Broadband electrical detection of spin excitations in Ga0.98Mn0.02As using a photovoltage technique

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)
Hauptverfasser: Wirthmann, André, Hui, Xiong, Mecking, N., Gui, Y. S., Chakraborty, T., Hu, C.-M., Reinwald, M., Schüller, C., Wegscheider, W.
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container_issue 23
container_start_page
container_title Applied physics letters
container_volume 92
creator Wirthmann, André
Hui, Xiong
Mecking, N.
Gui, Y. S.
Chakraborty, T.
Hu, C.-M.
Reinwald, M.
Schüller, C.
Wegscheider, W.
description 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.
doi_str_mv 10.1063/1.2943280
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title Broadband electrical detection of spin excitations in Ga0.98Mn0.02As using a photovoltage technique
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