistive element. This intermediary layer blocks the leakage magnetic field from neighboring magnetic members while allowing the magnetic field from the target magnetic member to reach the magnetoresistive element, thereby preventing read errors caused by magnetic interference
Solution Approach 2:
The harmful leakage magnetic field is extracted and isolated by the magnetic insulating layer, separating the useful magnetic field signal from the interfering magnetic field components. This allows the magnetoresistive element to receive only the intended magnetic field without contamination from adjacent magnetic members
2Measurement precision
If the magnetic field strength is increased to reduce the detection window size, then detection sensitivity improves, but the influence of neighboring magnetic fields increases causing read errors
Solution Approach 1:
The magnetic insulating layer acts as a selective mediator that permits the magnetic field from the intended magnetic member to pass through to the magnetoresistive element while blocking the magnetic fields from neighboring magnetic members, thus reducing magnetic field interference without compromising detection sensitivity
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 efficient detection of magnetic fields with high sensitivity and a wide detection window, reducing read errors and enabling reliable data storage and retrieval.
Implementation Method 1
a magnetoresistive element provided at an end portion of the magnetic member detects a magnetization direction of the magnetic member to change a resistance state, and detects a resistance value of the magnetoresistive element
Data Source
AI summary
A magnetic memory includes a plurality of cylindrical magnetic members each extending along a first direction and having a first end portion and a second end portion; and a magnetoresistive element that includes: a magnetization variable layer with a variable magnetization direction, a magnetization fixed layer with a fixed magnetization direction, and a non-magnetic layer between the magnetization variable layer and the magnetization fixed layer. When viewed in the first direction, the magnetoresistive element overlaps a part of the first end portion of one of the magnetic members. The magnetization direction of the magnetization variable layer intersects with the magnetization direction of the magnetization fixed layer at an angle larger than 0 degrees and smaller than 180 degrees.