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Microwave properties of Ni-based ferromagnetic inverse opals

Authors :
N. A. Grigoryeva
Mikhail Kostylev
A. A. Mistonov
Sergey V. Grigoriev
Dirk Menzel
Kirill S. Napolskii
N. A. Sapoletova
Alexey V. Lukashin
A. A. Eliseev
Sergey Samarin
Andrey Stashkevich
Yves Roussigné
Source :
Physical Review B. 86
Publication Year :
2012
Publisher :
American Physical Society (APS), 2012.

Abstract

Investigations of microwave properties of Ni-based inverse ferromagnetic opal-like film with the [111] axis of the fcc structure along the normal direction to the film have been carried out in the 2--18 GHz frequency band. We observed multiple spin wave resonances for the magnetic field applied perpendicular to the film, i.e., along the [111] axis of this artificial crystal. For the field applied in the film plane, a broad band of microwave absorption is observed, which does not contain a fine structure. The field ranges of the responses observed are quite different for these two magnetization directions. This suggests a collective magnetic ground state or shape anisotropy and collective microwave dynamics for this foam-like material. This result is in agreement with SQUID measurements of hysteresis loops for the material. Two different models for this collective behavior are suggested that satisfactorily explain the major experimental results.

Details

ISSN :
1550235X and 10980121
Volume :
86
Database :
OpenAIRE
Journal :
Physical Review B
Accession number :
edsair.doi...........293a18ca09494600dd8619c7d7067792
Full Text :
https://doi.org/10.1103/physrevb.86.184431