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Updated: May 27, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
NMR field-cycling at ultralow magnetic fields
B Kresse1, A F Privalov, F Fujara
1Institut für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany. benjamin.kresse@physik.tu-darmstadt.de
Abstract:
The paper describes some significant technical improvements of a home built NMR field cycling relaxometer [O. Lips, A. Privalov, S. Dvinskikh, F. Fujara, J. Magn. Reson. 149 (2001) 22-28] now allowing for fast switching of polarization fields (up to more than 1T) to evolution fields down to the sub-μT range. The most important instrumental details such as the description of an involved 3-dimensional resistive coil setup are given. Fields below about 5 μT can only be stabilized by incorporation of an active field drift and fluctuation compensation tool. In this way, the smallest 1H Larmor frequency obtained and measured so far has been 12 Hz.
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