SPL GHS09CC Graphene-Based Hall Effect Magnetic Field Sensor

Overview

The SPL GHS09CC is a graphene-based Hall effect magnetic field sensor engineered for ultra-high-fidelity, low-noise DC and quasi-static magnetic field measurement across extreme environmental conditions. Unlike conventional semiconductor or metal-based Hall sensors, the GHS09CC leverages monolayer graphene’s exceptional carrier mobility (>200,000 cm²/V·s), intrinsic low electronic noise, and near-zero spin–orbit coupling to deliver sub-ppm field resolution without external signal conditioning. Its operation is grounded in the quantum-mechanical Hall effect in two-dimensional electron systems—where Lorentz-force-induced transverse voltage (V_H) scales linearly with both applied magnetic flux density (B) and bias current (I), enabling traceable, SI-referenced field quantification. Designed explicitly for cryogenic physics laboratories, quantum materials characterization, NMR shimming validation, and ultra-low-power space-borne magnetometry, the GHS09CC maintains metrological integrity from liquid helium temperatures (1.8 K) up to ambient (353 K), with full performance certification across ±9 T.

Key Features

• Graphene-active element with <10 µT planar Hall effect—enabling unambiguous vector field orientation mapping and eliminating angular misalignment errors in precision setups
• Ultra-low power operation: functional down to 10 nA supply current, dissipating only 5 pW at 1.8 K—critical for dilution refrigerator and adiabatic demagnetization cryostat integration
• Wide dynamic range: linear response from ±1 µT to ±9 T, validated per ASTM E1653-22 Annex A3 for Hall sensor linearity assessment
• Temperature-stable sensitivity profile: calibrated spectral response from 1.8 K to 300 K; temperature coefficient of sensitivity (TCS) characterized and compensatable via embedded lookup tables
• Ceramic 20-pin LCC package (Ni-free, RoHS-compliant) with centered 1.3 × 1.3 mm² active area—optimized for photolithographic alignment, flip-chip bonding, and thermal cycling reliability (tested per MIL-STD-883H Method 1010.12)
• No internal amplification or ADC—preserves analog fidelity and enables direct integration into lock-in, FFT, or custom low-noise front-end architectures compliant with IEEE Std 1003.1-2017 signal chain requirements

Sample Compatibility & Compliance

The GHS09CC is compatible with vacuum, high-vacuum (10⁻⁹ mbar), and inert-gas environments. Its ceramic LCC housing meets NASA-STD-6016B outgassing limits (<1.0% TML, <0.1% CVCM) and is certified for use in Class 100 cleanrooms. Electrical interface adheres to IEC 61000-4-2 (ESD immunity ≥8 kV contact) and IEC 61000-4-4 (EFT robustness ≥2 kV). For regulated applications—including GLP-compliant magnetic field mapping in pharmaceutical MRI facility qualification—the sensor supports audit-ready calibration traceability to NIST SRM 2500 series standards via optional factory-provided calibration certificate (ISO/IEC 17025:2017 accredited).

Software & Data Management

While the GHS09CC operates as a passive analog transducer, SPL provides open-source Python and LabVIEW drivers (GitHub-hosted, MIT licensed) supporting real-time acquisition synchronization with NI PXIe-4499 or Keysight 34972A DAQ systems. All delivered units include a digital calibration dataset (CSV + HDF5) containing temperature-dependent sensitivity (S(T)), offset (V_R0(T)), and nonlinearity coefficients up to 9th order. Data logs comply with FDA 21 CFR Part 11 requirements when used with validated acquisition software featuring electronic signatures, audit trails, and role-based access control. Raw voltage outputs are fully compatible with MATLAB’s Signal Processing Toolbox for adaptive filtering, Allan deviation analysis, and drift-compensated field stabilization algorithms.

Applications

• Precision mapping of fringe fields and gradient profiles in superconducting magnet assemblies (e.g., MRI, particle accelerator dipoles)
• In-situ magnetic field monitoring during low-temperature transport measurements (2D materials, topological insulators, heavy fermion compounds)

<liClosed-loop field stabilization in quantum computing control stacks requiring <100 pT RMS stability over 24 h

• Calibration reference for fluxgate and SQUID magnetometers per ISO/IEC 17025:2017 Clause 6.4.10
• Non-contact rotational position sensing in cryogenic turbo-molecular pumps where conventional encoders fail
• Spacecraft attitude determination subsystems meeting ECSS-E-ST-20-07C radiation tolerance thresholds (10 krad(Si) TID)

FAQ

Is the GHS09CC suitable for AC magnetic field measurements?
Yes—its bandwidth extends to 100 kHz (−3 dB point) when operated with ≤100 nA bias current and terminated into 50 Ω; full spectral noise density data is provided in the datasheet for harmonic distortion analysis.
Can it be mounted directly on a sapphire cold finger?
Yes—the ceramic LCC package exhibits CTE matching within ±2 ppm/K of sapphire between 4 K and 300 K; thermal stress modeling per ANSYS Mechanical confirms <0.5 MPa interfacial shear at 1.8 K under 1 g acceleration.
Does SPL provide NIST-traceable calibration certificates?
Yes—optional calibration includes field sweep data at three temperatures (1.8 K, 77 K, 295 K) against a primary-standard NMR teslameter (NIST-traceable, uncertainty <0.005% k=2) and is issued with ISO/IEC 17025:2017 accreditation.
What is the recommended readout circuit topology for sub-pT resolution?
A dual-stage, ultra-low-noise JFET-input instrumentation amplifier (e.g., TI OPA1611) followed by a 24-bit delta-sigma ADC (Analog Devices AD7768-1) operating at 128 kSPS yields <50 pT RMS noise floor in 0.1–10 Hz band, as verified in independent PTB intercomparison studies.
Is the sensor susceptible to radiation-induced displacement damage?
No—graphene’s sp² lattice exhibits >10× higher displacement threshold energy than Si or GaAs; proton irradiation testing (10 MeV, 1 × 10¹⁴ p/cm²) showed no measurable degradation in sensitivity or noise floor.