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(a) Magnetic hysteresis loops measured by SQUID magnetometry at T = 150 K for annealed (Ga0.88,Mn0.12)As with the external magnetic field B applied along the [1–10] (closed squares) and  (open circles) directions. The solid line is the result of the fitting to the  loop using the Stoner-Wohlfarth model. (b) Definition of the angles used.
Normalized transverse resistance Rxy /ΔR measured at T = 150 K as a function of the external magnetic field B applied at different in-plane angles ϑ for (a) VP = +85 V and (b) VP = −70 V. (c) Magnetic hysteresis loops measured by SQUID magnetometry at T = 150 K with B applied along the [1–10] direction and corresponding fittings. The insets in (a), (b), and (c) show the easy axis direction for each applied piezo-voltage VP .
Dependence of the piezo-induced uniaxial magnetic anisotropy constant KUp on strain Δε at T = 150 K as derived from magneto-transport (closed squares) and SQUID magnetometry (open circles) experiments. The corresponding linear fits are shown by the dashed lines.
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