author = "Righetti, V. A. N. and Gratens, X. and Chitta, V. A. and Godoy, M. 
                         P. F. de and Rodrigues, A. D. and Abramof, Eduardo and Dias, J. F. 
                         and Schikora, D. and As, D. J. and Lischka, K.",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Universidade de S{\~a}o Paulo (USP)} 
                         and {Universidade Federal de S{\~a}o Carlos (UFSCar)} and 
                         {Universidade Federal de S{\~a}o Carlos (UFSCar)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal 
                         do Rio Grande do Sul (UFRGS)} and {Universitat Paderborn} and 
                         {Universitat Paderborn} and {Universitat Paderborn}",
                title = "Magnetic and structural properties of Fe-implanted cubic GaN",
              journal = "Journal of Applied Physics",
                 year = "2016",
               volume = "120",
               number = "10",
                pages = "103901",
                month = "Sept.",
             abstract = "In this article, we report on structural and magnetic properties 
                         of cubic GaN epitaxial layers implanted with Fe ions and 
                         subsequently subjected to thermal annealing. The epitaxial quality 
                         of the layers was studied by X-ray diffraction rocking curves 
                         (omega-scans) and Raman spectroscopy. The results show that the 
                         implantation damages the crystal structure producing an expansion 
                         of the lattice parameter in the implanted region. These damages 
                         are partially removed by the thermal treatment. Room temperature 
                         ferromagnetism is observed for the sample implanted with a dose of 
                         1.2 x 10(16) cm(-2), while samples implanted with 2.4 x 10(16) 
                         cm(-2) show a coexistence of ferromagnetism and paramagnetism due 
                         to disperse Fe3+. Thermal annealing changes these magnetic 
                         properties. For the low dose sample, the ferromagnetism is 
                         converted into paramagnetism while for the high dose we observed 
                         an enhancement of the ferromagnetic contribution characterized by 
                         a super-paramagnetism behavior attributed to Fe-based particles.",
                  doi = "10.1063/1.4962275",
                  url = "http://dx.doi.org/10.1063/1.4962275",
                 issn = "0021-8979",
             language = "en",
           targetfile = "Righetti.pdf",
        urlaccessdate = "24 jan. 2021"