3D Magnetic Shielding Layout for Perpendicular Magnetization
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Solution Overview
Problem
Magnetic devices, particularly those with perpendicular magnetization, are vulnerable to external or stray magnetic fields that can alter their operation, leading to incorrect data storage and retrieval, and existing shielding methods for in-plane magnetization are inadequate for protecting devices with out-of-plane or perpendicular magnetization.
Innovation Solution
Implementing magnetic shielding configurations that extend along both the z-axis and x-axis to protect magnetic devices with perpendicular magnetization, shunting both in-plane and out-of-plane magnetic fields, thereby maintaining correct operation and enabling higher memory density, lower power consumption, and lower cost per bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic shielding plates are placed on top and bottom of a single chip package to protect from external magnetic fields, then in-plane magnetization is protected, but perpendicular magnetization along the z-axis remains vulnerable
Solution Approach 1:
The patent extends magnetic shielding from the traditional in-plane (x-y plane) configuration to include the out-of-plane z-dimension by positioning shielding plates at the top and bottom surfaces of the package. This three-dimensional shielding arrangement creates magnetic field shunting paths in all relevant directions, protecting perpendicular magnetization that was previously vulnerable to out-of-plane magnetic field interference.
2Reliability
If magnetic shielding is added to protect perpendicular magnetization, then device reliability improves, but device complexity increases
Solution Approach 1:
The magnetic shielding plates are designed to serve multiple functions simultaneously: they shield in-plane magnetization from x-direction fields, shield perpendicular magnetization from z-direction fields, and provide structural support for the package. This multi-functionality reduces the need for additional specialized shielding components, thereby limiting the increase in device complexity while achieving comprehensive magnetic field protection.
3Volume of moving object
If memory components are made smaller to reduce device size, then form factor improves, but susceptibility to magnetic field interference increases
Solution Approach 1:
The magnetic shielding plates are integrated into the package structure itself, with shields positioned at the top and bottom surfaces that nest around the magnetic memory components. This nested configuration provides comprehensive magnetic field protection while maintaining a compact overall form factor, as the shielding is incorporated within the existing package boundaries rather than adding external bulk.
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 proposed magnetic shielding effectively protects magnetic devices from external fields, ensuring reliable operation, higher memory density, lower power consumption, and reduced costs by minimizing interference from both in-plane and out-of-plane magnetization.
Implementation Method 1
The first magnetic shielding comprises a first magnetic material, the first magnetic shielding extending at least partially between a first surface of the magnetic device and a second surface of the magnetic device in the z-axis
Implementation Method 2
The second magnetic shielding comprises a second magnetic material, the second magnetic shielding extending at least partially between a third surface of the magnetic device and a fourth surface of the magnetic device in an x-axis
Data Source
AI summary
An example device includes a magnetic device, a first magnetic shielding, and a second magnetic shielding. The magnetic device is configured to determine a perpendicular magnetization that extends along a z-axis. The first magnetic shielding comprises a first magnetic material, the first magnetic shielding extending at least partially between a first surface of the magnetic device and a second surface of the magnetic device in the z-axis. The first surface is on an opposite side of the magnetic device from the second surface of the magnetic device. The second magnetic shielding comprises a second magnetic material, the second magnetic shielding extending at least partially between a third surface of the magnetic device and a fourth surface of the magnetic device in an x-axis. The fourth surface is on an opposite side of the magnetic device from the third surface of the magnetic device.