Challab Nabil, Roussigné Yves, Chérif Salim Mourad, Gabor Mihai, Belmeguenai Mohamed
LSPM-CNRS, UPR 3407, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France.
Center for Superconductivity, Spintronics and Surface Science, Physics and Chemistry Department, Technical University of Cluj-Napoca, Str. Memorandumului No. 28, RO-400114 Cluj-Napoca, Romania.
Materials (Basel). 2023 Feb 7;16(4):1388. doi: 10.3390/ma16041388.
Spin-pumping-induced damping and interfacial Dzyaloshinskii-Moriya interaction (iDMI) have been studied in Pt/CoFeAl/MgO systems grown on Si or MgO substrates as a function of Pt and CoFeAl (CFA) thicknesses. For this, we combined vibrating sample magnetometry (VSM), microstrip ferromagnetic resonance (MS-FMR), and Brillouin light scattering (BLS). VSM measurements of the magnetic moment at saturation per unit area revealed the absence of a magnetic dead layer in both systems, with a higher magnetization at saturation obtained for CFA grown on MgO. The key parameters governing the spin-dependent transport through the Pt/CFA interface, including the spin mixing conductance and the spin diffusion length, have been determined from the CFA and the Pt thickness dependence of the damping. BLS has been used to measure the spin wave non-reciprocity via the frequency mismatch between the Stokes and anti-Stokes lines. iDMI has been separated from the contribution of the interface perpendicular anisotropy difference between Pt/CFA and CFA/MgO. Our investigation revealed that both iDMI strength and spin pumping efficiency are higher for CFA-based systems grown on MgO due to its epitaxial growth confirmed by MS-FMR measurements of the in-plane magnetic anisotropy. This suggests that CFA grown on MgO could be a promising material candidate as a spin injection source via spin pumping and for other spintronic applications.
在生长于硅或氧化镁衬底上的铂/钴铁铝/氧化镁体系中，研究了自旋泵浦诱导阻尼和界面Dzyaloshinskii-Moriya相互作用（iDMI）随铂和钴铁铝（CFA）厚度的变化。为此，我们结合了振动样品磁强计（VSM）、微带铁磁共振（MS-FMR）和布里渊光散射（BLS）。单位面积饱和磁矩的VSM测量表明，两个体系中均不存在磁性死层，在氧化镁上生长的CFA具有更高的饱和磁化强度。通过阻尼对CFA和铂厚度的依赖性，确定了控制通过铂/CFA界面的自旋相关输运的关键参数，包括自旋混合电导和自旋扩散长度。BLS已被用于通过斯托克斯线和反斯托克斯线之间的频率失配来测量自旋波的非互易性。iDMI已从铂/CFA和CFA/氧化镁之间界面垂直各向异性差的贡献中分离出来。我们的研究表明，由于通过面内磁各向异性的MS-FMR测量证实了其外延生长，在氧化镁上生长的基于CFA的体系具有更高的iDMI强度和自旋泵浦效率。这表明，在氧化镁上生长的CFA可能是一种有前景的材料候选物，可作为通过自旋泵浦的自旋注入源以及用于其他自旋电子学应用。
