Photothermal investigation of magnetostatic modes in yttrium iron garnet at high microwave power levels

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/20.104415· OSTI ID:5963126

von Geisau, O; Pelzl, J ^[1]; Netzelmann, U ^[2]; Rezende, S M ^[3]

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1. Inst. fur Experimentalphysik AG VI, Ruhr-Univ., D-4630 Bochum (DE)
2. Fraunhofer-Inst., IZFP, D-6600 Saarbrucken (DE)
3. Dept. de Fisica, Univ. Federal de Pernambuco, Recife (BR)

Laterally resolved magnetostatic mode spectra in an yttrium iron garnet single-crystal (0.98 {center dot} 8.40 {center dot} 4.40 mm{sup 3}) are obtained by microwave spectroscopy using the photothermal laser beam deflection technique. For a microwave frequency of 9.33 GHz and a power of 2.2 W both magnetostatic surface and magnetostatic backward volume wave modes are observed. The lateral variation of these modes can be explained by a modified WKB approximation for the magnetostatic potential and by taking into account the presence of an inhomogeneous demagnetization field inside the sample. At high incident microwave power a foldover effect in the range of the surface wave modes and one distinctly larger volume wave mode peak occur. The photothermal signal phase provides information on the penetration depth of the surface wave modes.

• OSTI ID: 5963126
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA), Vol. 26:5; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
GARNETS
PENETRATION DEPTH
BEAM OPTICS
BEAM-PLASMA SYSTEMS
IRON OXIDES
LASERS
MAGNETIC PROPERTIES
MICROWAVE SPECTRA
MONOCRYSTALS
WKB APPROXIMATION
YTTRIUM OXIDES
CHALCOGENIDES
CRYSTALS
IRON COMPOUNDS
MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILICATES
SILICON COMPOUNDS
SPECTRA
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
656003 - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)