High sensitivity RF detection of domain wall resonance in magnetic garnet films

Author

Gall, H. Le ; Vukadinovic, N.

Author_Institution

Lab. de Magnetisme et d´´Optique des Solides, CNRS, Meudon-Bellevue, France

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

3051

Lastpage

3053

Abstract

A novel technique that improves both the coupling of the domain wall with the RF excitation field and the signal/noise ratio of the detected signal associated with the wall oscillations is reported. Measurements were made on full wafer garnets in a wideband resonance spectrometer with a nonresonant microstrip transmission excitation line. The problem of the standing wave ratio (SWR) change with RF frequency inherent in the reflection-type spectrometer is eliminated by using a subtraction mode of the digital oscilloscope. Large signals from normal and flexural wall modes are easily detected, and fine structures associated with magnetoelastic coupling are observed in (111)- and (110)-oriented garnet films with different magnetic parameters

Keywords

ferrimagnetic resonance; garnets; magnetic domain walls; magnetic thin films; magnetoelastic effects; RF detection; RF excitation field; digital oscilloscope; domain wall resonance; flexural wall modes; garnet films; magnetoelastic coupling; nonresonant microstrip transmission excitation line; signal/noise ratio; standing wave ratio; subtraction mode; wideband resonance spectrometer; Couplings; Magnetic domain walls; Magnetic domains; Magnetic noise; Magnetic resonance; RF signals; Radio frequency; Signal detection; Signal to noise ratio; Spectroscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92331

Filename

92331