Measurement of the angle dependence of magnetostriction in pulsed magnetic fields using a piezoelectric strain gauge

TL;DR

This paper introduces a highly sensitive, versatile piezoelectric strain gauge method for measuring magnetostriction in pulsed magnetic fields, capable of detecting two axes simultaneously at cryogenic temperatures.

Contribution

The paper presents a novel, more sensitive piezoelectric-based technique for magnetostriction measurement that operates in pulsed fields and measures two axes simultaneously, improving upon existing fiber-Bragg grating methods.

Findings

Demonstrated high sensitivity of $1.11\times10^{-11}/\sqrt{Hz}$ in pulsed fields.

Validated the method by measuring magnetostriction in Ca$_3$Co$_{1.03}$Mn$_{0.97}$O$_6$.

Showcased the technique's ability to measure angle dependence in high magnetic fields.

Abstract

We present a high resolution method for measuring magnetostriction in millisecond pulsed magnetic fields at cryogenic temperatures with a sensitivity of $1.11\times10^{-11}/\sqrt{\rm Hz}$. The sample is bonded to a thin piezoelectric plate, such that when the sample's length changes, it strains the piezoelectric and induces a voltage change. This method is more sensitive than a fiber-Bragg grating method. It measures two axes simultaneously instead of one. The gauge is small and versatile, functioning in DC and millisecond pulsed magnetic fields. We demonstrate its use by measuring the magnetostriction of Ca$_3$Co$_{1.03}$Mn$_{0.97}$O$_6$ single crystals in pulsed magnetic fields. By comparing our data to new and previously published results from a fiber-Bragg grating magnetostriction setup, we confirm that this method detects magnetostriction effects. We also demonstrate the small size and versatility of this technique by measuring angle dependence with respect to the applied magnetic field in a rotator probe in 65 T millisecond pulsed magnetic fields.