Gupta Pushpendra, Singh Braj Bhusan, Roy Koustuv, Sarkar Anirban, Waschk Markus, Brueckel Thomas, Bedanta Subhankar
Laboratory for Nanomagnetism and Magnetic Materials (LNMM), School of Physical Sciences, National Institute of Science Education and Research (NISER), HBNI, P.O.-Bhimpur Padanpur, Via-Jatni, 752050, India.
Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, 52425 Jülich, Germany.
Nanoscale. 2021 Feb 4;13(4):2714-2719. doi: 10.1039/d0nr06228f.
Manganites have shown potential in spintronics because they exhibit high spin polarization. Here, by ferromagnetic resonance we have studied the damping properties of La0.67Sr0.33MnO3/Pt bilayers which are prepared by oxide molecular beam epitaxy. The damping coefficient (α) of a La0.67Sr0.33MnO3 (LSMO) single layer is found to be 0.0104. However the LSMO/Pt bilayers exhibit a decrease in α with an increase in Pt thickness. This decrease in the value of α is probably due to high anti-damping like torque. Furthermore, we have investigated the angle dependent inverse spin Hall effect (ISHE) to quantify the spin pumping voltage from other spin rectification effects such as the anomalous Hall effect and anisotropic magnetoresistance. We have observed a high spin pumping voltage (∼20 μV). The results indicate that both anti-damping and spin pumping phenomena occur simultaneously.
锰氧化物由于具有高自旋极化率，在自旋电子学领域展现出了潜力。在此，我们通过铁磁共振研究了采用氧化物分子束外延法制备的La0.67Sr0.33MnO3/Pt双层膜的阻尼特性。发现La0.67Sr0.33MnO3（LSMO）单层的阻尼系数（α）为0.0104。然而，LSMO/Pt双层膜的α值随Pt厚度的增加而减小。α值的这种减小可能是由于类似反阻尼的高扭矩所致。此外，我们研究了角度依赖的逆自旋霍尔效应（ISHE），以量化来自其他自旋整流效应（如反常霍尔效应和各向异性磁阻）的自旋泵浦电压。我们观测到了较高的自旋泵浦电压（约20 μV）。结果表明，反阻尼和自旋泵浦现象同时发生。
