Magnetometer Spin Arrangement at Magic Angle
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Solution Overview
Problem
Magnetometer sensitivity is compromised due to increased magnetic interference from spin-spin interactions and interactions with the solid state lattice as spin density increases, limiting the resolution and sensitivity of magnetic field detection.
Innovation Solution
Arranging electronic spins in a line at a specific angle, known as the 'magic angle' (approximately 54.7°), minimizes intrinsic interactions between spins, allowing for higher spin densities and improved coherence times, enabling more sensitive and high-resolution magnetic field detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spin density is increased to improve magnetic field detection sensitivity and resolution, then the number of detectable spins increases, but magnetic interference from spin-spin interactions increases and coherence time decreases
Solution Approach 1:
The patent applies parameter changes by modifying the geometric arrangement of spins - specifically arranging them in lines at the magic angle (54.7 degrees) relative to the magnetic field direction. This angular parameter change minimizes dipolar coupling between spins while maintaining high spin density, thereby preserving coherence time despite increased spin concentration.
Solution Approach 2:
The patent creates a composite spin system where spins are organized into linear arrays at specific orientations within the solid carrier. This composite structure combines multiple spins in a controlled geometric configuration that reduces mutual interference while maintaining high detection sensitivity through collective signal enhancement.
2Measurement precision
If spin density is increased to improve magnetic field detection sensitivity, then more spins are available for detection, but magnetic interference from spin-spin interactions increases
Solution Approach 1:
The patent changes the spatial parameter of spin arrangement by positioning spins at the magic angle (54.7 degrees) relative to the magnetic field. This specific angular parameter minimizes the dipolar interaction term in the Hamiltonian, effectively reducing magnetic interference while maintaining high spin density for sensitive detection.
Solution Approach 2:
The patent applies local quality by creating distinct linear arrays of spins with specific orientations within the solid carrier. Each spin line is locally optimized at the magic angle to minimize interactions, while the overall system maintains high density through multiple such arrays.
3Quantity of substance
If spins are arranged in a three-dimensional array in a diamond crystal lattice, then spin density can be maintained, but the structure cannot be easily miniaturized and integrated onto electronic chips
Solution Approach 1:
The patent transitions from a three-dimensional diamond crystal lattice to a two-dimensional planar arrangement of spin lines on a solid carrier surface. This dimensional reduction enables compatibility with planar electronic chip fabrication techniques while maintaining high effective spin density through optimized linear arrangements at the magic angle.
Solution Approach 2:
The patent segments the spin system into discrete linear arrays arranged in specific orientations on the solid carrier. This segmentation allows independent fabrication and integration of spin lines onto electronic chips, facilitating miniaturization and device integration while maintaining high spin density through controlled spacing and orientation.
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 allows for highly sensitive and high-resolution magnetic field detection with increased spin densities, potentially achieving resolutions of 0.1 nm and sensitivities of 1 attoTesla, while reducing magnetic interference and maintaining long spin coherence times.
Implementation Method 1
The magnetometer detects an external magnetic field by utilising the effect that the plurality of electronic spins align with the external magnetic field in response to laser optical excitation radiation applied to the electronic spins
Implementation Method 2
The RF field induces the spins to precess about the magnetic field, the frequency of the spin precession being linearly related to the magnetic field by the Zeeman shift of the electronic spin energy levels
Implementation Method 3
the frequency of the spin precession being linearly related to the magnetic field by the Zeeman shift of the electronic spin energy levels
Data Source
AI summary
The disclosure concerns a magnetometer for detecting a magnetic field, comprising: a solid state electronic spin system containing a plurality of electronic spins and a solid carrier, wherein the electronic spins are configured to be capable of aligning with an external magnetic field in response to an alignment stimulus; and a detector configured to detect an alignment response of the electronic spins, such that the external magnetic field can be detected; wherein the electronic spins are provided as one or more groups, each group containing a plurality of spins, the plurality of spins in each of the one or more groups being arranged in a line that is angled at an angle Θ with respect to the local direction of the external magnetic field at the said group. Also disclosed is a method for detecting a magnetic field.