Your PATHWAYS to magnetic field orientation

Bulk materials are routinely characterised using electrical resistivity measurements as a function of temperature, pressure doping and applied field. However, as the dimensionality of the sample decreases, the orientation of the magnetic field to the sample becomes more important.

For highly anisotropic materials, the alignment of the field to the sample allows for the study of exotic phases of matter including electron gases in semiconductors and topological insulators.

As the dimensions further decrease, magnetic fields can be used to control electron transport, revealing new physics such as Majorana fermions and quantised transport.

The challenges

With no access to the sample, how could I adjust the orientation of the field to the sample?
How can I maintain electrical contact with the sample?
How could I rotate a large magnetic field relative to the sample?
How can I probe the Fermi surface of my sample?
How can I correct for any misalignment of my sample to the magnetic field?

We have the solution

Mechanical Rotator

For measurements requiring high magnetic fields, a mechanical motor can be used to rotate the sample within the magnetic field. Flexible electrical connections are possible with a rotating sample.

Combining the mechanical drive rod with a stepper motor at room temperature, allows the sample angle to be set accurately
Allows access to larger magnetic fields than a vector magnet

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Application note

Customer story

Published paper

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Piezoelectic Rotator

For measurements where a high magnetic field is required, but where it is not possible to install a drive rod a piezoelectric rotator can be used. In this configuration the rotator is driven electrically and an encoder can be used to determine the angle of the sample

Allows access to larger magnetic fields than a vector magnet
Electrically driven
Can be installed on systems where a mechanical drive rod will not fit
Simplified design, no requirement for a mechanical linkage between sample and room temperature
When combined with a mechanical rotator, it allows rotation in multiple axes

Contact us for more information

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Vector magnet

A vector magnet, comprising 2 or more orthogonal superconducting coils allows the field orientation to be controlled by varying the current in each coil. This allows for the field to be swept through complex paths in multiple axes.

With the sample that is fixed, measurements requiring higher frequency lines or optical access to the sample are possible.