Taking into account the phase fraction during transition for the first-order magnetocaloric materials, an improved isothermal entropy change determination has been put forward based on the Clausius-Clapeyron (CC) equation. It was found that the isothermal entropy change value evaluated by our method is in excellent agreement with those determined from the Maxwell-relation (MR) for Ni-Mn-Sn Heusler alloys, which usually presents a weak field-induced phase transforming behavior. In comparison with MR, this method could give rise to a favorable result derived from few thermomagnetic measurements. More importantly, we can eliminate the isothermal entropy change overestimation derived from MR, which always exists in the cases of Ni-Co-Mn-In and MnAs systems with a prominent field-induced transition. These results confirmed that such a CC-equation-based method is quite practical and superior to the MR-based ones in eliminating the spurious spike and reducing measuring cost.
Giant magnetocaloric effect driven by indirect exchange in magnetic multilayers
磁性多层膜中的间接交换耦合，也称为Ruderman-Kittel-Kasuya-Yosida（RKKY）相互作用，已知在控制磁化的层间排列方面非常有效。这种耦合通常在多层制造阶段固定，并且不允许器件应用所需的非原位控制。除了取向控制之外，还非常期望控制层内磁化的大小，理想地通过切换相关的RKKY耦合来接通/关断层内磁化。在这里，我们展示了一种磁性多层材料，结合热-以及场控制的RKKY交换，集中在一个稀释的铁磁合金层，并驱动它，虽然它的居里转变。薄铁磁体的这种开/关磁化切换在低场扫描内可重复且完全再现地进行，导致巨磁热效应，在~10 mT的外场下估计等温熵变为-10 mJ/K cm ^3，这大大超过了绝热退磁制冷系统中使用的最佳稀土基材料的性能。
Synthesis of La0.5Ca0.5-x xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties
采用蔗糖改性自燃烧法制备了高锰酸盐La0.5Ca0.5-xxMnO 3（LCMO）纳米材料。晶体结构的X射线衍射图的Rietveld细化证实了具有Pbnm空间群的单相斜方晶系（No.62）。在LCMO结构中自愿产生Ca空位，以研究它们对系统中磁行为的影响。磁化率被发现是高度增强的样品与Ca-空位。在254 K附近，两种样品都发生了顺磁-铁磁相变。这种转变的特点是，在样品中的钙空位的磁化率的急剧跳跃。在6 T的磁场下，两种化合物的最大熵变分别为2.30 J kg ~（-1）K ~（-1）和2.70 J kg ~（-1）K ~（-1）。间接法计算的磁热绝热温度变化值为5.6 K和5.2 K的非空位和Ca空位化合物，分别为。在这项工作中报道的Ca-空隙La0.5Ca0.5-xxMnO 3（x=0.05）的磁热效应比LCMO的整体增强。制备LCMO材料的技术有利于提高磁热效应和磁行为。因此，我们得出结论，这种成本较低的环境友好系统可以被认为是磁制冷应用的更有利的候选人，然后通常的Gd基化合物。
Influence of Ni substitution on the phase transitions and magnetocaloric effect of NdCo2 at cryogenic temperatures
Institute for Energy Technology (IFE)（能源技术研究所）；Technical University of Darmstadt（达姆施塔特工业大学）；Helmholtz-Zentrum Dresden-Rossendorf（亥姆霍兹德累斯顿-罗斯多夫中心）；Technische Universität Dresden（德累斯顿工业大学）；Paul Scherrer Institute (PSI)（保罗谢勒研究所）
Enhancement in Magnetic and Magnetocaloric Properties of CoFe2O4 Nanofibers at Lower Temperatures
Cadi- Ayyad University（卡迪·阿亚德大学）；Jozef Stefan Institute（约瑟夫·斯蒂芬研究所）；University of Picardie Jules Verne（皮卡第朱尔·凡尔纳大学）；Institute of Mathematics, Physics and Mechanics & University of Ljubljana, Faculty of Civil and Geodetic Engineering（卢布尔雅那大学土木与测量工程学院数学、物理与力学研究所）
Rotating Magnetocaloric Effect in First-order Phase Transition Material Gd5Si2Ge2
IFIMUP – Institute of Physics for Advanced Materials, Nanotechnology and Photonics（IFIMUP 先进材料、纳米技术和光子学物理研究所）；University of Porto（波尔图大学）；University of Aveiro（阿威罗大学）；Iowa State University（爱荷华州立大学）
Quantized Failure Criteria and Indirect Observation for Predicting the Nanoscale Strength of Materials: The Example of the Ultra Nano Crystalline Diamond
Intergranular and intragranular properties of superconducting multifilamentary Bi 2223 Ag tapes : comparison of electrical transport and magnetic measurement methods
Critical Analysis of Skyrmionic Material Co$_{6.5}$Ru$_{1.5}$Zn$_8$Mn$_4$: a complex interplay of short and long-range interactions around the transition temperature
