(INVITED) Large magnetoelectric couplings in lead-free nanocomposites

Aiping Chen ¹, Ahmad Eshghinejad ², Yaomin Dai ¹, John Bowlan ¹, Zhongchang Wang ³, Erik Enriquez ¹, Erik Knall ¹, Judith MacManus-Driscoll ⁴, Haiyan Wang ⁵, Antoinette Taylor ¹, Rohit Prasankumar ¹, Jiangyu Li ², Dmitry Yarotski ¹, Quanxi Jia ⁶

¹ Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, United States
² University of Washington, Seattle, United States
³ International Iberian Nanotechnology Laboratory, Braga, Portugal
⁴ University of Cambridge, Cambridge, United Kingdom
⁵ Purdue University, Purdue University, United States
⁶ University at Buffalo - The State University of New York, Buffalo, United States

The vertically aligned BaTiO₃:CoFe₂O₄ nanocomposites exhibit multiferroic properties above room temperature, which has been confirmed by the temperature dependent second harmonic generation (SHG) and magnetization measurements. Both magnetization and polarization were found aligned along the out-of-plane direction due to large out-of-plane lattice strain. The magnetic field dependent SHG has demonstrated the coupling between BTO and CFO components. The direct magnetoelectric (ME) coupling is investigated by using piezoresponse force microscopy (PFM) under different magnetic fields. A large longitudinal ME coefficient α₃₁ of over 2000 mV/cm Oe is estimated by averaging the PFM amplitude change of BTO matrix upon applying magnetic fields. Phase field simulation found that the ME coupling strongly depends on the size of nanopillars. This work explored the mechanisms of magnetoelectric couplings and the coupling strength in vertically aligned metal-oxide nanocomposites.

Reference:

Th-S67-O-04

Presenter/s:

Aiping Chen

Presentation type:

Oral communication

Room:

Room2

Chair/s:

Raj N Singh

Date:

Thursday, September 7th, 2017

Time:

12:00 - 12:15

Session times:

11:15 - 12:30

IMF2017