Miniature capacitive Faraday force magnetometer for magnetization measurements at low temperatures and high magnetic fields

Dominic Blosser; Leonardo Facheris; Andrey Zheludev

doi:10.1063/5.0005850

paper

Miniature capacitive Faraday force magnetometer for magnetization measurements at low temperatures and high magnetic fields

arXiv:2002.10168 · doi:10.1063/5.0005850

Abstract

A Faraday force magnetometer is presented for measurements of magnetization at temperatures down to 100~mK and in magnetic fields up to 14~T. The specimen is mounted on a flexible cantilever forming a force-sensing capacitor in combination with a fixed back plate. Two different cantilever designs are presented. A torsion resistant cantilever allows to measure magnetization of highly anisotropic single crystal samples. Measurements of the metal organic quantum magnets (C $_{5}$ H $_{12}$ N) $_{2}$ CuBr $_{4}$ (BPCB) and NiCl $_{2}$ $\cdot$ 4 SC(NH $_{2}$ ) $_{2}$ (DTN) demonstrate the device's capabilities. Routinely, a specimen's magnetic moment is measured with a resolution better than $1 0^{- 7}$ Am $^{2}$ ( $1 0^{- 4}$ emu). The device in miniaturized to fit is almost any cryostat.