Evidence of long-wavelength collective excitations in magnetic superlattices

We report on a mechanism of dynamic dipolar coupling in magnetic superlattices via long-wavelength nonevanescent fields. In the spin excitation spectra of our heterophase stripe structures, such interactions mediate a singlet<-->doublet crossover in the frequency regime driven by the orientati...

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Bibliographic Details
Published inPhysical review letters Vol. 97; no. 25; p. 256401
Main Authors Polushkin, Nikolay I, Michalski, Steven A, Yue, Lanping, Kirby, Roger D
Format Journal Article
LanguageEnglish
Published United States 22.12.2006
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Summary:We report on a mechanism of dynamic dipolar coupling in magnetic superlattices via long-wavelength nonevanescent fields. In the spin excitation spectra of our heterophase stripe structures, such interactions mediate a singlet<-->doublet crossover in the frequency regime driven by the orientation of an external static field. This crossover is a new feature observed in collective behavior of superlattices, though there is some analogy of this phenomenon with birefringence taking place in optical superlattices. We envision applying the collective effects described here in microwave photonic devices.
ISSN:0031-9007
DOI:10.1103/physrevlett.97.256401