| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Interfaces, Grain Boundaries and Surfaces from Atomistic and Macroscopic Approaches -- Fundamental and Engineering Issues
|
| Presentation Title |
Materials by Design: A Magnetization Graded Multiferroic Composite for Ultra Sensitive Magnetic Field Sensors |
| Author(s) |
Sanjay K Mandal, Gollapudi Sreenivasulu, Vladimir Petrov, Gopalan Srinivasan |
| On-Site Speaker (Planned) |
Gopalan Srinivasan |
| Abstract Scope |
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. |
| Proceedings Inclusion? |
Definite: A CD-only volume |