Anisotropy-Driven Anomalous Inverse Orbital Hall Effect in Fe Films

Abstract

This study investigates the anomalous orbital effects in iron (Fe) films with strong uniaxial anisotropy, highlighting the interactions between spin and orbital currents. Using heterogeneous YIG/Fe and YIG/Pt/Fe structures, fabricated by oblique deposition in a magnetic field, spin pumping ferromagnetic resonance (SP-FMR) measurements were performed. It was observed that the uniaxial anisotropy enables the emergence of spin-to-charge (AISHE) and orbital-to-charge (AIOHE) conversion signals in out-of-plane configurations, where the spin polarization is parallel to the direction of the spin current. Experimental analysis revealed that orbital dynamics, mediated by orbital Hall conductivity, are more prominent in Fe films due to the low spin-orbit interaction (SOC) and high orbital response. These findings provide fundamental insights for the advancement of orbitronics devices, indicating the potential for controlling orbital and spin currents through magnetic and anisotropic parameters.

6 pages, 5 figures, 3 tables

References in corpus (5)

• Orbitronics: Orbital Currents in Solids
• Spin Injection and Detection via the Anomalous Spin Hall Effect in a Ferromagnetic Metal
• Y3Fe5O12 Spin Pumping for Quantitative Understanding of Pure Spin Transport and Spin Hall Effect in a Broad Range of Materials
• Orbitronics in Two-dimensional Materials
• Quantum Kinetic Theory of the Linear Response for Weakly Disordered Multiband Systems