Flexible La0.67Sr0.33MnO3:ZnO Nanocomposite Thin Films Integrated on Mica

Abstract

The integration of functional oxide thin films on flexible substrates is critical for their application in flexible electronics. Here, to achieve flexible perovskite manganite oxide film with excellent low-field magnetoresistance (LFMR) effect, textured La0.67Sr0.33MnO3 (LSMO):ZnO nanocomposite film was deposited on a flexible mica substrate with ZnO buffer using pulsed laser deposition (PLD). Compared to the polycrystalline LSMO:ZnO nanocomposite film directly deposited on mica without buffer, the LSMO:ZnO/ZnO/mica sample exhibits larger saturation magnetization (164 emu/cm3) and higher Curie temperature (∼319 K), which results from the crystallinity and strain in the LSMO phase. In addition, the LSMO:ZnO/ZnO/mica film presents a high MR value of ∼39% at 10 K under 1 T. Furthermore, the good mechanical stretchability and property stability of the nanocomposite thin films have been demonstrated with mechanical bending.

Self-Assembled La0.67Sr0.33MnO3:CeO2 Vertically Aligned Nanocomposite Thin Films on Flexible Mica

“…Considering their potential in Si-based devices, VANs have also been integrated on Si wafers with sets of buffer layers to overcome lattice mismatch and possible interdiffusion [18][19][20]. However, due to the contradiction of the required high deposition temperature of VAN thin films and the low melting point of the flexible polymer substrates, flexible VAN has not been widely achieved, which hinders its further applications in flexible devices [21][22][23]. Recently, mica has been employed to realize flexible functional oxide thin films because of its high melting point (1300 • C) and flexible nature after being cleaved into ultrathin form.…”

“…Various epitaxial oxide thin films have been successfully demonstrated on flexible mica, such as CoFe 2 O 4 (CFO) [24], La 0.67 Sr 0.33 MnO 3 (LSMO) [25], VO 2 [26], Pb (Zr, Ti) O 3 (PZT) [27], SrRuO 3 (SRO) [28] and so forth. However, very limited attempts have been conducted to integrate VANs on mica [21][22][23], possibly due to its complicated growth mechanism with two phases being simultaneously involved during its growth.…”