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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,

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Tackling multiferroic YMnO 3 and BiFeO 3 in BM25

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  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.

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