Hartman effect for spin waves in exchange regime

Hartman effect for spin waves tunnelling through a barrier in a thin magnetic film is considered theoretically. The barrier is assumed to be created by a locally increased magnetic anisotropy field. The considerations are focused on a nanoscale system operating in the exchange-dominated regime. We d...

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Bibliographic Details
Published in:arXiv.org 2018-07
Main Authors: Klos, Jaroslaw W, Dadoenkova, Yulia S, Rychly, Justyna, Dadoenkova, Nataliya N, Lyubchanskii, Igor L, Barnas, Jozef
Format: Article
Language:English
Subjects:
Electronic systems
Exchanging
Group delay
Magnetic anisotropy
Magnetic films
Magnons
Photonics
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Summary:Hartman effect for spin waves tunnelling through a barrier in a thin magnetic film is considered theoretically. The barrier is assumed to be created by a locally increased magnetic anisotropy field. The considerations are focused on a nanoscale system operating in the exchange-dominated regime. We derive the formula for group delay \(\tau_{gr}\) of spin wave package and show that \(\tau_{gr}\) saturates with increasing barrier width, which is a signature of the Hartman effect predicted earlier for photonic and electronic systems. In our calculations we consider the general boundary exchange conditions which take into account different strength of exchange coupling between the barrier and its surrounding. As a system suitable for experimental observation of the Hartman effect we propose a CoFeB layer with perpendicular magnetic anisotropy induced by a MgO overlayer.
ISSN:2331-8422