REDUCED LEAKAGE CURRENT AND ENHANCED MAGNETIC PROPERTIES OF (Bi,Nd)FeO 3 THIN FILMS GROWN ON (Ba,Sr)TiO 3 BOTTOM LAYER (original) (raw)

Functional Materials Letters, 2012

Abstract

A multiferroic heterostructure composed of ( Bi 0.875 Nd 0.125) FeO 3 (BNF) are grown on ( Ba 0.65 Sr 0.35) TiO 3(BST) buffered Pt/Ti/SiO2/Si(100) substrate by rf-magnetron sputtering. The heterostructure BNF/BST exhibits a quite low leakage current (3.7 × 10-7 A/cm2 at 300 kV/cm) and dielectric loss (0.0036 at 100 kHz) at room temperature. The saturated magnetization and the coercive field of the BST/BNF heterostructure are 37.7 emu/cm3 and 357.6 Oe, respectively. The low leakage current owed to the action of BST in the charge transfer between BNF and the bottom electrode, the coupling reaction between BST and BNF films. And the better crystallization in BNF/BST heterostructure thin film lead to the ferromagnetic properties enhanced.

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