Crystalline Orientation–Dependent Spin Hall Effect in Epitaxial Platinum

Abstract

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 <002> 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.

Спиновый Эффект Холла В Поликристаллических Образцах Немагнитных Металлов Пятого И Шестого Периодов

“…В последнее время особое внимание уделяется исследованию влияния структуры эпитаксиальных пленок металлов на спин-зависимые транспортные свойства. Так, показано, что в некоторых случаях в поликристаллических образцах наблюдается увеличение угла СЭХ по сравнению с таковым для монокристаллических [4].…”

The spin Hall effect in polycrystalline samples of nonmagnetic fifth- and sixth-period metals

“…Particular attention has been paid in recent studies to the influence of the structure of epitaxial metal films on spindependent transport properties. Specifically, it has been demonstrated that the SHE angle in certain polycrystalline samples increases relative to the corresponding angle in single-crystalline ones [4].…”