Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy

Abstract

Using a time-resolved magneto-optical Kerr effect (TR-MOKE) microscope, we observed ultrafast demagnetization of inverse-spinel-type NiCo2O4 (NCO) epitaxial thin films of the inverse spinel type ferrimagnet NCO with perpendicular magnetic anisotropy. This microscope uses a pump-probe method, where the sample is pumped at 1030 nm, and magnetic domain images are acquired via MOKE microscopy at 515 nm (the second harmonic). We successfully observed the dynamics of the magnetic domain of the NCO thin film via laser irradiation, and obtained a demagnetization time constant of approximately 0.4 ps. This time constant was significantly smaller than the large time constants reported for other half-metallic oxides. These results, combined with the results of our x-ray photoemission spectroscopy study, indicate that this NCO thin film is a ferrimagnetic metal whose electronic structure deviates from the theoretically predicted half-metallic one.

arXiv comment5 pages, 5 figures

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Cited by in corpus (6)

• Perspective on Epitaxial NiCo2O4 Film as an Emergent Spintronic Material: Magnetism and Transport Properties
• Optically-induced magnetization switching in NiCo2O4 thin films using ultrafast lasers
• Scattering phenomena for spin transport in Kitaev spin liquid
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• All-optical helicity-dependent switching in NiCo${}_2$O${}_4$ thin films
• Type-II-like ultrafast demagnetization behavior in NiCo2O4 thin films