Photo-Induced Precession of Magnetization in Metal/(Ga, Mn)As Systems

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

“…Hand-in-hand with the optimization of the material synthesis, we have developed experimental capabilities based on the MO pump-and-probe method that allows us to simultaneously determine the magnetic anisotropy, Gilbert damping and spin stiffness constants from one consistent set of measured data. The possibility to excite and detect precession of ferromagnetic Mn moments in (Ga,Mn)As by this method has been extensively discussed in previous MO studies (see Methods and Supplementary Notes 6-9 for the detailed description of the method) [30][31][32][33][34][35][36][37][38][39][40][41] . All experiments presented below were performed at 15 K. The anisotropy constants, shown in Fig.…”

Spin-dependent phenomena and device concepts explored in (Ga,Mn)As

“…The technique helped to experimentally identify different mechanisms by which photo-carriers can induce magnetization dynamics in the pump-and-probe experiments in (Ga,Mn)As. The recombining photo-carriers can heat the lattice and the transient increase of temperature can trigger magnetization dynamics or, on much shorter time-scales, the photocarriers can directly induce spin torques acting on the magnetization Kobayashi et al, 2010;Nemec et al, 2012;Oiwa et al, 2005;Qi et al, 2009Qi et al, , 2007Rozkotova et al, 2008;Rozkotová et al, 2008;Takechi et al, 2007;Tesarova et al, 2012aTesarova et al, , 2013Wang et al, 2007b). These effects are reviewed in more detail in the following sections.…”

“…35 by negatively biasing an attached piezo-stressor to the (Ga,Mn)As sample which modified the magnetic anisotropy of the ferromagnetic film. At positive piezo-voltage, on the other hand, the polarization-independent mechanisms Kobayashi et al, 2010;Oiwa et al, 2005;Qi et al, 2009Qi et al, , 2007Rozkotova et al, 2008;Rozkotová et al, 2008;Takechi et al, 2007;Wang et al, 2007b) start to act along with the optical STT, as illustrated in the bottom panel of Fig. 35 (Nemec et al, 2012).…”

High Curie temperature and perpendicular magnetic anisotropy in homoepitaxial InMnAs films

“…Otherwise, the Gilbert damping coefficient can be obtained by FMR. The Gilbert damping coefficient is an important parameter for spintronics and has been determined to be in the range of 0.12-0.24 for GaMnAs [39,40].…”