Enhancement of intrinsic magnetic damping in defect-free epitaxial Fe3O4 thin films

Abstract

We have investigated the magnetic damping of precessional spin dynamics in defect-controlled epitaxial grown Fe${}_3$O${}_4$(111)/Yttria-stabilized Zirconia (YSZ) nanoscale films by all-optical pump-probe measurements. The intrinsic damping constant of the defect-free Fe${}_3$O${}_4$ film is found to be strikingly larger than that of the as-grown Fe${}_3$O${}_4$ film with structural defects. We demonstrate that the population of the first-order perpendicular standing spin wave (PSSW) mode, which is exclusively observed in the defect-free film under sufficiently high external magnetic fields, leads to the enhancement of the magnetic damping of the uniform precession (Kittel) mode. We propose a physical picture in which the PSSW mode acts as an additional channel for the extra energy dissipation of the Kittel mode. The energy transfer from Kittel mode to PSSW mode increases as in-plane magnetization precession becomes more uniform, resulting in the unique intrinsic magnetic damping enhancement in the defect-free Fe${}_3$O${}_4$ film.

arXiv comment5 pages, 4 figures

References in corpus (11)

• Dynamic approach for micromagnetics close to the Curie temperature
• Intrinsic and non-local Gilbert damping in polycrystalline nickel studied by Ti:Sapphire laser fs spectroscopy
• Scaling of intrinsic Gilbert damping with spin-orbital coupling strength
• Effective anisotropies and energy barriers of magnetic nanoparticles with Neel surface anisotropy
• Tunable Magnonic Frequency and Damping in [Co/Pd]8 Multilayers with Variable Co Layer Thickness
• Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures
• Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As
• Unusual spin-wave population in nickel after femtosecond laser pulse excitation
• Excitation of magnon accumulation by laser clocking as a source of long-range spin waves in transparent magnetic films
• Roles of heating and helicity in ultrafast all-optical magnetization switching in TbFeCo
• Magnetic Domain Wall Engineering in a Nanoscale Permalloy Junction

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