Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

URN to cite this document:

urn:nbn:de:bvb:355-epub-149199 Copy

Belmeguenai, M. ; Martin, T. ; Woltersdorf, Georg ; Bayreuther, Günther ; Baltz, V. ; Suszka, A. K. ; Hickey, B. J.

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Date of publication of this fulltext: 26 May 2010 11:59

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Details

Item type:	Article
Journal or Publication Title:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics
Volume:	20
Number of Issue or Book Chapter:	34
Page Range:	p. 5206
Date:	August 2008
Institutions:	Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Günther Bayreuther
Identification Number:	Value Type 10.1088/0953-8984/20/34/345206 DOI
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Yes
Item ID:	14919

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Abstract

Vector network analyzer ferromagnetic resonance spectroscopy (VNA-FMR) is used here to study the different excited modes of sputtered asymmetrical NiFe(13.6 nm)/Ru(d(Ru))/NiFe(27.2 nm) exchange-coupled films with variable Ru thicknesses. The obtained results have been compared to those of the symmetrical NiFe( 30 nm)/Ru( dRu)/NiFe( 30 nm). In both cases, the measurements show the ...

Abstract

Vector network analyzer ferromagnetic resonance spectroscopy (VNA-FMR) is used here to study the different excited modes of sputtered
asymmetrical NiFe(13.6 nm)/Ru(d(Ru))/NiFe(27.2 nm) exchange-coupled
films with variable Ru thicknesses. The obtained results have been
compared to those of the symmetrical NiFe( 30 nm)/Ru( dRu)/NiFe( 30
nm). In both cases, the measurements show the existence of an optic and
an acoustic precessional mode. The optic mode was only observed over
limited field ranges, especially in the symmetrical trilayers. To
overcome such a limitation, we developed a new technique similar to the
longitudinal FMR, where the bias and the rf field are parallel to each
other and perpendicular to the pinning field. Interestingly, and in
contrast to the symmetrical trilayers, we observed a mode anti-crossing
in the dispersion relation of the asymmetrical layers that we
attributed to the thickness difference between the two NiFe layers. Our
experimental results on the effect of the biquadratic coupling on the
mode frequency variations are in good agreement with the theory.

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Metadata last modified: 03 Jun 2018 16:24

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