AI 中文总结
研究铝掺杂Ni2MnSn0.75Al0.25赫斯勒合金的磁热效应和多磁相，通过温度依赖磁化测量等方法，确定转变温度等参数，证实铁磁交换主导，发现共存相互作用及重入簇玻璃态，磁行为归因于Al替代致交换作用改变与原子无序。
AI 中文摘要
在赫斯勒化合物中，镍基合金因其具有诸如高居里温度等理想特性而被广泛研究，这对先进的磁性和自旋电子学有利。利用Ni2MnSn0.75Al0.25赫斯勒合金研究了铝替代对Ni2MnSn磁基态的影响。温度依赖的磁化测量确定在TC为734K时发生二级顺磁到铁磁转变，随后在263K附近发生一级马氏体转变，显示出强磁结构耦合。韦斯分析得出正的韦斯温度theta CW为746.4K和有效磁矩为6.82muB，证实了铁磁交换相互作用的主导地位。零场冷却和场冷却磁化曲线之间的分叉以及非饱和磁滞M与H回线表明竞争的铁磁和反铁磁相互作用共存。磁性研究确定形成了伴有交换偏置的相互作用重入簇玻璃态。观察到的磁行为归因于铝替代引起的Mn-Mn交换相互作用的改变和相关的原子无序，导致复杂的磁基态。
英文摘要
Among Heusler compounds,Ni based alloys have been extensively investigated because they exhibit desirable properties such as high Curie temperatures, which are advantageous for advanced magnetic and spintronic devices.The effect of Al substitution on the magnetic ground state of Ni2MnSn was investigated using the Ni2MnSn0.75Al0.25 Heusler alloy.Temperature-dependent magnetisation measurements identify a second-order paramagnetic to ferromagnetic transition at TC is 734K,followed by a first-order martensitic transformation near 263K,demonstrating strong magnetostructural coupling.Curie Weiss analysis yields a positive Weiss temperature theta CW is 746.4K and an effective magnetic moment of 6.82muB,confirming the predominance of ferromagnetic exchange interactions. The bifurcation between the ZFC and FCW magnetization curves,together with non saturating hysteretic M vs H loops, indicates the coexistence of competing ferromagnetic and antiferromagnetic interactions.Further magnetic investigations establish the formation of an interacting reentrant cluster glass state accompanied by an exchange-bias effect.The observed magnetic behavior is attributed to the modification of Mn Mn exchange interactions induced by Al substitution and the associated atomic disorder,resulting in a complex magnetic ground state.
Comments27 pages, 13 Figures
