Tunable room temperature magnetoelectric response of SmFeO₃/poly(vinylidene fluoride) nanocomposite films

Abstract

SmFeO3/poly(vinylidene fluoride) composite films exhibit tunable magnetoelectric effects induced by strong strain interactions at the interfaces.

Robust Piezoelectric Coefficient Recovery by Nano-Inclusions Dispersion in Un-Poled PVDF–Ni0.5Zn0.5Fe2O4 Ultra-Thin Films

“…This promoted the local dispersion of the nanoparticles as a possible way to reduce the observed piezoelectric losses due to the presence of nano-inclusions and to re-enhance coupling performances for the next generation of magnetoelectric nanostructures. It is important to stress at this point that the piezoelectric coefficient values of approximately 10 pm/V measured in our un-poled neat PVDF films were in the low range of the piezoelectric coefficient values reported in the literature (between 13 and 28 pm/V) for poled PVDF and its co-polymer [19,48,[50][51][52]. The mixing of the non-electroactive phase (α) with the electroactive one (β) was considered at the origin of an intrinsic polymer chain disorder.…”

“…This can be observed in Figure 5b in which the NF-PVDF film shows a non-detectable d 33 . The partial recovery of this d 33 coefficient can be attributed to the effect of the dispersion of the nano-inclusions by following the easy scheme reported in [52]. The application of an applied electric field gives rise to the possible mechanism of coupling between electric properties of the PVDF and the magnetic one of the nanoparticles.…”

“…The mixing of the non-electroactive phase (α) with the electroactive one (β) was considered at the origin of an intrinsic polymer chain disorder. In the case of poled films, the application of an electric field during the elaboration process, can help orient (polarized) polymer along the electric field lines and, thus, giving rise to the higher piezoelectric coefficient reported in the literature (between 13 and 28 pm/V) [19,48,[50][51][52]. In our case, the unpoled elaboration procedure as well as the presence of sub-micrometer agglomerates of metallic nanoparticles may have increased the polymer disorder and facilitated leakage of the current effect at the same time.…”

Термодинамические свойства и фазовые переходы микрокристаллической и наноструктурированной керамики SmFeO-=SUB=-3-=/SUB=-

“…Феррит самария SmFeO 3 (SFO) относится к семейству редкоземельных ортоферритов с перовскитоподобной кристаллической структурой PPnma/Pbnm, D 16 2h ) [1]. SFO обладает высоким коэффициентом магнитострикции, высокими температурами магнитного упорядочения ∼ 670 K и спин-переориентации 480 K, которые делают его потенциальным кандидатом на магнитоэлектрические приложения [2,3]. Однако возможность несобственного сегнетоэлектричества в монокристаллах SFO были спорными [3].…”

Features of thermodynamic properties of nanostructured SmFeO3 ceramics

“…Феррит самария SmFeO 3 (SFO) относится к семейству редкоземельных ортоферритов с перовскитоподобной кристаллической структурой (Pnmа/Pbnm, D 16 2h ) [1]. SFO обладает высокими температурами магнитного упорядочения (~ 670 К) и спинпереориентации (480 К), которые делают его потенциальным кандидатом на магнитоэлектрические приложения [2,3]. В последнее время исследователи особенно активно изучают этот материал, так как в нем была обнаружена несобственная сегнетоэлектрическая поляризация при T C = T N = 670 K (Ps = 100 μ C/m 2 ) [4].…”