Dr S.M. Koohpayeh Assistant Research Scientist Institute for Quantum Matter Department of Physics and Astronomy The Johns Hopkins University Baltimore, 21218 MD USA E-mail: Koohpayeh@jhu.edu Office Tel.: 410-516-7687

B.Sc., Materials Science & Engineering, Shiraz University, 1996-2000
M.Sc., Materials Science & Engineering, Sharif University of Technology, 2000-2002
Ph.D., Metallurgy & Materials, University of Birmingham, UK, 2003-2007
Postdoctoral Research Fellow, Metallurgy & Materials, University of Birmingham, UK, 2007-2009

Research Interests:

• Bulk crystal growth and solidification of functional/advanced materials (e.g. magnetic, optical and superconducting materials) from melt by techniques such as optical floating zone technique, TSFZ, RF floating zone, Bridgman, Tri-arc and Czochralski.
• Characterization, structure-property relationships and defect-related properties of oxides
• Diluted magnetic semiconductors, in particular, transition metal-doped oxide materials

Journal publications:

1. Cr-doped TiO₂ (rutile): Ferromagnetism in bulk form?
Submitted to Journal of Applied Physics
S.M. Koohpayeh, A.J. Williams, J.S. Abell, J. Lim and E. Blackburn

2. Anomalous parity- and time-odd atomic multipoles in magnetoelectric GaFeO₃ as seen via soft x-ray diffraction
Physical Review B, vol. 80, Issue 14, id. 140410
U. Staub, Y. Bodenthin, C. Piamonteze, M. Garcia- Fern\'andez, V. Scagnoli, M. Garganourakis, S. Koohpayeh, D. Fort, and S. W. Lovesey

3. Thermal characterization of an optical floating zone furnace: a direct link with controllable growth parameters
Journal of Crystal Growth, Volume 311, Issue 8, 1 April 2009, Pages 2513-2518
S.M. Koohpayeh, D. Fort, A. Bradshaw and J.S. Abell

4. Effect of oxygen content on dielectric properties of float-zone grown titanium dioxide (TiO₂) crystals
Journal of Ferroelectrics, Volume 377, No. 1, 2008, pages 1-21
K.K. Bamzai, S.M. Koohpayeh, B. Kaur, D. Fort and J.S. Abell

5. The optical floating zone technique: a review of experimental procedures with special reference to oxides
(Selected as Top 25 Hottest Articles)
Journal of Progress in Crystal Growth and Characterization of Materials, Volume 54, Issues 3-4, September-December 2008, Pages 121-137
S.M. Koohpayeh, D. Fort and J.S. Abell

6. Study of ferromagnetism in Co-doped rutile powders and float-zone grown single crystals
Journal of Magnetism and Magnetic Materials, Volume 320, Issue 6, March 2008, Pages 887-894
S.M. Koohpayeh, D. Fort, A. Bevan, A. Williams and J.S. Abell

7. The influence of growth rate on the microstructural and magnetic properties of float-zone grown ErFeO₃ crystals
Journal of Magnetism and Magnetic Materials, 309 (2007) 119-125
S.M. Koohpayeh, D. Fort, J.S. Abell, A. Williams, A. Bevan and K.K. Bamzai

8. Some observations on the growth of rutile single crystals using the optical floating zone method
Journal of Crystal Growth 282 (2005) 190-198
S.M. Koohpayeh, D. Fort and J.S. Abell

9. Effect of strain-hardening exponent on the occurrence of central burst in aluminium wire drawing process
Presented at Interwire 2005 Symposium, Georgia World Congress Center, Atlanta, GA, USA (May 14-19, 2005), and published in the Wire International Journal, January (2006) 63-66.
S.M. Koohpayeh and A. Karimi Taheri

Invited Speaker:

Talk title: "Crystal growth in Metallurgy and Materials at Birmingham with special reference to metal oxides"

• 08 Oct. 2008, Physics Department, Uni. of London, UK.
• 17 Oct. 2008, Physics Department, Uni. of Birmingham, UK.

Conference presentations:

1. The crystal growth and magnetic properties of RFeO3 (R=Er and Y)
2006 annual BACG (British Association for Crystal Growth) conference, 10-12 Sept. 2006 in Edinburgh
S.M. Koohpayeh, J.S. Abell, A.I. Bevan, D. Fort, A.J. Williams

2. Optimizing growth parameters for rutile single crystals by the float-zone technique using a four mirror image furnace
2004 Annual Conference of the British Association for Crystal Growth, Poster presentation, University of Leeds, UK Sept. 5-7, 2004
S.M. Koohpayeh, D. Fort and J.S. Abell

3. Effect of strain-hardening exponent on the occurrence of central burst in aluminium wire drawing process
Interwire 2005 Symposium, Georgia World Congress Center, Atlanta, GA, USA, May 14-19, 2005
S.M. Koohpayeh and A. Karimi Taheri