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Cryogenic scanning Hall-probe microscope with centimeter scan range and submicron resolution
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/content/aip/journal/rsi/76/10/10.1063/1.2072438
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24.The ADC card actually acquires the two wave forms by scanning its ADC between the two inputs, thus the samples are interleaved in time rather than simultaneous. The resultant time shift is corrected before averaging the Hall or sample voltage wave forms.
25.
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26.
26.The ADC card is rated to settle from full range to 1 least-significant bit within . In the interval used here, it would settle to 4 mV, which translates to a magnetic field of 0.1 G, from the maximum value of 1 V.
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28.Such a magnet was designed and built into a Desert Cryogenics probe station by Dr. Douwe Monsma in Professor Charles Marcus’s laboratory at Harvard University.
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29.See, for example, vacuum-compatible stepper motors from tectra GmbH Physikalische Instrumente, http://www.tectra.de, or servo motors from Aerotech, Inc., http://www.aerotech.com
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30.For example, Physik Instrumente (PI) GmbH & Co. KG, http://www.pi.ws, makes closed-loop, stick-slip piezo actuators.
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31.See EXFO Burleigh Products Group Inc.’s motors, http://www.exfo.com, or Bookham Inc. New Focus division’s , http://www.newfocus.com
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/content/aip/journal/rsi/76/10/10.1063/1.2072438
2005-10-04
2014-10-22

Abstract

We have constructed a scanning Hall-probe microscope that combines a scan range with 200 nm positioning resolution by coupling stepper motors to high-resolution drivers and reducing gears. The instrument is uniquely suited for efficient magnetic imaging of mesoscopic devices, media, and materials, operating from 4 K to room temperature with fast turn-around time. Its potential for studying dissipation in coated conductors—high- superconducting tapes—is demonstrated via model systems. We image an entire sample of , then zoom in to individual fluxons. Flux penetration into a single artificial grain boundary is imaged with field resolution and time resolution by averaging over cycles of ac driving current. Using the resulting magnetic movie, we map out ac power losses.

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Scitation: Cryogenic scanning Hall-probe microscope with centimeter scan range and submicron resolution
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/10/10.1063/1.2072438
10.1063/1.2072438
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