Study of the magnetic properties on Mn and As co-implanted GaAs.

DE BIASI EMILIO; PUDENZI MARCIO; BEHARC M.; CARVASAND F.; KNOBEL MARCELO

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ELSEVIER SCIENCE BV

Año: 2008 vol. 320 p. 404 - 407

0304-8853

The interest on diluted magnetic semiconductor (DMS), like GaMnAs, has increased during the last years due to potential applications, mainly on spintronic device. The magnetic anisotropy and the interacting effects between the magnetic nanostructures are fundamental topics to be studied. In this work we present some results on Mn and As co-implanted GaAs. Samples with three different implantation energies of Mn were prepared, keeping the As implantation energy fixed and the Mn and As dose of 21016 cm2. Annealing was done using rapid thermal annealing (RTA) at 750 1C for 20 and 50 s. Using a superconducting quantum interference device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems. device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems. Annealing was done using rapid thermal annealing (RTA) at 750 1C for 20 and 50 s. Using a superconducting quantum interference device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems. device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems. 16 cm2. Annealing was done using rapid thermal annealing (RTA) at 750 1C for 20 and 50 s. Using a superconducting quantum interference device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems. device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems. 1C for 20 and 50 s. Using a superconducting quantum interference device (SQUID) and magnetic anisotropy values reported in the literature, we have obtained information about nanocluster size distribution. Our studies indicated that the nanocluster size distribution depends on the implantation parameters and the annealing time. Differently from previous studies reported in similar samples, we have observed room-temperature hysteresis in all samples, with coercive field values typical of nanoparticle systems.