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1-Axis Helmholtz Coils, Diameter 9 inch

A set of 9" diameter Helmholtz Coils that can generate single axis magnetic field.


Product Code: SpinCoil-9-X

4 in stock




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Description
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.
 
The SpinCoil-9-X is a set of 9" diameter Helmholtz Coils that can generate single axis magnetic field.
Features

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 coilsí 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.
Applications
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
Model SpinCoil-7-X SpinCoil-9-X SpinCoil-11-X
Price $1,695 $1,895 $2,095
Axis One-axis One-axis One-axis
Magnetic Field 20 Gauss/A 18 Gauss/A 15 Gauss/A
Max. Continuous Field 40 Gauss 36 Gauss 30 Gauss
Field Uniformity 0.4% within a cylinder 1.75" D and length 0.4% within a cylinder 2.25" D and length 0.4% within a cylinder 2.75" D and length
Total Resistance 18 Ohms 16 Ohms 14 Ohms
Total Inductance 90 mH 100 mH 110 mH
Coil Inner Diameter 7.0 in 9.0 in 11.0 in
Electrical Connector Banana Jacks Banana Jacks Banana Jacks
 
 
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 coilís 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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