Magnetic Field Generator for Independent Vertical and Horizontal Component Adjustment
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Solution Overview
Problem
Existing magnetic field generators in a half-space do not allow for independent adjustment of vertical and horizontal magnetic field components, posing implementation challenges for testing magnetic memory cells on wafers with limited available space.
Innovation Solution
A magnetic field generator with a magnetic circuit comprising a vertical axis and symmetrically arranged polar ends, where each magnetic circuit portion connecting polar ends runs inside coils capable of conducting currents of settable intensities and directions, allowing for independent adjustment of magnetic field components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a magnetic field generator is designed to operate entirely above the wafer surface, then the available space for positioning test probes and generating magnetic field is limited, but this constraint is necessary to accommodate the positioning device below the wafer
Solution Approach 1:
The magnetic field generator transitions from a conventional configuration requiring space on both sides of the wafer to a configuration that operates entirely above the wafer surface. The magnetic circuit is arranged with polar ends extending above the wafer, and coils positioned above the wafer surface, effectively moving the magnetic field generation system to a different spatial dimension (above the wafer) to resolve the space constraint conflict.
2Device complexity
If known magnetic field generators in a half-space are used, then the device structure is simpler, but they do not allow independent adjustment of vertical and horizontal magnetic field components
Solution Approach 1:
The magnetic field generator is segmented into multiple independent coils (first coil, second coil, third coil, fourth coil) arranged around the magnetic circuit. Each coil can be independently controlled to generate magnetic field components in different directions. This segmentation allows independent adjustment of vertical and horizontal magnetic field components by controlling the current in each coil separately, resolving the contradiction between device simplicity and field adjustment versatility.
Solution Approach 2:
The magnetic field generator is designed with multi-functionality to produce magnetic fields with adjustable direction and intensity entirely above the wafer surface. The system can generate both vertical and horizontal magnetic field components through the coordinated operation of multiple coils, making it universally applicable for testing magnetic memory cells with different orientations and configurations, thus achieving adaptability without significantly increasing structural complexity.
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
Enables the generation of a magnetic field with adjustable direction and intensity entirely above the wafer surface, facilitating the testing of magnetic memory cells and other components on wafers with limited access, improving the accuracy and effectiveness of characterization and testing processes.
Implementation Method 1
coils capable of being connected to circuits capable of conducting currents of settable intensities and of selected directions therethrough
Data Source
AI summary
The invention relates to a directional magnetic field generator with a magnetic circuit comprising: a first vertical-axis pole end (37) arranged above a horizontal plane; and at least two second pole ends (28A to 28D) symmetrically arranged on said horizontal plane, the generator further comprising coils arranged such that each magnetic circuit portion connecting two pole ends passes inside at least one coil, these coils being suitable for being connected to circuits for circulating currents of adjustable intensity in selected directions therein.