Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments. (2nd May 2018)

• Record Type: Journal Article
• Authors: Keller, Sascha; Mihalceanu, Laura; Schweizer, Matthias R; Lang, Philipp; Heinz, Björn; Geilen, Moritz; Brächer, Thomas; Pirro, Philipp; Meyer, Thomas; Conca, Andres; Karfaridis, Dimitrios; Vourlias, George; Kehagias, Thomas; Hillebrands, Burkard; Papaioannou, Evangelos Th
• Is Part Of: New journal of physics. Volume 20:Number 5(2018:May)
• Publication Date: 2018-05-02
• Subjects: spin pumping -- inverse spin Hall effect -- molecular beam epitaxy -- interface engineering -- metallic spintronics -- thin films; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/aabc46
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We report on the determination of the spin Hall angle in ultra-clean, defect-reduced epitaxial Pt films. By applying vector network analyzer ferromagnetic resonance spectroscopy to a series of single crystalline Fe (12 nm) /Pt ( t Pt ) bilayers we determine the real part of the spin mixing conductance (4.4 ± 0.2) × 10 19 m −2 and reveal a very small spin diffusion length in the epitaxial Pt (1.1 ± 0.1) nm film. We investigate the spin pumping and ISHE in a stripe microstucture excited by a microwave coplanar waveguide antenna. By using their different angular dependencies, we distinguish between spin rectification effects and the inverse spin Hall effect. The relatively large value of the spin Hall angle (5.7 ± 1.4)% shows that ultra-clean e-beam evaporated non-magnetic materials can also have a comparable spin-to-charge current conversion efficiency as sputtered high resistivity layers.