We present experimental and theoretical results of the molecular sensing performance of a novel platform based on magnetic modulation of surface-enhanced infrared absorption spectroscopy. For this, we study the effect that molecular infrared vibrations of a PMMA layer have on the optical and magneto-refractive response of spintronic antennas. Specifically, a periodic array of rods is fabricated from giant-magneto-resistance Au/Ni₈₁Fe₁₉ metallic multilayers, and the effect of depositing a layer of PMMA on top of the array is investigated from both experimental and theoretical points of view. We find that the relative changes induced by the infrared vibrations of PMMA on the magneto-refractive signal are larger than the relative changes induced on the optical transmission. This result indicates that the magneto-refractive response is more sensitive to the excitation of molecular vibrations than the optical response and fosters the development of a novel type of an infrared sensing technique based on spintronic antennas: Magneto-Refractive Surface-Enhanced Infrared Absorption (SEIRA) Spectroscopy.

中文翻译：

---

使用自旋电子-等离激元天线的新型振动光谱：磁折射表面增强的红外吸收

我们介绍了基于表面增强红外吸收光谱的磁调制的新型平台的分子传感性能的实验和理论结果。为此，我们研究了PMMA层的分子红外振动对自旋电子天线的光学和磁折射响应的影响。具体地，由超磁阻Au / Ni ₈₁ Fe ₁₉制成棒的周期性阵列从实验和理论角度研究了金属多层，以及在阵列顶部沉积PMMA层的效果。我们发现，由PMMA的红外振动在磁折射信号上引起的相对变化要大于在光传输上引起的相对变化。该结果表明，磁折射响应对分子振动的激发比光学响应更敏感，并且促进了基于自旋电子天线的新型红外传感技术的发展：磁折射表面增强红外吸收（SEIRA） ）光谱学。