Thickness- and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4914363· OSTI ID:22410055

Ranjbar, M.; Balinsky, M.; Dumas, R. K. ^[1]; Khartsev, S. ^[2]; Åkerman, J. ^[1]

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1. Department of Physics, University of Gothenburg, 41296 Gothenburg (Sweden)
2. Department of Integrated Devices and Circuits, School of ICT, Royal Institute of Technology (KTH), 16440 Kista (Sweden)

The magnetodynamical properties of nanometer-thick yttrium iron garnet films are studied using ferromagnetic resonance as a function of temperature. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition. First, we found that the damping coefficient increases as the temperature increases for different film thicknesses. Second, we found two different dependencies of the damping on film thickness: at room temperature, the damping coefficient increases as the film thickness decreases, while at T = 8 K, we find the damping to depend only weakly on the thickness. We attribute this behavior to an enhancement of the relaxation of the magnetization by impurities or defects at the surfaces.

• OSTI ID: 22410055
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DAMPING
ENERGY BEAM DEPOSITION
FERRITE GARNETS
FERROMAGNETIC RESONANCE
GADOLINIUM COMPOUNDS
GALLIUM OXIDES
LASER RADIATION
MAGNETIZATION
PULSED IRRADIATION
RELAXATION
SUBSTRATES
SURFACES
TEMPERATURE DEPENDENCE
THICKNESS
THIN FILMS
YTTRIUM