利用光电压技术对（Ga，Mn）As自旋激发的宽带电学探测
Broadband electrical detection of spin excitations in (Ga,Mn)As using a photovoltage technique
摘要：
本文报道了垂直于磁场取向的（Ga，Mn）As薄膜的微波光电压和同步磁输运测量。我们检测的铁磁共振在一个广泛的频率范围为2 GHz至18.5 GHz，并确定光谱g因子和分离的吉尔伯特从非均匀的贡献磁化弛豫。饱和磁化强度以下的温度依赖性测量表明，光电压信号可以作为一个敏感的工具来研究晶体的各向异性。我们证明了自旋动力学与电荷输运的结合是研究微结构铁磁半导体样品的一个很有前途的工具。
英文摘要：
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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