We investigate the spin dynamics of a NiFe/SiN/GaAs nanohybrid structure, in which the volume of NiFe is significantly reduced by ion milling. The photogenerated GaAs electron spins induce the electron Larmor precession with a long decay component (LDC) with a time constant τLDC of 550 ps under zero field at room temperature, indicating the presence of an effective magnetic field. The LDC reflects the relaxation of NiFe magnetization, whose time constant is modulated by the inner product of NiFe magnetization and GaAs electron spins in the external field. These results indicate the existence of an exchange interaction between the NiFe magnetization and GaAs electron spins.
ASJC Scopus subject areas
- Physics and Astronomy(all)