Study of the physical properties of BiFeO3 films obtained by RF sputtering using a homemade target Julio Cesar Leal-Zayas; Ramón Álvaro Vargas-Ortiz; Jorge Luis Almaral-Sánchez; Jose Miguel Mendivil-Escalante; Roberto Silva-González; Karla Mariela Moya-Canul; Jesús Iván Peña-Flores; José Martín Yáñez-Limón;