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Investigations on compensated ferrimagnetism in the Mn2Co0.5V0.5Al Heusler alloy
Solid State Communications ( IF 2.1 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.ssc.2020.113812
R. Gavrea , R. Hirian , O. Isnard , V. Pop , D. Benea

Abstract We present theoretical and experimental investigations on the electronic and magnetic properties of the Mn2+δCo0.5-δV0.5Al (δ = 0 ÷ 0.08) and Mn2+zCo0.5V0.5-zAl (z = −0.14 ÷ 0.08) Heusler alloys. The electronic band structure calculations by the Korringa-Kohn-Rostoker (KKR) Green's function method show the dependence of the total spin moment on the preferential site occupation for different crystal sites and predict compensated ferrimagnetic behavior for the compounds obtained from Mn2Co0.5V0.5Al by slight variation of composition. Experimental investigations by tuning the Mn content in Mn2Co0.5V0.5Al alloys have been performed in order to achieve the fully compensated ferrimagnetic behavior which is of particular importance for spintronics. The thermo-magnetic measurements show different types of ferrimagnetic behavior with the threshold influenced by Mn content: N-type of ferrimagnetic behavior for Mn2+δCo0.5-δV0.5Al, while for the Mn2+zCo0.5V0.5-zAl Heusler alloys a combined N/P-type of behavior, depending on z, is observed: N-type for Mn excess/P-type for Mn deficiency. The Curie temperatures of the investigated alloys show high sensitivity on the Mn content. The results of our study may give an insight on the influence of the composition on the magnetic properties of the Mn2Co0.5V0.5Al alloys in order to adjust their properties and make them suitable for spintronic applications.

中文翻译:

Mn2Co0.5V0.5Al Heusler合金补偿亚铁磁性研究

摘要 我们对 Mn2+δCo0.5-δV0.5Al (δ = 0 ÷ 0.08) 和 Mn2+zCo0.5V0.5-zAl (z = -0.14 ÷ 0.08) Heusler 的电子和磁性能进行了理论和实验研究合金。Korringa-Kohn-Rostoker (KKR) 格林函数方法的电子能带结构计算显示了总自旋矩对不同晶位的优先位点占有的依赖性,并预测了从 Mn2Co0.5V0.5Al 获得的化合物的补偿亚铁磁行为通过轻微的成分变化。已经通过调整 Mn2Co0.5V0.5Al 合金中的 Mn 含量进行了实验研究,以实现对自旋电子学特别重要的完全补偿的亚铁磁行为。热磁测量显示了不同类型的亚铁磁行为,阈值受 Mn 含量的影响:Mn2+δCo0.5-δV0.5Al 为 N 型亚铁磁行为,而对于 Mn2+zCo0.5V0.5-zAl Heusler 合金观察到取决于 z 的组合 N/P 型行为:N 型表示 Mn 过量/P 型表示 Mn 缺乏。所研究合金的居里温度对 Mn 含量显示出高敏感性。我们的研究结果可以深入了解成分对 Mn2Co0.5V0.5Al 合金磁性能的影响,以调整其性能并使它们适合自旋电子应用。N型用于Mn过量/P型用于Mn缺乏。所研究合金的居里温度对 Mn 含量显示出高敏感性。我们的研究结果可以深入了解成分对 Mn2Co0.5V0.5Al 合金磁性能的影响,以调整其性能并使它们适合自旋电子应用。N型用于Mn过量/P型用于Mn缺乏。所研究合金的居里温度对 Mn 含量显示出高敏感性。我们的研究结果可以深入了解成分对 Mn2Co0.5V0.5Al 合金磁性能的影响,以调整其性能并使它们适合自旋电子应用。
更新日期:2020-03-01
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