QZFM Gen-3

The QuSpin Zero-Field Magnetometer (QZFM) is an ultra-sensitive vector magnetometer that operates in low field environments. It is among the most sensitive magnetic detectors with performance rivaling superconducting technologies. The sensor head operates at room temperature and fully integrates the laser with other components, eliminating the complexities from fiber optics or cryogenics. Each QZFM is self-calibrating and can simultaneously measure field components along two or three axes. The compact electronics module with a dedicated microprocessor provides all necessary functionality to simply operate the sensor with a few clicks of the mouse.

→ No consumables, no fiber optics, completely standalone

Gen-3 release notes

Technical Specifications:

Field Sensitivity:
Dual Axis Variant: <15 fT/√Hz in 3-100 Hz band (typical 7-10 fT/√Hz)
Triax Variant: <23 fT/√Hz in 3-100 Hz band (typical 15 fT/√Hz all axis simultaneous)
Dynamic Range: ±5 nT
Measurement Axes:
Dual Axis Variant: Z-axis only / Y-axis only / Dual Z & Y axes (simultaneous)
Triax Variant: All three simultaneous
Standoff: 6.5 mm (center of the vapor cell to outside of housing)
Calibration: Internal reference (automated)
Signal Outputs: Analog, USB Digital
Dimensions: 12.4×16.6×24.4 mm (sensor) / 3.1×11.0x16.5 cm (electronics) [schematic]
Power consumption: 5W total (0.7 W sensor head)
Cable length: 6.5 m (standard)
Atomic species: Rubidium


Sensor, control electronics, power supply, cables, software


  • Ambient magnetic field below 50 nT
  • 64-bit computer with Windows 7 or later

Key Applications:

Magnetoencephalography (MEG), fetal magnetocardiography (fMCG), magnetic relaxometry, research

**Investigational Device Use Only**

Pricing per sensor (USD):

Qty 1-3: $10,000
Qty 4-7: $8,500
Qty 8-15: $8,000
Qty 16-32: $7,700
Please call for pricing for larger volumes or potential OEM applications.

Related Links

Technical Discussions Forum: Link


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A typical noise floor of the QZFM sensors

A typical noise floor of a QZFM measured inside a small 3-layer mu-metal magnetic shields with an inner ferrite layer. The noise traces include both single and simultaneous dual axis measurements.

QZFM Response vs. Magnetic Field Amplitude