Effect of multi-layering and crystal orientation on spin-orbit torque efficiency in Ni/Pt layer stacking

التفاصيل البيبلوغرافية
العنوان: Effect of multi-layering and crystal orientation on spin-orbit torque efficiency in Ni/Pt layer stacking
المؤلفون: Sud, A., Lau, Y. -C., Brierley, J., Kurebayashi, H., Seki, T.
سنة النشر: 2023
المجموعة: Condensed Matter
مصطلحات موضوعية: Condensed Matter - Materials Science
الوصف: We study spin-orbit torques (SOTs) in Ni/Pt bi-layers and multi-layers by ferromagnetic resonance (FMR) and harmonic-Hall measurements. The effect of multi-layering and crystal orientation on field-like (FL) and damping-like (DL) torque efficiencies is examined by exploiting the samples with different crystal orientations: epitaxial and poly-crystalline structures on Sapphire and SiO$_2$ substrates, respectively. We find that both DL and FL torque efficiencies are larger in multi-layer samples and there is no complete cancellation of torque efficiencies that is generally expected for ideal symmetric stacking structures. The results of SOT-FMR indicate that the epitaxial samples show higher efficiency for SOT generation compared to the poly-crystalline samples, suggesting that SOT generation is modified depending on the interfacial contribution. In addition, the spin Hall conductivity of the epitaxial multi-layer is the largest among the samples. The present results signify the importance of crystal orientation, multi-layering and interface-quality in improving the efficiency of SOTs generation combined with larger spin hall angle for developing future spintronic devices.
نوع الوثيقة: Working Paper
URL الوصول: http://arxiv.org/abs/2311.13835
رقم الأكسشن: edsarx.2311.13835
قاعدة البيانات: arXiv