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Magneto-Optic Kerr Effect (MOKE)

 

In physics the magneto-optic Kerr effect (MOKE) or the surface magneto-optic Kerr effect (SMOKE) is one of the magneto-optic effects. It describes changes of the reflections from the magnetized media. It is similar to the Faraday effect that describes the light passing through the media. The light that is reflected from a magnetized surface, changes in polarization.

 

 

Kerr Rotation Angle: the amount of rotation (in radians) induced in the reflected beam

 

 

 

Kerr Ellipticity: ratio between the minor and major axis of the ellipse induced in the reflected beam

This phenomenon is known as the Magneto-Optic Kerr Effect (MOKE).

 

Faraday Effect (in transmission) and Kerr effect (in reflection)

 

MOKE can be further categorized by the direction of the magnetization vector with respect to the reflecting surface and the plane of incidence.

 

 

Definition

Purpose

Polar MOKE

The magnetization vector is perpendicular to the reflection surface and parallel to the plane of incidence.

In general gives the largest magnetic rotation. It is also the method which has been studied the most, due to its importance in magneto-optical recording technology.

Longitudinal MOKE

The magnetization vector is parallel to both the reflection surface and the plane of incidence.

Longitudinal MOKE is sensitive to the in-plane magnetization on the surface of the medium. This geometry is useful when studying magnetic elements with shape anisotropy, where the physical dimension of the magnetic medium is small in one direction, e.g. a magnetic ultra-thin film. In particular, longitudinal MOKE has been extensively used to study magnetic domain interactions on the micro and nano scale, as well as magnetic thin film structures.

 

Transversal MOKE

The magnetization is perpendicular to the plane of incidence and parallel to the surface.

Whereas polar and longitudinal MOKE both give rise to a rotation of the polarization plane of the incident light, the transverse effect only results in a modulation of the intensity. This is due to the Kerr component of the reflected light being parallel to the normal Fresnel reflection component in the transverse geometry.

 

WEISTRON NanoMOKE

 

We provide high precision NanoMOKE systems.

View WEISTRON NanoMOKE details, specifications, and more.