American Magnetics MAxes Multi-Axis Magnet systems for Vector Fields - Manual

Multi-Axis Magnet systems for Vector Fields (MAxes
TM
)
American Magnetics, Inc. Multi-Axis (MAxes
TM
) systems
allow the user to easily program an infinite number of high
magnetic field vectors. Our combination of user friendly
electronics, reliable cryogenic vessels, and robust multi-
axis superconducting magnets combine to make our
MAxes
TM
systems an excellent choice for any application
where the outcome is dependent on precise magnetic field
vector orientation. Transport studies on anisotropic
materials at high magnetic fields & low temperatures have
revealed many exciting properties. Even though anisotropic
magneto resistance is a century old phenomena,
advancements in nanotechnology has created increased
importance to attain precision angular control, while
positioning samples in magnetic field. There has been
significant progress in technologies that allow sample manipulation at atomic level, however at sub Kelvin
temperatures, there is limited thermal budget and hence it’s preferable to rotate the magnetic field than
rotating the sample. Additional constraints come into play when systems are cooled using closed cycle
coolers as thermal budget is further restricted. Some of these requirements have pushed advancements in
areas of Multi-axis magnets, as using these it is possible to align samples in magnetic field to an accuracy
of better than 0.01 degrees.
A typical MAxes
TM
magnet is comprised of two or three independently controlled coil sets. A solenoid
coil produces the highest field along one axis. One or two sets of split coils produce fields along the
other 2 axes. By correctly energizing the coils with programmed coil constant a combined vector field
can be produced in a given direction of a known magnitude. This allows users to electronically
manipulate the field relative to the sample without the use of complex sample rotation equipment or
physically rotating the magnet position. Coil configurations could be with the split coils surrounding the
solenoid or the split coils nested inside the bore of a large solenoid. Typical specifications include high
field up to 9 Tesla (T) for the principal axis, having 2.0/3.0 inch vertical clear bore and 1T or 2T rotating
vector using any combination of x, y and z-axis magnets. Users needing higher vector field typically opt
for 2-axis systems.
The following table gives a snap shot sample of the capabilities of our MAxes
TM
systems.
Bore size MX-2 (YZ) 2D Vector field MX-3 (XYZ) 3D Vector field
2.0" 4.5T/9T 4.5T 1T/1T/12T 1T
2T/2T/9T 2T
2.5" 5T/7T 5T 1.5T/1.5T/9T 1.5T
3.0" 5T/6T 5T 1T/1T/9T 1T