Abstract

This study is aimed at developing new experimental methods for investigating the magnetic and thermodynamic properties of solid magnetic materials near phase transitions in high magnetic fields with the use of polycrystalline Gd as an example. The magnetocaloric effect and the magnetization of Gd samples at ambient temperatures in quasi-stationary and pulsed magnetic fields up to 40 kOe are simultaneously measured using two different methods. The results of experiments obtained by different methods are compared, and the effect of eddy currents on the results is evaluated. The maximum value obtained for the magnetocaloric effect in Gd samples is ΔT = 7.3 K at T₀ = 299.3 K in a pulsed magnetic field of 40 kOe.

中文翻译：

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钆在高达 40 kOe 的准静止和脉冲磁场中的磁热效应和磁化

摘要

本研究旨在开发新的实验方法，以多晶 Gd 为例，研究高磁场中固体磁性材料在相变附近的磁性和热力学性质。使用两种不同的方法同时测量 Gd 样品在环境温度下在高达 40 kOe 的准静态和脉冲磁场中的磁热效应和磁化强度。比较了不同方法得到的实验结果，并评估了涡流对结果的影响。在 40 kOe 的脉冲磁场中，在T ₀ = 299.3 K 时，Gd 样品中磁热效应的最大值为 Δ T = 7.3 K。