2021/09/13 by K. Sriram, Sriram, Kasilingam, Jay Pala +7
Engineering · Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Other Condensed Matter (cond-mat.other) #Semiconductor materials and devices #ZnO doping and properties
paper · pdf · doi:10.48550/arxiv.2109.06113
openalex publication_date 2021/09/13 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Heavy metal-ferromagnet bilayer structures have attracted great research\ninterest for charge-to-spin interconversion. In this work, we have investigated\nthe effect of the permalloy seed layer on the Ta polycrystalline phase and its\nspin Hall angle. Interestingly, for the same deposition rates the crystalline\nphase of Ta deposited on Py seed layer strongly depends on the thickness of the\nseed layer. We have observed a phase transition from \α-Ta to\n(\α+\β)-Ta while increasing the Py seed layer thickness. The\nobserved phase transition is attributed to the strain at interface between Py\nand Ta layers. Ferromagnetic resonance-based spin pumping studies reveal that\nthe spin-mixing conductance in the to (\α+\β)-Ta is relatively\nhigher as compared to the to \α-Ta. Spin Hall angles of to \α-Ta\nand to (\α+\β)-Ta are extracted from inverse spin Hall effect (ISHE)\nmeasurements. Spin Hall angle of the to (\α+\β)-Ta is estimated to\nbe \θSH=-0.15 which is relatively higher than that of to \α-Ta.\nOur systematic results connecting the phase of the Ta with seed layer and its\neffect on the efficiency of spin to charge conversion might resolve ambiguities\nacross various literature and open up new functionalities based on the growth\nprocess for the emerging spintronic devices.\n