The Properties and Structure Relationship of Half Metallic Magnetic Materials on GaAs

We report the magnetic and transport properties of two promising half metallic/GaAs hybrid spintronic structures with respect to their structural features. The Co₂ MnGa/GaAs(100) has shown a very low magnetic moment which is attributed to the columnar structure and the interface amorphous layer as from the HRTEM images. The out of plane hysteresis loops have shown a double switching which is related to the interface layer with different magnetic properties. In the Fe₃O₄/GaAs(100) system, the fast saturation of the magnetization indicates the low antiphase boundaries, which is supported by the HRTEM image. Furthermore, the moderate barrier height and the heavily damped processional response to the applied field pulses may be related to the interface structure.