Y. Bai

Giant magnetoelectric effect in Ni–lead zirconium titanate cylindrical structure

The magnetoelectric (ME) coupling of a bilayered Ni–lead zirconate titanate composite structure synthesized by electrodeposition was studied in this paper. The ME voltage coefficient was measured in the range of 1–120kHz as the bias field is parallel to the axial. The results indicate that an electromechanical resonance appears at 59.9kHz. The bilayered cylindrical ME composite exhibits a special field dependence of ME coefficient. Either for the resonant state or the nonresonant state, above 1kOe, the ME voltage coefficient increased linearly with the strengthening of bias field, up to 30V∕cmOe at 8kOe.

Ni–PZT–Ni trilayered magnetoelectric composites synthesized by electro-deposition

We reported the high strength of magnetoelectric (ME) coupling of trilayered composites prepared by electro-deposition. The ME coupling of Ni–lead zirconate titanate–Ni trilayered structure was measured in the range of 1–120 kHz. The trilayered composites exhibit high ME voltage coefficient because of good interfacial bonding between piezoelectric and magnetostrictive layers. The peak value of the ME voltage coefficient can be up to 33 V cm−1 Oe−1 at the electromechanical resonance frequency. This magnetoelectric effect shows promise for application in transducers for magnetoelectric energy conversion.

Magnetoelectric effect in a Ni–PZT–Ni cylindrical layered composite synthesized by electro-deposition

Magnetoelectric (ME) coupling of a cylindrical trilayered composite was studied in this paper. A Ni?lead zirconate titanate (PZT)-Ni trilayered cylindrical composite was synthesized by electro-deposition. The maximum ME voltage coefficient of the cylindrical ME composite is 35?V?cm?1?Oe?1, about three times higher than that of the plate trilayered composite with the same raw materials and magnetostrictive?piezoelectric phase thickness ratio. The high ME voltage coefficient of the cylindrical composite is due to the self-bound effect of the circle. Moreover, the resulting complex condition can induce a double peak in the field dependence of the ME coefficient.

Effects of annealing on self-organized InAs quantum islands on GaAs(100)

Self-organized InAs islands on (001) GaAs grown by molecular beam epitaxy were annealed and characterized with photoluminescence (PL) and transmission electron microscopy (TEM). The PL spectra from the InAs islands demonstrated that annealing resulted in a blueshift in peak energy, a reduction in intensity, and a narrower linewidth in the PL peak. In addition, the TEM analysis revealed the relaxation of strain in some InAs islands with the introduction of the network of 90° dislocations. The correlation between the changes in the PL spectra and the relaxation of strain in InAs islands was discussed.

Humidity effects on (001) BaTiO3 single crystal surface water adsorption

Water adsorption on (001) BaTiO3 single crystal surface under varying relative humidity conditions was studied by ab initio calculations and scanning probe microscopy utilizing different operation modes. At 95% relative humidity water droplets nucleated only on c domains, preferential adsorption location for water dipoles. BaTiO3 (001) surface long 65% relative humidity exposure lead to no contrast between a and c domains observed by electrostatic force microscopy. Ab initio calculations confirm that water molecules prefer to adsorb on c domains due to their higher surface energy.

Magnetoelectric coupling and the hydrogen effect on Ni–PZT–Ni trilayers made by electrodeposition

The magnetoelectric (ME) coupling from 20xa0Hz to 100xa0kHz and the hydrogen effect on Ni–PZT–Ni trilayer composites made by electrodeposition have been investigated. The results show that the magnetoelectric voltage coefficient, αE,31, increases with increased Ni layer thickness, up to αE,31 = 16xa0Vxa0cm−1xa0Oe−1. The ME voltage coefficient decreases with the increase of hydrogen concentration. To prevent the degradation of ME coupling, the plating solution and process parameters of electrodeposition should be chosen suitably. Moreover, an additional outgassing process after electrodeposition can reduce the hydrogen concentration and effectively promote ME coupling.

Effects of Hydrogen and Chloride Ions on Automobile Interstitial-Free Steel Corrosion

Effects of hydrogen and chloride ions on the corrosion behavior of interstitial-free steel were investigated. The anodic polarization tests show that the corrosion and pitting potentials decrease w...