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Your pathways to field rotation

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
Contact us for more information

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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
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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. 

  • Sample is fixed - allows for semi-rigid electrical connections to the sample
  • Free space optical access to the sample
  • No need for mechanical drive rods
  • Compatible with fast sample exchange systems
  • Accurate control of field vector through magnet power supply
Contact us to find out more

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Choose the right option

  Magnetic field Number of rotation axes Typical performance Typical configuration
Mechanical/Piezo Rotator <16 T 1 (or 2 if Mechanical and Piezoelectric Rotator are combined) ±180 ° rotation (limited by sample wiring)

14 T TeslatronPT with mechanical rotator measurement probe

Advantages:
- Temperature range from 1.4 to 300 K
- ESD protection integrated into sample holder


Vector Magnet

<9 T

Typical magnets:
6 T vertical (Z), 1 T horizontal (X and Y) axes
9 T vertical (Z), 1 T horizontal (X and Y) axes

 2, 3  2.5 ⁰ tilt full field
1 T rotation sphere
 

Triton 500 with 6/1/1 Vector Magnet and 72 mm bottom-loading sample exchange system

Advantages:
- 10 mK base temperature
- Fast sample exchange
- 14 high frequency and 48 low frequency lines to sample
- Optical access possible

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