Wirthmann, André and Hui, Xiong and Mecking, N. and Gui, Y. S. and Chakraborty, Tapash and Hu, C. M. and Reinwald, Matthias and Schüller, Christian and Wegscheider, Werner
Broadband electrical detection of spin excitations in Ga0.98Mn0.02As using a photovoltage technique.
Applied Physics Letters 92 (23), p. 232106.
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 2–18.5 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.
|Date:||11 June 2008|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|75.70.Ak; 73.50.Pz; 73.50.Jt; 75.40.Gb; 76.50.+g; 75.50.Dd; ||PACS|
|Keywords:||crystal microstructure, ferromagnetic materials, ferromagnetic resonance, gallium compounds, galvanomagnetic effects, g-factor, magnetic thin films, magnetisation, manganese compounds, photovoltaic effects, semiconductor thin films, spin dynamics|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||25 Jan 2010 14:00|
|Last Modified:||20 Jul 2011 22:18|