In this work, we reported the fabrication and magnetoelectric coupling properties of the multiferroic CoFe 2 O 4-PbZr 0.2 Ti 0.8 O 3 (CFO-PZT) coaxial nanofibers synthesized by electrospinning technique. The coaxial structure of nanofibers was demonstrated by magnetic force microscope and transmission electron microscope. The multiferroic properties of coaxial nanofibers have been revealed by magnetic hysteresis loops and piezoresponse amplitude butterfly curves and phase hysteresis loops. The as-prepared coaxial nanofibers show an effective piezoelectric coefficient d 33 of 30 pm/V and a saturated magnetization of 12 emu/g. Their magnetoelectric response has been probed by means of the localized changes in magnetization after poling the domains of the composite system. A static, large converse magnetoelectric coupling coefficient of 1.2 × 10 −8 s/m was obtained in a single CFO-PZT nanofiber.
Recent progress in organic electronics has attracted interest due to their excellent characteristics that include photovoltaics, light emission and semiconducting behaviour. Spin induced properties play important roles in organic electronics...
A systematic comparative study of the electronic transport and ferromagnetic resonance of ultrathin trilayers (TLs) of SrRuO3/LaNiO3/ La0.7Sr0.3MnO3 on (001)-and (111)-oriented SrTiO3 (STO) substrates has been reported. An unusual upturn in resistivity ρ(T) at low-temperature (so called Kondo-like behaviour) accompanied by the negative magneto-resistance has been observed. For temperatures larger than the Kondo temperature (TK), ρ(T) is in good agreement with the Hamann's impurity resistivity model ρ(T >TK) ∝ (ln(T /TK)) −2 for spin S=1/2 and 3/2 for the TLs on (001)-STO and (111)-STO, respectively. At the temperatures T ≫ TK, electron-electron (ρ(T)∝ T 2) contribution dominates over those appearing due to the electron-phonon interaction (ρ(T)∝ T 5) and 2-Magnon scattering. Using the ferromagnetic resonance near the Curie temperature of La0.7Sr0.3MnO3, we evaluated the contribution of surface anisotropies (Ks) as well as in-plane volume anisotropies (Kν) : Ks ∼ −9.57 × 10 −4 J/m 2 (-6.68 ×10 −4 J/m 2) and Kν ∼ 4.04 × 10 5 J/m 3 (3.31×10 5 J/m 3) for the TLs on (001)-STO (TLs on (111)-STO). In addition, the Gilbert damping constant is determined which varies between 0.32 (0.23) and 0.16 (0.19) having spin mixing conductance, g ↑↓ = 5.2×10 19 m −2 (13.38×10 19 m −2) for TLs on (001)-STO ((111)-STO).
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