Resonances in ferromagnetic gratings detected by microwave photoconductivity

We investigate the impact of microwave excited spin excitations on the dc charge transport in a ferromagnetic (FM) grating. We observe both resonant and nonresonant microwave photoresistance, which are caused, respectively, by spin and charge dissipations of the microwave power into the FM. A macros...

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Bibliographic Details
Published in:Physical review letters 2005-07, Vol.95 (5), p.056807.1-056807.4, Article 056807
Main Authors: GUI, Y. S, HOLLAND, S, MECKING, N, HU, C.-M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances
spin-wave resonance
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Physics
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Summary:We investigate the impact of microwave excited spin excitations on the dc charge transport in a ferromagnetic (FM) grating. We observe both resonant and nonresonant microwave photoresistance, which are caused, respectively, by spin and charge dissipations of the microwave power into the FM. A macroscopic model based on Maxwell and Landau-Lifschitz equations reveals the mixing of spin and charge dissipations, which shows that the ferromagnetic anti-resonance is shifted when the conductivity is anisotropic. We find that the microwave photoconductivity provides a powerful new tool to study the interplay between photonic, spintronic, and charge effects in FM microstructures.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.056807