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High Temperature (max. 250 C) 2-Axis Helmholtz Coils

A set of Helmholtz Coils that can generate two-axis magnetic field with operating temperature up to 250 C, suited to calibrating high temperature magnetic sensors/electronics.

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Product Code: SpinCoil-9-11-XY-HT

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The SpinCoil-9-11-XY-HT is a set of Helmholtz Coils that can generate two-axis magnetic field with operating temperature up to 250 C. It is suited to calibrating high temperature magnetic sensors and electronics that are used, for example, in geological exploration equipment and in harsh environment. The building materials use high quality metals, ceramics, and high temperature copper wires for sustainable high temperature (up to 250 C) operation.   

The SpinCoil series of Helmholtz coils are used to generate uniform magnetic field over certain volume in space. Each set of Helmholtz coils consists of two coils in a special arrangement to maximize the spatial volume of uniform magnetic field. The magnetic field generated is propositional to a DC or AC current into the coil. We provide a calibration curve between the field and the strength of DC current, called field-current calibration. We offer standard Helmholtz coils with different dimensions for generating single axis, two-axis, or three-axis magnetic field.

Quality Construction: SpinCoil series of Helmholtz coils use high quality insulating materials for the physical frame. The conducting wires are encapsulated in epoxy for mechanical stability. The physical package and the windings of the wires are manufactured for maximum field uniformity and stability.


Accurate Calibration: We design the Helmholtz coils? physical and electrical parameters based on the theory of electromagnetism. On top of this, we provide an accurate experimental calibration data for each set of Helmholtz coils. Calibration accuracy is 0.4%


Adaptive Platform Design: We provide a set of mounting holes for the sample holder platform in the uniform field region. Customer can also purchase sample holder platform which guarantees central alignment for measuring sample.


Easy Operation: Colored banana connectors on the stand of the Helmholtz coils are used to connect to the external power supply, with each color indicating the polarity of current direction, and hence, the field direction.


Multi-axis Magnetic Field Generation: The SpinCoil series are designed such that single, double, or triple sets of Helmholtz coils can be easily assembled together. As a result, you can generate magnetic field vectors in X, XY, or XYZ coordinates.


Customer centered services: We guarantee our products against defective parts and poor workmanship. In case your SpinCoil is under repair, we will provide you with a loaner, so that the disruption to your measurement is minimized.
The SpinCoil series of Helmholtz coils can be used for multiple purposes.
  • Calibration of magnetic sensors
  • Measurement of magnetoresistance of magnetic or spintronic devices
  • Measurement of Hall effect of magnetic or spintronic devices
  • Measurement of magnetic properties of materials (e.g., magnetic susceptibility)
  • Generation of magnetic field in a moderate to large spatial volume
  • Generation of static or dynamic (e.g., rotating) magnetic field vectors
  • Educational demonstration of magnetic field generation
  • Observation of interaction between magnetic field and magnets
  • Generation of zero field environment by canceling the earth's magnetic field
  • Confinement of plasma inside an evacuated container (e.g., a glass bulb)
  • Use for nuclear magnetic resonance experiment


Technical Specification
Theory of Operation of Helmholtz Coils
The Helmholtz Coils use two identical coils of conductive wire to produce a three dimensional region containing a uniform magnetic field. It achieves such a goal by positioning the coils so that certain field components cancel each other out while other components reinforce each other.
The main parts of the Helmholtz Coils are the two coils of wire. Since the coils are identical in every way, (wire material, wire gauge, resistance, radius R), feeding the same current to both coils will create two identical magnetic fields. The key characteristic of the Helmholtz Coils is how the two coils are placed. Each coil lies along the same axis, and the separation between the coils is equal to each coil?s radius.
When current passes through the coils, the ensuing magnetic fields then interact in important ways in the space between the two coils. Applying the Right Hand Rule, one sees that the fields perpendicular to the common axis run into each other and cancel each other out. The same rule also shows that the fields parallel to the common axis run in the same direction, reinforcing each other. All the canceling and reinforcing leaves a uniform field in a cylindrical volume between the two coils. Specifically, the volume has a radius (r) equal to 25% of coil radius (R) and a length equal to 50% of the distance between the two coils.
Applying the Biot-Savart Law and simplifying the relation between input current and magnetic field strength in the uniform region becomes:

B = (0.8991?10-6 nI)/R


B = field in Tesla           

n = number of turns in a coil      

I  = current in amperes   

R = coil radius in meters

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