title: Evidence of long-wavelength collective excitations in magnetic superlattices.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0111, USA.
authors.forename: Nikolay I
authors.initials: NI
authors.lastname: Polushkin
authors.forename: Steven A
authors.initials: SA
authors.lastname: Michalski
authors.forename: Lanping
authors.initials: L
authors.lastname: Yue
authors.forename: Roger D
authors.initials: RD
authors.lastname: Kirby