|About this Abstract
||Materials Science & Technology 2011
||Interfaces, Grain Boundaries and Surfaces from Atomistic and Macroscopic Approaches -- Fundamental and Engineering Issues
||Materials by Design: A Magnetization Graded Multiferroic Composite for Ultra Sensitive Magnetic Field Sensors
||Sanjay K Mandal, Gollapudi Sreenivasulu, Vladimir Petrov, Gopalan Srinivasan
|On-Site Speaker (Planned)
Pico-Tesla magnetic field sensors based on multiferroic composites consisting of magnetization-graded ferromagnetic and ferroelectric phases are discussed. The strain mediated coupling in such composites, in general, requires a bias magnetic field and an ac magnetic field. This report is on the observation of ME interactions under zero-bias in a bilayer of PZT and a ferromagnetic layer in which the magnetization is graded with the use of Ni and Metglas. At low-frequencies, the ME coefficient range from 0.3 to 1.6 V/cm Oe and depends on the thickness of Metglas. A similar dependence is also observed for the ME coupling at bending modes. The zero-bias ME coupling is attributed to coupling between the transverse magnetization due to magnetization grading at the interface of Ni-Metglas and the in-plane ac magnetic field. AC magnetic field sensors based on the graded bilayers show sensitivities on the order of 60 pT/(Hz)1/2.
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