Sputter-prepared (001) BiFeO3 thin films with ferromagnetic L10-FePt(001) electrode on glass substrates

Abstract

Highly textured BiFeO3(001) films were formed on L10-FePt(001) bottom electrodes on glass substrates by sputtering at reduced temperature of 400°C. Good electric polarization 2Pr = 80 and 95 μC/cm2, comparable to that of the reported epitaxial films, and coercivity Ec = 415 and 435 kV/cm are achieved in the samples with 20-nm- and 30-nm-thick electrodes. The BiFeO3(001) films show different degrees of compressive strain. The relation between the variations of strain and 2Pr suggests that the enhancement of 2Pr resulted from the strain-induced rotation of spontaneous polarization. The presented results open possibilities for the applications based on electric-magnetic interactions.

Multiferroic properties of (Bi, Ca)FeO 3 films on glass substrates

“…Different from ceramics, ferroelectric properties are sensitive to the surface or interface structure of electrode [25][26][27][28][29][30][31][32]. In our previous studies, the refined metal bottom electrodes on glass substrates is helpful in lowering the formation temperature of perovskite phase of BFO and attaining flat dense microstructure and interface, which leads to good ferroelectric properties [25][26][27][28][29][30][31][32]. In this study, we report on Bi 1−x Ca x FeO 3 films with x = 0.05, 0.1, and 0.15 grown on refined metallic Pt(1 1 1) electrode layer buffered glass substrate by pulsed laser deposition (PLD) at reduced temperature of 450 • C. Structural, ferroelectric, and magnetic characterizations of BCFO films are presented.…”

Photovoltaic Property of Multiferroic ${\hbox{BiFeO}}_3$ Films With Different Textures on Glass Substrates

“…M ULTIFERROIC (MF) materials, in which ferroelectric (FE) and ferromagnetic (FM) behaviors coexist and these two orderings may couple to each other, have drawn much attention due to their interesting physics and immense potential for new multifunctional applications [1]- [13]. Perovskite bismuth ferrite BiFeO (BFO) is the most studied MF and a potentially important lead-free FE material because of its high transition temperatures (well above room temperature) including FE Curie temperature ( C ) of 830 C and antiferromagnetic Neel temperature ( ) of C [1]- [13].…”

“…Perovskite bismuth ferrite BiFeO (BFO) is the most studied MF and a potentially important lead-free FE material because of its high transition temperatures (well above room temperature) including FE Curie temperature ( C ) of 830 C and antiferromagnetic Neel temperature ( ) of C [1]- [13]. Epitaxial BFO thin films display spontaneous electrical polarization an order of magnitude higher than that in bulk form [5].…”

“…Accordingly, comprehensive studies have been made on the BFO films grown on single crystal substrates, including SrTiO (100), SrTiO (110) SrTiO (111), MgO(100), TbScO (110), DyScO (110), and Si(100) etc., on various aspects [5]- [11]. Additionally, the sputter-prepared BFO films also considered interests due to the outstanding FE properties [9], [13], [14].…”

“…On the other hand, of all single crystal oxide substrates which BFO films were grown on, the expensive cost of the substrates and very high formation temperature ( ) of perovskite phase close to 700 C lead to difficulties in practical production [5]- [11]. From previous studies, the introduction of a suitable underlayer like Pt or FePt can significantly reduce by about 200 C [11]- [13], [21]. Although BFO films grown on various substrates have been studied, reports on using a glass substrate, one of the most widely used substrate in industry, are still few.…”