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Post by kvecers on Dec 28, 2017 22:47:16 GMT -5
We are using the lakeshore cryogenic hall effect measurement system model 7740A, presently we were using square shape samples for the measurement.
But now we like to measure the hall effect for circular samples in this system, can you please guide us how to use and the procedure to use circular samples for the measurement.
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Admin
Administrator 
Posts: 24
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Post by Admin on Dec 29, 2017 23:13:20 GMT -5
Hi Kvecers.
The Lake Shore product expert that would have the best answer to your question is on holiday for Christmas and the New Year.
We will be back in the building in a couple days, on Tuesday January 2nd. I’ll be sure to have a proper response to your question early next week. Thanks!
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Post by Lake Shore Jeff L on Jan 2, 2018 17:08:57 GMT -5
The procedure for measuring circular samples is the same as the procedure for square samples. The requirements for the van der Pauw method requires four contacts on the edge of the sample. The size and shape of the sample is not important. The position of the contacts should be symmetric for best results. I would recommend positioning the contacts on the edge of the circle and space 90 degrees apart.
The same measurement procedure you use for the square sample can be used with the circular sample
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