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所谓磁制冷,是以磁性体作为工质的一种全新的制冷方式。传统的气体液化制冷,是用压缩机对气体进行加压或减压来实现制冷,而磁制冷则是通过控制加在磁性体上的外磁场,使之产生放热或吸热过程进行制冷。所谓磁性体,是地面上的多种原子中具有磁矩的一类物质,例如像3d 族过渡性金属原子或稀土类原子,即具有小原子磁铁那样的物质。含有上述原子的金属合金称为磁性体化合物。在上述原子磁铁中,由于原子磁铁的热运动,同时存在使原子成排列有序状态的相互作用和打乱这种有序状态的效应。因而,在磁性体的高温区,原子磁铁的热运动激烈,完全处于无秩序状态;相反,在低温区,原子磁铁排
The so-called magnetic refrigeration, magnetic fluid as a working medium is a new cooling method. The traditional gas liquefaction refrigeration, is to use the compressor to pressurize or depressurize the gas to achieve refrigeration, and magnetic refrigeration is by controlling the external magnetic field applied to the magnetic body, so that the heat generation or endothermic process of refrigeration. A magnetic substance is a substance having a magnetic moment among a plurality of kinds of atoms on the ground, such as a group of 3d transition metal atoms or rare earth atoms, that is, a substance having a small atomic magnet. The metal alloy containing the above atoms is called a magnetic compound. In the above-mentioned atomic magnet, there is an effect of causing the atoms to be in an ordered state and disrupting the ordered state due to the thermal movement of the atomic magnet. Therefore, in the high-temperature region of the magnetic body, the thermal movement of the atomic magnet is intense and completely out of order; in contrast, in the low-temperature region, the atomic magnet row