Programmable Magnetic Tunnel Junction Temperature Sensor
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Solution Overview
Problem
Conventional on-chip temperature sensors are not sensitive enough to temperature changes and require complex manufacturing processes, occupying valuable space on semiconductor chips.
Innovation Solution
A programmable magnetic tunnel junction structure in a Wheatstone bridge configuration, utilizing MRAM-like materials, is connected in series with a resistor material to enhance temperature sensitivity, featuring a stack of MRAM-like MTJ materials with a free layer and reference layer separated by a barrier layer, allowing magnetization rotation in response to signals or magnetic fields, and fabricated using integrated circuit technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional on-chip temperature sensors (resistors, MIM structures, MOSFETs) are used, then the manufacturing process is complex and they occupy valuable chip area, but they provide insufficient temperature sensitivity
Solution Approach 1:
The patent changes the fundamental operating principle from conventional resistor-based temperature sensing to magnetic tunnel junction-based sensing. The MTJ structure utilizes spin-dependent tunneling current that is highly sensitive to temperature-induced changes in magnetic anisotropy and resistance, achieving 2-4 times greater temperature sensitivity while using standard CMOS-compatible fabrication processes
Solution Approach 2:
The patent employs a composite structure combining magnetic tunnel junction materials (ferromagnetic layers, tunnel barrier, antiferromagnetic layers) with CMOS circuitry. This composite approach integrates the high temperature sensitivity of MTJ materials with the manufacturing capabilities of CMOS platforms, resolving the contradiction between sensitivity and manufacturing complexity
2Measurement precision
If conventional on-chip temperature sensors are used, then the manufacturing process is simple, but they occupy valuable real estate on the chip
Solution Approach 1:
The patent transitions from planar resistor-based temperature sensors to vertically stacked magnetic tunnel junction structures. The MTJ stack extends in the vertical dimension with multiple thin films (ferromagnetic layers, oxide barriers, antiferromagnetic layers), achieving high temperature sensitivity in a compact footprint that occupies minimal chip real estate
3Measurement precision
If MTJ structures are used, then temperature sensitivity is enhanced 2-4 times, but the device complexity increases
Solution Approach 1:
The patent designs the magnetic tunnel junction structure to serve multiple functions: temperature sensing, magnetic field sensing, and non-volatile memory storage. This multi-functionality justifies the increased fabrication complexity by providing additional capabilities beyond simple temperature measurement, making the enhanced device worthwhile
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 solution provides higher sensitivity to temperature changes with a smaller footprint compared to CMOS resistor-based designs, achieving thermal sensitivity approximately 2-4 times greater than conventional CMOS resistor-based temperature sensors.
Implementation Method 1
a programmable magnetic tunnel junction structure, utilizing MRAM-like materials, is connected in series with a resistor material to enhance temperature sensitivity
Implementation Method 2
a stack of MRAM-like MTJ materials with a free layer and reference layer separated by a barrier layer
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to temperature sensors with programmable magnetic tunnel junction structures and methods of manufacture. A structure includes a resistor material connected in series with a programmable magnetic tunnel junction structure in a Wheatstone bridge configuration.