[1] Univ Santiago de Compostela, Inst Technol Invest, Magnetism & Nanotechnol Lab, E-15782 Santiago De Compostela, Spain
[2] Univ Santiago de Compostela, Dept Phys Chem, Fac Chem, E-15782 Santiago De Compostela, Spain
[3] Univ Santiago de Compostela, Dept Appl Phys, Fac Phys, E-15782 Santiago De Compostela, Spain