Fengyuan Yang's Laboratory
Magnetism and Spin in 2D and 1D Heterostructures

Principle Investigator:
Fengyuan Yang
Assistant Professor

Department of Physics
Ohio State University
191 West Woodruff Avenue
Columbus, Ohio 43210
Curriculum Vitae

Office: Physics Research Building 2006, phone: 614-688-4390
Lab: Physics Research Building 0109, phone: 614-688-5871

Students:
Xianwei Zhao
Adam Hauser

Teaching:
Spring 2008: Physics 780I20, Condensed Matter Physics
Autumn 2008: Physics 111, Mechanics and Heat
      Click here for Phys 111 12:30 & 1:30pm sessions

Research Interests:

• Complex Oxide Epitaxial Films and Multilayers
  Using ultra-high-vacuum (UHV) sputtering system to fabricate a variety of complex oxide films, including half-metallic double perovskite epitaxial films for magneto-electronic applications. The UHV environment down to 4 x 10^-10 Torr, precise control of sputter gas pressure, O₂ compatible sample heater up to 1000 ^oC, and a number of growth geometries enable the fabrication of high quality oxide epitaxial films and multilayers.
  
• Spin Dynamics and Spin Transport in Semiconductor Nanowires
  Spin relaxation, injection, spin diffusion, and spin detection, in single-crystal semiconductor nanowires using prototype nanowire devices and dielectric matching.
  
• Fabrication of Multilayers and Patterned Structures
  Using UHV sputtering system together with lithography and focused ion beam technique to fabricate a large variety of metallic materials in thin films and patterned structures for superconducting and magnetic studies.
  

Major Instruments

• Ultrahigh vacuum sputtering system

  

• Vibrating sample magnetometer and magnetotransport measurement system

  

• Laser-assisted semiconductor nanowire growth system

  

Selected Publications

1. A. J. Hauser, J. Zhang, L. Mier, R. A. Ricciardo, P. M. Woodward, T. L. Gustafson, L. J. Brillson, and F. Y. Yang, "Characterization of Electronic Structure and Defect States of Thin Epitaxial BiFeO₃ Films by UV-Vis Absorption and Cathodoluminescence Spectroscopies," Appl. Phys. Lett. 92, 222901 (2008).
2. W. C. Liu, C. L. Mak, K. H. Wong, C. Y. Lo, S. W. Or, W. Zhou, A. Hauser, F. Y. Yang, and R. Sooryakumar, "Magnetoelectric and dielectric relaxation properties of the high Curie temperature composite Sr_1.9Ca_0.1NaNb₅O₁₅-CoFe₂O₄," J. Phys. D: Appl. Phys. 41, 125402 (2008).
3. X. W. Zhao and F. Y. Yang, "Synthesis of Epitaxial Silicon Nanowires on Si(111) Substrates Using Ultrahigh Vacuum Magnetron Sputtering," J. Vac. Sci. Technol. B 26, 675 (2008).
4. T. R. Lemberger, I. Hetel, A. J. Hauser, and F. Y. Yang, "Superfluid density of superconductor-ferromagnet bilayers," J. Appl. Phys. 103, 07C701 (2008).
5. X. P. Xie, X. W. Zhao, J. W. Knepper, F. Y. Yang, and R. Sooryakumar, "Evolution of magnetic domain reversal with temperature in Co/Pt multilayers observed by magneto-optical Kerr imaging," Phys. Rev. B 76, 184433 (2007).
6. X. W. Zhao, A. J. Hauser, T. R. Lemberger, and F. Y. Yang, "Growth control of GaAs nanowires using pulsed laser deposition with arsenic over pressure," Nanotechnology 18, 485608 (2007).
7. T. R. Lemberger, I. Hetel, J. W. Knepper, and F. Y. Yang, "Penetration depth study of very thin superconducting Nb films," Phys. Rev. B 76, 094515 (2007).
8. E. D. Lu, D. C. Ingram, A. R. Smith, J. W. Knepper, F. Y. Yang, "Reconstruction control of magnetic properties during epitaxial growth of ferromagnetic MnGa on wurtzite GaN(0001)," Phys. Rev. Lett. 97, 146101 (2006).
9. M. Robinson, Y. Au, J. W. Knepper, F. Y. Yang, and R. Sooryakumar, "Magnetic imaging of layer-by-layer reversal in Co/Pt multilayers with perpendicular anisotropy," Phys. Rev. B 73, 224422 (2006).
10. V. S. Gornakov, Yu. P. Kabanov, O. A. Tikhomirov, and V. I. Nikitenko, S. V. Urazhdin, F. Y. Yang, and C. L. Chien, A. J. Shapiro and R. D. Shull, "Experimental study of the microscopic mechanisms of magnetization reversal in FeNi/FeMn exchange-biased ferromagnet/ antiferromagnet polycrystalline bilayers using the magneto-optical indicator film technique," Phys. Rev. B 73, 184428 (2006).
11. H. Sang, C. L. Chien, and F. Y. Yang, "Periodicity dependence of exchange bias in [Co/Pt]N/Co/CoO multilayers with perpendicular anisotropy," J. Appl. Phys. 99, 013906 (2006).
12. J. W. Knepper and F. Y. Yang, "Oscillatory Interlayer Coupling in Co/Pt Multilayers with Perpendicular Anisotropy," Phys. Rev. B 71, 224403 (2005).
13. F. Y. Yang and C. L. Chien, "Oscillatory Exchange Bias due to an Antiferromagnet with Incommensurate Spin Density Wave," Phys. Rev. Lett. 90, 147201 (2003).
14. Y. Ji, G. J. Strijkers, F. Y. Yang, C. L. Chien, J. M. Byers, A. Anguelouch, G. Xiao, and A. Gupta, "Determination of the Spin Polarization of Half-Metallic CrO₂ by Point Contact Andreev Reflection," Phys. Rev. Lett. 86, 5585 (2001).
15. F. Y. Yang and C. L. Chien, "Spiraling spin structure in exchange-coupled antiferromagnetic layer," Phys. Rev. Lett. 85, 2597 (2000).
16. F. Y. Yang, Kai Liu, Kimin Hong, D. H. Reich, P. C. Searson, and C. L. Chien, "Large magnetoresistance in electrodeposited single-crystal bismuth thin films," Science 284, 1335 (1999).
17. F. Y. Yang, Kai Liu, C. L. Chien, and P. C. Searson, "Large magnetoresistance and finite-size effects in electrodeposited single-crystal Bi thin films," Phys. Rev. Lett. 82, 3328 (1999).

Patent

F. Y. Yang, K. Liu, C. L. Chien, and P. C. Searson, "Bismuth thin films structure and method of construction", U.S. Patent # 6,358,392, March 19, 2002.

Complete list of publication