1 / 20

Tackling multiferroic YMnO 3 and BiFeO 3 in BM25

Tackling multiferroic YMnO 3 and BiFeO 3 in BM25 17-APR-2012, http:// usuaris.tinet.cat/~xmarti/talks. X. Marti, V. Holy Charles University, Prague P. Ferrer, T. Schulli ESRF, Grenoble J. Herrero-Albillos BESSY, Berlin J. Narvaez, G. Catalan CIN2, Barcelona N. Barrett,

page
Download Presentation

Tackling multiferroic YMnO 3 and BiFeO 3 in BM25

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Tackling multiferroic YMnO3 and BiFeO3 in BM25 17-APR-2012, http://usuaris.tinet.cat/~xmarti/talks X. Marti, V. Holy Charles University, Prague P. Ferrer, T. Schulli ESRF, Grenoble J. Herrero-Albillos BESSY, Berlin J. Narvaez, G. Catalan CIN2, Barcelona N. Barrett, CEA, Gif-sur-Yvette M. Alexe MPI, Halle http://usuaris.tinet.cat/~xmarti/talks xavi.mr@gmail.com

  2. Tackling multiferroic YMnO3 and BiFeO3 in BM25 17-APR-2012, http://usuaris.tinet.cat/~xmarti/talks X. Marti, V. Holy Charles University, Prague P. Ferrer, T. Schulli ESRF, Grenoble J. Herrero-Albillos BESSY, Berlin J. Narvaez, G. Catalan CIN2, Barcelona N. Barrett, CEA, Gif-sur-Yvette M. Alexe MPI, Halle Something http://usuaris.tinet.cat/~xmarti/talks xavi.mr@gmail.com

  3. Courtesy of G. Catalan

  4. Small changes of the out-of-plane parameter • …and confined in a few (?) nm thick topmost surface Ei αi BiFeO3 http://henke.lbl.gov/optical_constants/

  5. xavi.mr@gmail.com Correction for refraction http://usuaris.tinet.cat/~xmarti/talks xavi.mr@gmail.com

  6. Small changes of the out-of-plane parameter • …and confined in a few (?) nm thick topmost surface http://henke.lbl.gov/optical_constants/

  7. Small changes of the out-of-plane parameter • …and confined in a few (?) nm thick topmost surface To circumvent refraction we scanned both energy and incidence angle

  8. The inter-planar distances are a fingerprint of each material/phase/skin Periodicites and directions Only periodicities http://usuaris.tinet.cat/~xmarti/talks xavi.mr@gmail.com

  9. xavi.mr@gmail.com BULK SKIN Changing the energy (no refraction correction required) Q (no alignment required) There is a skin layer THICKNESS < 40 nm

  10. xavi.mr@gmail.com BULK SKIN Changing the energy (no refraction correction required) shift splitting Q (no alignment required) There is a skin layer THICKNESS < 40 nm

  11. Measured Corrected BULK SKIN Changing the energy (no refraction correction required) Q Q There is a skin layer. THICKNESS < 40 nm xavi.mr@gmail.com

  12. Measured Corrected BULK SKIN Changing the energy (no refraction correction required) Changing the angles There is a skin layer. THICKNESS < 40 nm xavi.mr@gmail.com

  13. X-ray diffraction Impedance Heat capacity and magnetic susceptibility Temperature dependence (low temperature) The skin has its own phase transitions Ac anomalies seen in 3 samples by 3 different growers !!! Independent of polishing process xavi.mr@gmail.com

  14. YMnO3 I. Fina, F. Sanchez, J. Fontcuberta, ICMAB J. Ander Gallastegui, F. Jimenez Villacorta xavi.mr@gmail.com More FE Less FE

  15. YMnO3 I. Fina, F. Sanchez, J. Fontcuberta, ICMAB J. Ander Gallastegui, F. Jimenez Villacorta xavi.mr@gmail.com More FE Less FE

  16. YMnO3 I. Fina, F. Sanchez, J. Fontcuberta, ICMAB J. Ander Gallastegui, F. Jimenez Villacorta Strained YMnO3 thin films EXAFS XRD L S d Bonding angle Magnetic properties Ferroelectric properties

  17. xavi.mr@gmail.com EXAFS L S

  18. xavi.mr@gmail.com EXAFS XRD More FE L S d Bonding angle Magnetic properties Ferroelectric properties Less FE More FE Less FE

  19. SKIN BiFeO3 (AF, FE) = BULK

  20. Tackling multiferroic YMnO3 and BiFeO3 in BM25 17-APR-2012, http://usuaris.tinet.cat/xmarti/talks THANKS FOR YOUR ATTENTION !! xavi.mr@gmail.com • EXAFS: • bonding angle in YMnO3films increases with decreasing strain • - Grazing incidence: • evidences a BiFeO3skin layer.

More Related