2024/12/18 by Hassan Al-Hamdo, Tobias Wagner, Al-Hamdo, Hassan +19 · 2 citations
Energy · Materials Science · #Alpha (finance) #Condensed matter physics #Dynamics (music) #FOS: Physical sciences #Heterojunction #Iron oxide chemistry and applications #Magnetic Properties and Applications #Magnetic Properties and Synthesis of Ferrites #Magnetic field #Magnetization #Magnetization dynamics #Materials science #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics #Political science #Quantum mechanics
paper · pdf · doi:10.48550/arxiv.2412.14090
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2024/12/18 · openalex created_date 2024/12/21 · openalex updated_date 2026/08/04
We investigate spin dynamics in α-Fe2O3/Ni80Fe20 (Py) heterostructures, uncovering a robust mechanism for in-situ modulation of ferromagnetic resonance (FMR) through precise control of temperature, applied magnetic field and crystal orientation. Employing cryogenic ferromagnetic resonance spectroscopy, we demonstrate that the interfacial coupling between the Néel vector of α-Fe2O3 and the magnetization of the Py layer is highly tunable across the Morin transition temperature (TM). Our experiments reveal distinct resonance behavior for different crystal orientations, highlighting the pivotal role of exchange coupling strength in dictating FMR frequencies. Theoretical modeling corroborates the experimental findings, elucidating the dependence of coupling on the relative alignment of the Néel vector and ferromagnetic magnetization. Notably, we achieve significant modulation of FMR frequencies by manipulating the Néel vector configuration, facilitated by temperature variations, applied magnetic fields and crystal orientation adjustments. These advancements demonstrate the potential for dynamic control of spin interactions in AFM/FM heterostructures, paving the way for the development of advanced spintronic devices with tunable magnetic properties. Our work provides critical insights into the fundamental interactions governing hybrid spin systems and opens new avenues for the design of versatile, temperature-responsive magnetoelectronic applications.