Figures

Figure 1

Time dependent anisotropy observed for ¹⁸¹Hf in Wurtzite GaN after implantation and RTA annealing for 120 s at temperatures indicated in the frames. The <0001> axis was aligned with the angle bisector between two detectors under 90°. The solid lines represent least squares fits to the data.

Figure 2

(a) Fraction of ¹⁸¹Hf probes in GaN showing the unique quadrupole interaction of _Q1 = 338 MHz (open squares) after various steps of isochronal annealing programmes and the fraction associated with a defect (open triangles). (b) Width of the frequency distribution around _Q1 (open squares) and _Q2 (open triangles).

Figure 3

Time dependent anisotropy observed for ¹⁸¹Hf in Wurtzite GaN after annealing for different orientations of the <0001> axis. a) aligned with the angle bisector between two detectors under 90°, b) perpendicular to the detector plane, c) aligned with one detector axis. The solid lines represent least squares fits to the data.

Figure 4

Time dependent anisotropy observed for ¹⁸¹Hf in Wurtzite InN (for details see figure 1)

Figure 5

(a) Fraction f_D of ¹⁸¹Hf probes in InN showing the unique quadrupole interaction of _Q = 666 MHz after various steps of an isochronal annealing programme, (b) Width of the frequency distribution around _Q.

Figure 6

Time dependent anisotropy observed for ¹⁸¹Hf in Wurtzite AlN (for details see figure 1)

Figure 7

(a) Fraction f_D of ¹⁸¹Hf probes in AlN showing the unique quadrupole interaction of _Q = 323 MHz after various steps of an isochronal annealing programme, (b) Width of the frequency distribution around _Q.

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