Tunable Enhancement of Magnetization Dynamics by Crystal Cut at Interface Exchange Coupled $\alpha$-Fe${}_2$O${}_3$/NiFe Heterostructures

Abstract

We investigate spin dynamics in $\alpha$-Fe${}_2$O${}_3$/Ni${}_{80}$Fe${}_{20}$ (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 $\alpha$-Fe${}_2$O${}_3$ and the magnetization of the Py layer is highly tunable across the Morin transition temperature $(T_M)$. 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.

References in corpus (11)

• Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films
• Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
• Dual Behavior of Antiferromagnetic Uncompensated Spins in NiFe/IrMn Exchange Biased Bilayers
• Long-distance propagation of high-velocity antiferromagnetic spin waves
• Antiferromagnetic magnon spintronic based on non-reciprocal and non-degenerated ultra-fast spin-waves in the canted antiferromagnet α-Fe2O3
• Steadfast perpendicular exchange coupling in an ultrathin CoO/PtFe double-layer: strain and spin orientation
• Note: Derivative divide, a method for the analysis of broadband ferromagnetic resonance in the frequency domain
• Antiferromagnetic resonance in $\alpha$-Fe${}_2$O${}_3$ up to its Néel temperature
• Spin wave dispersion of ultra-low damping hematite ($\alpha {\text{-Fe}}_2{\text{O}}_3$) at GHz frequencies
• Magnetic properties of hematite revealed by an ab initio parameterized spin model
• Coupling of ferromagnetic and antiferromagnetic spin dynamics in Mn${}_2$Au/NiFe thin-film bilayers

Cited by in corpus (1)

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