Broadband electrical detection of spin excitations in Ga0.98Mn0.02As using a photovoltage technique
We report on microwave photovoltage and simultaneous magnetotransport measurements in a (Ga, Mn) As film oriented normal to the magnetic field. We detect the ferromagnetic resonance over a broad frequency range of 2–18.5GHz and determine the spectroscopic g-factor and separate the Gilbert from the i...
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Veröffentlicht in: | Applied physics letters 2008-06, Vol.92 (23) |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng ; jpn |
Online-Zugang: | Volltext |
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Zusammenfassung: | We report on microwave photovoltage and simultaneous magnetotransport measurements in a (Ga, Mn) As film oriented normal to the magnetic field. We detect the ferromagnetic resonance over a broad frequency range of 2–18.5GHz and determine the spectroscopic g-factor and separate the Gilbert from the inhomogeneous contribution to magnetization relaxation. Temperature dependent measurements below the saturation magnetization indicate that the photovoltage signal can serve as a sensitive tool to study the crystal anisotropy. We demonstrate that the combination of spin dynamics with charge transport is a promising tool to study microstructured ferromagnetic semiconductor samples. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.2943280 |