Kerr magnetometer

NanoMOKE3 from Durham Magneto Optics

The NanoMOKE3 offers high performance laser magnetometry and video-rate Kerr microscopy in a single machine. It is sensitive to the longitudinal, transverse and polar magneto optical Kerr effects and is ideally suited to measuring the magnetic properties of thin magnetic films and magnetic nanostructures.

Ultra-high sensitivity
Highly focused laser spot
Combines Kerr magnetometry and microscope
Images with a rate of up to four frames per second
Newly designed head which includes and protects all optical components

An Ultra-high sensitivity and stability combined with very low noise is established by detecting reflectivity changes smaller than 0.02% and polarization changes smaller than 0.5 mdeg with a measurement time of just a few seconds.

Fully automated integrated optics is used, so no laser beams or optics have to be aligned. Simply place the optics head in front of the sample, adjust the focus, null the detector and start using the software.

Depending on the objective lens selected, the laser spot can be focused to as small as 2µm. This allows hysteresis loops to be measured from small numbers of nanostructures selected out of an array, high hysteresis loop sensitivity to be achieved in single isolated nanostructures or sharp domain images to be captured.

Built on technology developed for confocal microscopy and optical coherence tomography, NanoMOKE3 includes a pair of high speed precision galvanometric mirrors which move the focused laser beam under computer control. This allows measurements to be made from precisely defined positions on the sample surface and for video-rate imaging by rapid rastering of the laser. This eliminates the traditional divide between Kerr magnetometers and Kerr microscopes: NanoMOKE3 is a true hybrid, offering excellent performance in each role.

Bright, sharp, large field of view and high resolution images can be taken in polar Kerr, longitudinal Kerr and reflectivity contrast modes. Frame rates of up to four frames per second allow domain images to be viewed in real time; photographic capture quality allows a publishable quality image to be recorded in seven seconds.

Auxiliary electronic inputs and outputs allow NanoMOKE3 to be connected electronically to your own experiments. The auxiliary laser input port allows NanoMOKE3 to use an existing laboratory laser instead of the built-in laser. Different objective lens can be selected from a wide range to fit resolution, field of view and working distance according to the experimental needs. Most third-party cryostats, cryogen-free cryocoolers and electromagnets can be successfully interfaced.

Supplied with LX Pro 3, Durham Magneto Optics easy-to-use and flexible control software.

Measurements with the NanoMOKE3 are commonly made during research and development into:
  • Magnetic nanotechnology
  • Magnetic random access memory (MRAM)
  • Recording heads
  • Patterned magnetic media
  • Spintronics/magneto-electronics
  • Thin film magnetism
  • Magnetic field sensors

“We confirm that we run the NanoMOKE3 system from Durham Magneto Optics (DMO) , including the Quadrupole- and Dipole-Magnets, the longitudinal/transversal and polar MOKE optics in our laboratory. The NanoMOKE3 fulfills all technical specifications as well as the more stringent specifications reported in the “On site Acceptance Test” document signed during the installation. We further take the opportunity to acknowledge the very courteous service provided by LOT-QD, and especially also the service directly provided from DMO.”

- Eberhard Goering, Max-Plank-Institut für Intelligente Systeme, Stuttgart, Germany


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+33 1 69194949
Fax: +33 1 69194930

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