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

• 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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Damping

Film thickness

Gallium alloys

Pulsed laser deposition

Yttrium

Yttrium alloys

Yttrium compounds

Damping coefficients

Gadolinium gallium garnets

Magnetodynamics

Room temperature

Temperature dependent

Temperature increase

Yttrium iron garnet films

Yttrium iron garnets

SPIN-LATTICE-RELAXATION

FERROMAGNETIC RELAXATION

FERRIMAGNETIC

RESONANCE

Physics

Applied

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