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

Abstract

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.

3 pages, 2 figures, revtex4, APL

References in corpus (7)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Microwave photovoltage and photoresistance effects in ferromagnetic microstrips
• Magnetization relaxation in (Ga,Mn)As ferromagnetic semiconductors
• Perpendicular magnetization reversal, magnetic anisotropy, multi-step spin switching, and domain nucleation and expansion in Ga1-xMnxAs films
• Quantized spin excitations in a ferromagnetic microstrip from microwave photovoltage measurements
• Ferromagnetic resonance study of free hole contribution to magnetization and magnetic anisotropy in modulation-doped Ga${}_{1-x}$Mn${}_x$As/Ga${}_{1-y}$Al${}_y$As:Be
• Magnetic Anisotropy, Spin Pinning and Exchange Constants of (Ga,Mn)As films

Cited by in corpus (6)

• On the line shape of the electrically detected ferromagnetic resonance
• Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
• Rectification of radio frequency current in giant magnetoresistance spin valve
• Angle-Dependent Spin-Wave Resonance Spectroscopy of (Ga,Mn)As Films
• Broadband ferromagnetic resonance characterization of GaMnAs thin films
• Magnetization Dissipation in the Ferromagnetic Semiconductor (Ga,Mn)As