Broadband electrical detection of spin excitations in (Ga,Mn)As using a photovoltage technique

Details Broadband electrical detection of spin excitations in (Ga,Mn)As using a photovoltage technique Broadband electrical detection of spin excitations in (Ga,Mn)As using a photovoltage technique

2008-06-04

arxiv.org/abs/0806.0785v1

APL 92 232106 (2008)

Physics

Condensed Matter

Materials Science

3 pages, 2 figures, revtex4, APL

Scientific paper

10.1063/1.2943280

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 GHz to 18.5 GHz 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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