竞争性铁磁和反铁磁相互作用驱动Gd55Co30NixAl15-x微丝的磁热可调谐性
Competing ferromagnetic and antiferromagnetic interactions drive the magnetocaloric tunability in Gd55Co30NixAl15-x microwires
摘要：
以Gd 55 Co 30 NixAl 15-x（x = 10，5和0）非晶微丝为模型系统，研究了多种磁相互作用对Gd合金微丝系统磁性和磁热行为的影响。我们的研究表明，除了RKKY铁磁（FM）相互作用（Gd-Gd），反铁磁（AFM）相互作用（Gd-Co，Gd-Ni）共存，并有助于系统的磁和磁热响应。Al元素对FM Gd-Gd相互作用的稀释作用是导致居里温度（TC）降低的原因，而饱和磁化强度（MS）的增加则源于AFM Gd-Ni相互作用的降低。一个彻底的分析表明，临界指数的AFM相互作用的存在下，阻碍了系统表现出远距离FM低于TC的顺序。调整这些相互作用，以保持大的制冷剂容量（RC），同时调整TC在很宽的温度范围内，这是理想的主动磁制冷。
英文摘要：
We have employed Gd55Co30NixAl15-x (x = 10, 5 and 0) amorphous microwires as a model system to unravel the impact of multiple magnetic interactions on the magnetism and the magnetocaloric behavior in Gd-alloy microwire systems. Our study shows that in addition to the RKKY ferromagnetic (FM) interaction (Gd-Gd), antiferromagnetic (AFM) interactions (Gd-Co, Gd-Ni) coexist and contribute to the magnetic and magnetocaloric response of the system. The dilution effect of Al element on the FM Gd-Gd interaction is responsible for the decrease of the Curie temperature (TC), whereas the increase of the saturation magnetization (MS) is originated from the reduced AFM Gd-Ni interaction. A thorough analysis of critical exponents suggests that the presence of the AFM interactions hinders the system to exhibit a long-range FM order below the TC. Adjusting these interactions is shown to preserve the large refrigerant capacity (RC) while tuning the TC over a wide temperature range, which is desirable for active magnetic refrigeration.
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