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 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

Technical Specifications:

Field Sensitivity: less than 15 fT/√Hz in 1-100 Hz band
Dynamic Range: ±5 nT
Measurement Axes: Z-axis only / Y-axis only / Dual Z & Y axes (simultaneous)
Standoff: <6 mm (center of the vapor cell to outside of housing)
Calibration: Internal reference (automated)
Signal Outputs: Analog, USB Digital
Dimensions: 13x19x110 mm (sensor) / 3.1×11.0x16.5 cm (electronics)
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 30 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+: $8,000
Please call for pricing for larger volumes or potential OEM applications. Prices expected to reduce in future as market develops and sales volume grows.

Related Links

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

Selected Publications

[U. Nottingham] A new generation of magnetoencephalography: Room temperature measurements using optically pumped magnetometersNeuroimage 2017
[U. Arkansas] Fetal magnetocardiography using OPM: a more adaptable and less expensive alternative? Prenatal Diagnosis 2017
[Los Alamos Natl. Labs] Ultra-sensitive Magnetic Microscopy with an Optically Pumped Magnetometer, Nature Scientific Reports 2016
[QuSpin] A compact, high-performance atomic magnetometer for biomedical applications, Phys Med. Biol. 2013