AUTHOR=Xiao Yuxuan , Wang Hailong , Fullerton Eric E. 

TITLE=Crystalline Orientation–Dependent Spin Hall Effect in Epitaxial Platinum

JOURNAL=Frontiers in Physics

VOLUME=9

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.791736

DOI=10.3389/fphy.2021.791736

ISSN=2296-424X

ABSTRACT=<p>We report on the spin Hall effect in epitaxial Pt films with well-defined crystalline (200), (220), and (111) orientations and smooth surfaces. The magnitude of the spin Hall effect has been determined by spin–torque ferromagnetic resonance measurements on epitaxial Pt/Py heterostructures. We observed a 54% enhancement of the charge-to-spin conversion efficiency of the epitaxial Pt when currents are applied along the in-plane <inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>&lt;</mml:mo><mml:mn>002</mml:mn><mml:mo>&gt;</mml:mo></mml:mrow></mml:math></inline-formula> direction. Temperature-dependent harmonic measurements on epitaxial Pt/Co/Ni heterostructures compared to a polycrystalline Pt/Co/Ni suggest the extrinsic mechanism underlying spin Hall effect in epitaxial Pt. Our work contributes to the development of energy-efficient spintronic devices by engineering the crystalline anisotropy of non-magnetic metals.</p>