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L.O.T.- Oriel is distributor of an ultra-high sensitivity magnetooptical magnetometer from Durham Magneto Optics Ltd. – the NanoMOKE2.
It is sensitive to the longitudinal, transverse and polar magnetooptical Kerr effects and is ideally suited to measuring the magnetic properties of thin magnetic films and magnetic nanostructures. Such measurements are commonly made during research and development into:
 | Magnetic nanotechnology
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| Magnetic Random Access Memory (MRAM)
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| Recording heads
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| Patterned magnetic media
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| Spintronics
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| GMR / TMR
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| Thin film magnetism
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| Magnetic field sensors |
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The key features of the NanoMOKE2 are:
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| Ultra-high sensitivity and stability combined with a very low noise: signal changes as small as 0.001% can be detected with a measurement time of just a few minutes. For comparison, a 5 nm thick Permalloy film yields a longitudinal Kerr signal of ~ 2%, i.e. 2000 times greater than the sensitivity.
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| Highly focused laser spot: depending on the objective lens selected, the laser spot can be focused to a size between 2.8 µm and 5.5 µm. This allows small numbers of nanostructures to be selected out of a dense array or a high sensitivity to be achieved to single isolated nanostructures.
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| Very advanced sample location features: an optical microscope is built into the laser beam path so that the focused laser spot and the sample surface can be viewed together. The sample sits on a robotic motion stage which allows the focused laser spot to be placed to within < 1 µm precision. A unique raster scanning feature allows magnetic features that are too small to be seen under the optical microscope to be sharply identified.
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| Flexible and open design. All optical components are mounted on a standard optical table, allowing you to make modifications to suit your on research and development requirements.
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| The LX Pro is an easy to use and flexible control software and allows the sample to be moved so as to locate specific areas, allows complex applied field patterns to be easily generated, records hysteresis loops and allows post-processing of the loops to filter noise, remove artefacts and calculate switching field distributions. LX Pro also creates over 150 different object oriented properties and methods that can be used to interface NanoMOKE2 to other software routines that you may wish to write.
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| Options: X – Y stages with a total travel of 150 mm, temperature control unit (4.2 K – 500 K). |
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| Hysteresis loop measured from a single 5 nm thick Permalloy nanowire, 200 nm wide and 18 µm long made by electron beam lithography. 11 seconds acquisition time, 27 Hz loop sweeping frequency. Longitudinal Kerr ellipticity. The focused spot size was 3.3 µm. |
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