Optimizing Time-resolved Magneto-optical Kerr Effect for High-fidelity Magnetic Characterization

Abstract

Spintronics has emerged as a key technology for fast and non-volatile memory with great CMOS compatibility. As the building blocks for these cutting-edge devices, magnetic materials require precise characterization of their critical properties, such as the effective anisotropy field ($H_{\mathrm{k},\mathrm{eff}}$, related to magnetic stability) and damping ($\alpha$ key factor in device energy efficiency). Accurate measurements of these properties are essential for designing and fabricating high-performance spintronic devices. Among advanced metrology techniques, Time-resolved Magneto-Optical Kerr Effect (TR-MOKE) stands out for its superb temporal and spatial resolutions, surpassing traditional methods like ferromagnetic resonance (FMR). However, the full potential of TR-MOKE has not yet been fully pledged due to the lack of systematic optimization and robust operational guidelines. In this study, we address this gap by developing experimentally validated guidelines for optimizing TR-MOKE metrology across materials with perpendicular magnetic anisotropy (PMA) and in-plane magnetic anisotropy (IMA). Our work identifies the optimal ranges of the field angle to simultaneously achieve high signal amplitudes and improve measurement sensitivities to $H_{\mathrm{k},\mathrm{eff}}$ and $\alpha$. By suppressing the influence of inhomogeneities and boosting sensitivity, our work significantly enhances TR-MOKE capability to extract magnetic properties with high accuracy and reliability. This optimization framework positions TR-MOKE as an indispensable tool for advancing spintronics, paving the way for energy-efficient and high-speed devices that will redefine the landscape of modern computing and memory technologies.

arXiv commentSubmitted to Appl. Phys. Lett. Manuscript: 16 pages, 5 figures; Supplementary Materials: 18 pages, 12 figures

References in corpus (8)

• Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal
• Single pulse all-optical toggle switching of magnetization without Gd: The example of Mn2RuxGa
• Laser-induced THz magnetization precession for a tetragonal Heusler-like nearly compensated ferrimagnet
• Quantification of a propagating spin-wave-packet created by an ultrashort laser pulse in a thin film of magnetic metal
• Magnetization Dynamics in Synthetic Antiferromagnets with Perpendicular Magnetic Anisotropy
• Sub-picosecond exchange-relaxation in the compensated ferrimagnet Mn${}_2$Ru${}_x$Ga
• Unidirectional propagation of spin waves excited by femtosecond laser pulses in a planar waveguide
• Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system