1. CINVESTAV- IPN,Departamento de Ingeniería Eléctrica (SEES),Mexico City,Mexico,C.P. 07360
2. Universidad Nacional Autónoma de México,Instituto de Física,Mexico City,Mexico,04510
3. UPIITA-Instituto Politécnico Nacional,Dept. Advanced Technologies,Mexico City,Mexico,C.P. 07360
4. CINVESTAV- IPN,Programa de Nanociencias y Nanotecnología,Mexico City,07360
5. Texas A&M University,Mike Walker ‘66 Department of Mechanical Engineering,13 College Station,TX,USA,77843