resumo
Lead free magneto electrics with a strong sub resonant (broad frequency range) magneto electric coupling coefficient (MECC) is the goal of the day which can revolutionise the microelectronics and microelectromechanical systems (MEMS) industry. We report giant resonant MECC in lead free nanograined Barium Titanate-CoFe (Alloy)-Barium Titanate [BTO-CoFe-BTO] sandwiched thin films. The resonant MECC values obtained here are the highest values recorded in thin films/multilayers. Sub-resonant MECC values are quite comparable to the highest MECC reported in 2-2 layered structures. MECC got enhanced by two orders at a low frequency resonance. The results show the potential of these thin films for transducer, magnetic field assisted energy harvesters, switching devices, and storage applications. Some possible device integration techniques are also discussed. (C) 2013 AIP Publishing LLC.
palavras-chave
MAGNETOELECTRIC LAMINATE COMPOSITES; THIN-FILMS; FERROELECTRICITY; MAGNETOSTRICTION; TRANSVERSE; MECHANISM; GROWTH
categoria
Physics
autores
Nair, SS; Pookat, G; Saravanan, V; Anantharaman, MR
nossos autores
Venket
Bolseiro de pós-DoutoramentoGrupos
agradecimentos
S.S.N. and K.V.S. acknowledge FCT, Portugal for their respective financial grants SFRH/BPD/42136/2007 and SFRH/BPD/80742/2011. The work has been supported partially by the MULTICERAL project (No. NMP3-CT-2006-032616). S.S.N. also acknowledges Professor Nikolai A. Sobolev and Andrei L. Kholkin, CICECO, Universidade de Aveiro, for extending necessary infrastructure and laboratory facilities. The team also acknowledges Professor Gleb Kakazei, Universidade do Porto, for magnetic measurements (SQUID). G.P. acknowledges UGC, India, for providing financial assistance in the form of RFSMS fellowship (No. F4-3/2006(BSR)/8-3/2007(BSR)). M.R.A. acknowledges DAE-BRNS for funding provided in the form of a project (No: 2011/34/7/BRNS/0596).