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Proceedings Paper

Spin-Hall effects and unconventional anomalous Hall effects in transition-metal based metallic spintronic multilayers for THz emission (Conference Presentation)
Author(s): Henri Jaffrès; Thi-Huong Dang; Quentin Barbedienne; Jean-Marie George; Nicolas Reyren; Sophie Collin; Paolo Bortolotti; Hanond Nong; Jerome Tignon; Sukhdeep Dhillon; Laurent Divay; Laurent Vila; Paul Noël
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Paper Abstract

It was recently reported that THz emission can be realized in ferromagnetic (FM) /non-FM bilayers via dynamical spin-to charge conversion originating from interfacial spin-orbit coupling or inverted spin-Hall effect (ISHE) [1-3]. We will present our results of THz emission provided by optimized grownth bilayers composed of a high-spin orbit material (Pt, Au :W) in contact with a thin ferromagnetic layer Co/Pt, NiFe/Au:W, NiFe/Au:Ta. Those bilayers are used in experiments combining RF-spin pumping and spin-to-charge conversion by ISHE [4-5]. In comparaison with Co/Pt systems, in NiFe/Au:Ta and NiFe/Au:W bilayers provide a smaller signal even though the spin Hall angles for Au:Ta and Au:W are larger than for Pt [6]. This is mainly due to their smaller spin-mixing conductance in comparaison with Co/Pt. We will discuss the role of the generalized spin-mixing conductance on the spin-transport properties and spin-orbit torques involved in the time-dependent diffusion and relaxation phenomena. We demonstrate that the THz signals strongly depend on the spin Hall angle of non-FM metal, spin diffusion length, and spin-mixing conductance. In the structures with large spin-mixing conductance and spin length diffusion, e.g., Co/Pt, the THz signal is comparable to ZnTe signal. It should be a rapid method to know the characteristic of spintronics samples. We have also studied in the static regime the unconventional Anomalous Hall effect (AHE) of Pt/[CoNi]_N multilayers showing up a characteristic AHE spin-inversion from Pt to Au:W samples by proximity effect. We analyze our results in the series of samples: the exact conductivity profile across the multilayers via the 'extended' Camley-Barnas approach [7] and the spin current profile generated by SHE. The values of spin Hall angles in layers are found: -0.2 for Pt (enhanced compared to CPP geometry)In [Co,Ni]N/Pt sample, we show that the transverse current changes from negative (N<20) to positive (N>20) values. [1] T. J. Huisman et al., Nat.Nano 11, 455–458 (2016) [2] T. Seifert et al., Nat.Photo 10, 483-488 (2016) [3] D. Yang et al., Adv.Opt.Mat. 4, 1944-1949 (2016) [4] J.C Rojas-Sanchez et al., PRL. 112, 106602 (2014) [5] P. Laczowski et al, APL 104, 142403 (2014) [6]P. Laczowski et al, Phys. Rev. B 96, 140405(R) (2017) [7] R. E. Camley et al., Phys. Rev. Lett. 63, 664 (1989); J. Barnas et al., Phys. Rev. B 42, 8110 (1990)

Paper Details

Date Published: 18 September 2018
Proc. SPIE 10732, Spintronics XI, 107323K (18 September 2018); doi: 10.1117/12.2320090
Show Author Affiliations
Henri Jaffrès, CNRS/Thales (France)
Thi-Huong Dang, CNRS/Thales (France)
Quentin Barbedienne, CNRS/Thales (France)
Jean-Marie George, CNRS/Thales (France)
Nicolas Reyren, CNRS/Thales (France)
Sophie Collin, CNRS/Thales (France)
Paolo Bortolotti, CNRS/Thales (France)
Hanond Nong, Lab. Pierre Aigrain (France)
Jerome Tignon, Lab. Pierre Aigrain (France)
Sukhdeep Dhillon, Lab. Pierre Aigrain (France)
Laurent Divay, Thales Research & Technology (France)
Laurent Vila, SPINTEC, CEA, Univ. Grenoble Alpes (France)
Paul Noël, SPINTEC, CEA, Univ. Grenoble Alpes (France)

Published in SPIE Proceedings Vol. 10732:
Spintronics XI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffrès, Editor(s)

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