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MSE Seminar - Prof. Manfred Wuttig, University of Maryland
Friday, April 18, 2008
1:00 p.m.
Rm. 2108, Chemical and Nuclear Engineering Bldg.
For More Information:
Annette Mateus
301 405 5207

“Unorthodox Synthesized Magnetoelectrics”

[Pb1.1(Zr0.53bTi0.47)O3]50/[(Ni1-xCox)Fe2O4]50, x=0.0A, 0.2 and 1.0, PZT/NFCO, magnetoelectric composites (MECs) were synthesized by crystallizing spinodally magnetic field decomposed amorphous gelsA. The polymeric precursor solution was prepared using the Pechini method: The solutions containing Pb, Zr, Ti and Ni, Fe components were mixed by mechanical stirring at 80°C. After refluxing and distilling for 1 h at 80°C a lightly red colored sol was obtained which was deposited onto a Au- electroded commercial Si/SiO2 substrate. The ensuing nanolamellar ME structures, characterized by AFM, MFM, (Lorentz) TEM and SEM, are periodic and anisotropic. They evolve gradually in the temperature range from room temperature to 300°C. Their period and macroscopic ferromagnetic, -electric and ME properties agree with theoretical estimates. The magnetic anisotropy field is determined by the shape anisotropy of the lamellae and the ME characteristics agree with macroscopically accepted values. The above MECs have also been synthesized by blockcopolymer techniques. Here, the nanostructure of the composite is determined by the molecular weight and fraction f of the two blockcopolymers, BCP1 and BCP2, into which the components have been dissolved. If <BCP1PZT>/<BCP2NFCO> ≈1/3 the MEC is hexagonal as also observed. The talk reports on the synthesis, nanostructure evolution and properties of one MEC.

A S. Ren and M. Wuttig, APL 91, 083501 (2007)

For more information, contact Annette Mateus at (301) 405-5207 or amateus@umd.edu.

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