ELFT HÍRADÓ

[bordacs.sandor AT wigner.bme.hu]

Kedves Kollégák!

Szeretném meghívni önöket a BME TTK Fizika Tanszékének szemináriumára, 
melyet 2018. június 6-án 9:30-tól tartunk a BME F épület I. lépcsőház
I. emelet Schay termében.

Dr. Stephan Krohns - Experimental Physics V, University of Augsburg
Electric-field poling of improper ferroelectrics - step towards domain 
wall based nanoelectronics?

Manipulating domains within ferroelectric semiconductors has attracted 
attention in recent years for potentially allowing domains and domain
walls to be used as functional elements in nanoelectronics. One type of 
multiferroic material, hexagonal manganites, has shown particular 
potential because of their unusual, improper ferroelectric properties. 
We report an electric-field poling study of the geometric-driven 
improper ferroelectric h-ErMnO3. From a detailed dielectric analysis, we 
deduce the temperature- and frequency-dependent range for which 
single-crystalline h-ErMnO3 exhibits purely intrinsic dielectric 
behavior. This provides a comprehensive experimental study addressing 
the switching dynamics in hexagonal manganites. Controlling the domain 
walls via electric fields brings us an important step closer to their 
utilization in resource-efficient domain-wall-based electronics.

References:
[1] C. Helbig, C. Kolotzek, A. Thorenz, A. Reller, A. Tuma, M. 
Schafnitzel, S. Krohns, Benefits of Resource Strategy for Sustainable 
Materials Research and Development, Sustainable Materials and 
Technologies 12, 1–8 (2017).
[2] E. Ruff, S. Krohns, M. Lilienblum, D. Meier, M. Fiebig, P. 
Lunkenheimer, A. Loidl, Conductivity contrast and tunneling charge 
transport in the vortex-like ferroelectric domain patterns of 
multiferroic hexagonal YMnO3, Phys. Rev. Lett. 118, 036803 (2017)
[3] A. Ruff, Z. Li, A. Loidl, J. Schaab, M. Fiebig, A. Cano, Z. Yan, E. 
Boureet, J. Glaum, D. Meier, S. Krohns, Freqeuncy dependent polarisation 
switching in h-ErMnO3, Appl. Phys. Lett. 112, 182908 (2018).
[4] T.S. Holstad, D.M. Evans, A. Ruff, D.R. Smabraten, J. Schaab, Ch. 
Tzschaschel, Z. Yan, E. Bourret, S.M. Selbach, S. Krohns, D. Meier, 
Electronic bulk and domain wall properties in B-Site doped hexagonal 
ErMnO3, Phys. Rev. B 97, 085143 (2018).
[5] J. Schaab, S.H. Skjaervo, S. Krohns, X. Dai, M. Holtz, A. Cano, M. 
Lilienblum, Z. Yan, E. Bourret, D.A. Muller, M. Fiebig, S.M. Selbach, D. 
Meier, Electrical half-wave rectification at improper ferroelectric 
domain walls, arXiv:1803.08253

Minden érdeklődőt szívesen látunk!

Üdvözlettel,
Bordács Sándor

--
Dr. Sandor Bordacs
assistant prof.
Department of Physics, Budapest University of Technology and Economics
http://magnetooptics.phy.bme.hu
Tel: 36-1-4633056
Fax: 36-1-4634180