Local Excitation of Magnetostatic Modes in YIG

Author

Papa, E. ; Barnes, S.E. ; Ansermet, J-Ph

Author_Institution

IPMC, Ecole Polytech. Fed. de Lausanne, Lausanne, Switzerland

Volume

49

Issue

3

fYear

2013

fDate

Mar-13

Firstpage

1055

Lastpage

1059

Abstract

Described are ferromagnetic resonance (FMR) studies of the long wavelength magnetostatic wave modes of a single crystal yttrium iron garnet (YIG) slab magnetized by an in-plane field. A resonant circuit comprising a coil, 50 μm in diameter, is used to excite and detect the YIG microwave absorption spectrum. By changing its orientation and position over the sample surface it is possible to excite selectively different series of magnetostatic modes. The observed resonance fields are in good agreement with those calculated numerically from the Damon-Eshbach dispersion relation. The effect of heat currents on the magnetization dynamics in insulating magnets is explored. For a YIG crystal 10 mm in length, 2 mm in width and 25 micrometers in thickness, a temperature gradient of about 20 K/cm is sufficient to suppress the high-order longitudinal magnetostatic modes.

Keywords

coils; ferromagnetic resonance; garnets; magnetisation; magnetostatic waves; microwave spectra; yttrium compounds; Damon-Eshbach dispersion relation; Y₃Fe₂(FeO₄)₃; YIG microwave absorption spectrum; ferromagnetic resonance; heat currents; in-plane ήeld; insulating magnets; local excitation; long wavelength magnetostatic wave modes; radius 25 mum; resonant circuit; single crystal yttrium iron garnet slab; size 10 mm; size 2 mm; temperature gradient; Magnetic resonance; Magnetic resonance imaging; Magnetostatic waves; Magnetostatics; Probes; Saturation magnetization; Temperature measurement; Ferromagnetic resonance (FMR); magnetostatic modes; spin caloritronics; yttrium iron garnet (YIG);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2229386

Filename

6466525