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 (ω-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 × 1016 cm−2, while samples implanted with 2.4 × 1016 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 superparamagnetism behavior attributed to Fe-based particles.
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14 September 2016
Research Article|
September 09 2016
Magnetic and structural properties of Fe-implanted cubic GaN
V. A. N. Righetti;
V. A. N. Righetti
1Instituto de Física,
Universidade de São Paulo
, 05315-970 São Paulo, Brazil
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X. Gratens;
X. Gratens
1Instituto de Física,
Universidade de São Paulo
, 05315-970 São Paulo, Brazil
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V. A. Chitta;
V. A. Chitta
1Instituto de Física,
Universidade de São Paulo
, 05315-970 São Paulo, Brazil
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M. P. F. de Godoy
;
M. P. F. de Godoy
2Departamento de Física,
Universidade Federal de São Carlos
, 13565-905 São Carlos, Brazil
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A. D. Rodrigues
;
A. D. Rodrigues
2Departamento de Física,
Universidade Federal de São Carlos
, 13565-905 São Carlos, Brazil
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E. Abramof;
E. Abramof
3LAS,
Instituto Nacional de Pesquisas Espaciais
, 12245-970 São Jose dos Campos, Brazil
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J. F. Dias;
J. F. Dias
4Instituto de Física,
Universidade Federal do Rio Grande do Sul
, 91501-970 Porto Alegre, Brazil
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D. Schikora;
D. Schikora
5
Universität Paderborn
, 133098 Paderborn, Germany
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D. J. As;
D. J. As
5
Universität Paderborn
, 133098 Paderborn, Germany
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K. Lischka
K. Lischka
5
Universität Paderborn
, 133098 Paderborn, Germany
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J. Appl. Phys. 120, 103901 (2016)
Article history
Received:
June 23 2016
Accepted:
August 24 2016
Citation
V. A. N. Righetti, X. Gratens, V. A. Chitta, M. P. F. de Godoy, A. D. Rodrigues, E. Abramof, J. F. Dias, D. Schikora, D. J. As, K. Lischka; Magnetic and structural properties of Fe-implanted cubic GaN. J. Appl. Phys. 14 September 2016; 120 (10): 103901. https://doi.org/10.1063/1.4962275
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