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首页> 外文期刊>Journal of Applied Physics >Dynamic spin-spin interactions in magnetically concentrated Ⅱ_(1-x)Mn_xⅥ semiconductors: A study by high-field electron paramagnetic resonance
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Dynamic spin-spin interactions in magnetically concentrated Ⅱ_(1-x)Mn_xⅥ semiconductors: A study by high-field electron paramagnetic resonance

机译：磁性集中的Ⅱ_（1-x）Mn_xⅥ半导体中的动态自旋-自旋相互作用：高场电子顺磁共振研究

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摘要

High-field electron paramagnetic resonance (EPR) is used to investigate two magnetically concentrated Ⅱ_(1-x)Mn_xⅥ alloys, Cd_(1-x)Mn_xSe and Cd_(1-x)Mn_xSe, for x > 0.15. Earlier EPR studies carried out between 9.0 and 35 GHz had shown that the EPR linewidths in Ⅱ_(1-x)Mn_xⅥ alloys are determined by anisotropic Dzyaloshinskii-Moriya superexchange. However, broadening of the resonance prevented those early EPR studies to be performed at high Mn concentration x and low temperature T, i.e., precisely when Ⅱ_(1-x)Mn_xⅥ systems become magnetically most interesting. We circumvent this problem by performing EPR measurements at high magnetic fields, using frequencies between 95 and 380 GHz. In addition to information on resonance broadening, the ability to measure EPR at very high x and low T (i.e., when the magnetic moments are very strongly coupled) revealed significant shifts of the resonance from the EPR position of Mn~(++) ions. We tentatively ascribe these shifts to internal fields produced by the spin sublattice within the Ⅱ_(1-x)Mn_xⅥ alloy.
机译：利用高场电子顺磁共振（EPR）研究了x> 0.15时两种磁浓缩的Ⅱ_（1-x）Mn_xSe合金，Cd_（1-x）Mn_xSe和Cd_（1-x）Mn_xSe合金。在9.0至35 GHz之间进行的较早的EPR研究表明，Ⅱ_（1-x）Mn_xⅥ合金中的EPR线宽是由各向异性Dzyaloshinskii-Moriya超交换确定的。然而，共振的扩大阻止了那些早期的EPR研究在高Mn浓度x和低温T下进行，也就是恰好在Ⅱ_（1-x）Mn_xⅥ系统成为磁性最重要的时候。我们通过在高磁场下使用95至380 GHz之间的频率进行EPR测量来规避此问题。除了有关共振拓宽的信息外，在非常高的x和低的T下测量EPR的能力（即，当磁矩非常强烈地耦合时）还显示出共振从Mn〜（++）离子的EPR位置发生了显着偏移。我们尝试将这些位移归因于Ⅱ_（1-x）Mn_xⅥ合金内自旋亚晶格产生的内部场。

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