Abstract
We show theoretically and experimentally that accurate transport measurements are possible even within the short time provided by pulsed magnetic fields. For this purpose, a new method has been devised, which removes the noise component of a specific frequency from the signal by taking a linear combination of the results of numerical phase detection using multiple integer periods. We also established a method to unambiguously determine the phase rotation angle in AC transport measurements using a frequency range of tens of kilohertz. We revealed that the dominant noise in low-frequency transport measurements in pulsed magnetic fields is the electromagnetic induction caused by mechanical vibrations of wire loops in inhomogeneous magnetic fields. These results strongly suggest that accurate transport measurements in short-pulsed magnets are possible when mechanical vibrations are well suppressed.
Highlights
Pulsed magnets allow us to reach magnetic fields much larger than available when using static-field magnets
We revealed that the dominant noise in low-frequency transport measurements in pulsed magnetic fields is the electromagnetic induction caused by mechanical vibrations of wire loops in inhomogeneous magnetic fields
These results strongly suggest that accurate transport measurements in short-pulsed magnets are possible when mechanical vibrations are well suppressed
Summary
Pulsed magnets allow us to reach magnetic fields much larger than available when using static-field magnets. A usual way for achieving a better resolution is to increase the pulse-duration time, i.e., to increase the integration time. This means, to increase the size of the power supply and the magnet, which required substantial initial investment and maintenance costs. Since a large amount of energy dissipates inside the magnet, the time required to cool down the magnet becomes long, restricting the number of pulses per experimental run significantly. To overcome this difficulty, we propose a different approach. III A– III C, we will show that low-noise measurements can be made even in a short time, our method of correcting the phase shift is appropriate, and verify the frequency dependence and how to solve issues related to the simultaneous measurements of multiple samples
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