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High Sensitivity Laser Based Magneto-Optical Kerr Effect Station Print
Model No: HO-MOKE LB215

HOLMARC MOKE LB215 is an easy to use magneto-optical Kerr effect (MOKE) laser based system which provides for a convenient way to obtain the changes in magnetic moment at different fields and temperatures. Diode lasers having wavelength of 408nm, 532nm and 650nm are used for the measurements.

Lock-in amplifier technique is employed in this instrument and the modulation is performed with a optical modulator. Sample is mounted in the center of the magnet with its surface either parallel or perpendicular to the field.

The supplied high field, variable gap, dipole electromagnet allows the user to apply large fields (approx. 20,000 Gauss at 10 mm pole gap) in a longitudinal or perpendicular geometry to study hard magnetic materials. HOLMARC MOKE LB215 is supplied with ORMS software which performs data collection and data manipulation with speed and accuracy.

The magneto-optical Kerr effect is a well established technique to study magnetization properties. The effect is based on the fact that the plane of polarization of light is rotated when the light is reflected from a magnetic material. The physical origin of MOKE is the magnetic circular dichroism effect: exchange and spin-orbit coupling in a magnetic material lead to different absorption spectra for left- and right-circularly polarized light. Measuring the change of the polarization of the reflected beam (often referred to as Kerr angle θKerr) gives access to the Kerr magnetization state of the sample.

    Laser wavelengths : 408nm, 532nm, 650nm diode lasers
    Optical rotation sensitivity : 0.001 Degree(Kerr rotation angle)
    Optical rotation resolution : ± 0.005 Degree
    Ellipticity measurement : ± 0.01 deg.
    Optical rotation measuring range : ± 6 deg.
    Spot size : 0.1mm (Variable)
    Electromagnet unit : PC controlled constant current operation
    Max. magnetic field : 20,000 Gauss @ 10mm pole gap
    Min. field detection : 1 Gauss
    Magnetic field preciseness : ± 0.05 %
    Chiller : 5 ~ 25°C Chilling water (for cooling electromagnet)
    Field detection : Hall probe based (PC based field measurement)
    Feed back of magnetic field : Hall element
    Sample chamber options : High / low temperature sample holder
    Sample moving Stage : X, Y & Z axis positioner with angular tilting
    Travel : X, Y & Z (±5mm) with positioning resolution of 10 Micron
    Software : Spectra ORMS software
A Model : HC 300
  By heater, range from RT to 300°C, PID thermo control
Setting resolution : 0.1°C
B Model : NC 70
  Low temperature measurements (Nitrogen CRYOSTAT)
Chamber to cool sample down to -70°C by liquid nitrogen
Setting resolution : 1°C
C Model : TE 20
  Heating / cooling method by TE cooler
Temperature range, -20 to 40°C
Thermo stability : ±0.1°C
Basic Features
High Sensitivity
The system uses an advanced signal processing technology to get very high sensitivity.
Flexible and Wide Range Magnetic Field
Specially designed electro magnets are able to apply high in-plane and out-of-plane magnetic field continuously tuneable up to 20,000 Gs.
Easy to Operate
Variable temperature measurement or custom designs for special purpose measurements and configurations can be made depending upon customer’s demands.

MOKE is particularly important in the study of ferromagnetic and ferrimagnetic films and materials. In this non-destructive surface sensitive technique, polarization-modulated laser light reflects from a magnetic surface in the presence of a sweeping magnetic field. Since light is an electromagnetic field, the magnetic field of the sample interacts with the light to cause a very slight change in the light's polarization and ellipticity. We measure these changes in the light as an intensity change through nearly crossed polarizers, recording the intensity as a function of the applied magnetic field.

Using this instrument, polar, longitudinal and transverse magneto-optic kerr effect can be studied. Longitudinal and polar configurations are used as routine tools for the magnetic characterizations of films. A dedicated room-temperature set-up provides for quick acquisition of inplane hysteresis loops. These hysteresis loops provide information on the magnetic an isotropy present in the film, and in the case of multi layers on the coupling between the layers. In longitudinal Kerr effect, measurements yields qualitative information regarding alignment of magnetic moments in the surface plane of the sample. Measurement of magnetization component perpendicular to the sample surface can also be studied using this setup.

Configurations for MOKE experiments
There are three configurations of MOKE experiments namely Polar, Longitudinal and Transverse configurations. These arise from the direction of the magnetic field with respect to the plane of incidence and the sample surface.
Polar MOKE
For polar MOKE, the magnetic vector is parallel to the plane of incidence and normal to the reflecting surface.
Longitudinal MOKE
For longitudinal MOKE, the
magnetic field is parallel to
both the plane of incidence
and the sample surface.
Transverse MOKE
For the transverse MOKE geometry, the magnetic field is normal to the plane of incidence.
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