Kerr magnetometer

Further information

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 3 μm (polar) 3 μm (longitudinal/transverse). 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.

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