Figure 1

(a) ${\mathrm{Ga}}_{0.98}{\mathrm{Mn}}_{0.02}\mathrm{As}$ sample orientation with respect to the applied magnetic field and the four-step magnetization reversal process as consecutive 90° jumps (shown by dotted arrows) between the four easy directions (1)–(4). (b) Field dependencies of the magnetic linear dichroism for different angles $\theta$ between the incident polarization and the [100] crystallographic direction, measured at a wavelength of $\lambda =815\mathrm{nm}$. Numbers (1) to (4) correspond to the magnetization directions indicated in (a). ${\mathrm{H}}_{12}$ and ${\mathrm{H}}_{23}$ are the magnetic field values required for making jumps $(1)\to (2)$ and $(2)\to (3)$, respectively. (c) Spectra of polar magneto-optical Kerr effect and magnetic linear dichroism (at $\theta =135°$); (d) absorption spectrum. Note that in panels (c) and (d) Fabry-Perot oscillations in the signal due to the finite buffer thickness have been removed numerically using a bandpass filter.Reuse & Permissions

Figure 2

(a) The amplitude ${\alpha }_{\max }$ of the linear magnetic dichroism as a function of the angles between the incident polarization and the [100] crystallographic direction in $(\mathrm{Ga},\mathrm{Mn})\mathrm{As}$. (b) Coercivity $\Delta \mathrm{H}$ and ${\alpha }_{\max }$ of the M-shaped hysteresis loop as a function of temperature, for an orientation of the incoming polarization of 135°. Lines are guides to the eye.Reuse & Permissions