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212 Clark Hall Center of Nanoscale Systems Cornell University Ithaca, NY 14850

Email address: zl65 (at) Cornell.edu Phone: (607) 255 - 7500 Fax: (607) 255 - 5579

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Objective

Research position on physics fundamentals and application, preferably magnetic systems.

Professional Summary

• Extensive and highly collaborative research in various physical systems, especially magnetic systems.
• Demonstrated skills in sophisticated nanofabrication, material deposition and characterization, magnetic, optical, electric, and high frequency measurement.
• Experienced in publication, presentation. Team-oriented and self-motivated.

Education

Ph. D. Physics. 2006. University of California, San Diego.
M. S. Physics. 2002. Yale University.
B. S. Physics. 2000. Peking University.

Research

2006 - Pres. Postdoctoral Associate at Center of Nanoscale Systems, Cornell University
(With the groups of Robert A. Buhrman and Dan C. Ralph)

Spin Transfer Torque in Nanopillars

• Study switching and dynamics of spin transfer torque in low damping systems.
• X-ray Transimission Microscopy.

2002 - 2006. Research Assistant, UC San Diego.
(With the group of Ivan K. Schuller)

Exchange biased nanostructures

• Demonstrated AF domain size relevance with FM dot size.
• Showed the interaction between exchange bias and magnetic vortex state.
• Modeled the magnetization reversal process by micromagnetic and Monte-Carlo simulation.

Exchange bias thin films

• Demonstrated AF domain size relevance compared with FM domain wall width.
• Demonstrated the existence of FM exchange spring in FM/AF bilayer.
• Systematically studied origins of asymmetric reversal.
• Discovered tunable temperature hysteresis in spontaneous magnetization reversal and its dynamics.

Developing reflection X-ray holography
(Collaboration with S. Sinha and S. Roy)

• Designed the experiment, and supported by calculation.
• Fabricated prototype samples for beam-line experiment.

Spin Polarized Tunneling

• Studied bias-dependent oscillations in magneto-resistance in MgO tunnel junctions.
• Theoretically studied the anomalous parabolic behavior of tunnel junctions at high biases.

2000-2002 Research Assistant, Yale University.
(With the group of Robert Grober)

Photoluminescence of GaAs/AlGaAs quantum well

• Studied temperature dependence of integral intensity of PL spectrum of GaAs/AlGaAs quantum well.
• Proposed and designed the high-impedance ground plane substrate with up to 8 times single molecule PL enhancement.

1998-2000 Research Assistant. Peking University, China.
(With the group of Dapeng Yu)

Fabrication and STM studies of silicon nanowires

• Fabricated in situ silicon nanowire on STM tips by CVD

Skills

• Nanofabrication: e-beam and photo lithography, RIE, ion beam etching.
• Thin film growth: e-beam evaporation, magnetron sputtering, and their maintenance.
• Magnetism characterization: SQUID, MFM, magneto-optical Kerr effect, cryogenics, etc.
• Materials characterization: AFM/MFM, SEM, x-ray diffraction, profilometry, PL spectroscopy.
• Modeling techniques: micromagnetics, Monte-Carlo simulation, Matlab.
• Extensive computer skills: graphics, mathematics, CAD software, C++, Labview, SQL, web programming, supercomputer experience, etc.

Teaching

2000-2002 Yale University. Teaching assistant for lower division physics for medical school students.

2004 UC, San Diego. Teaching Assistant for Solid State Physics for physics major undergraduates, including discussion session lecturing.

Honors and Awards

• 2005 Best Poster Award. MMM 2005 at San Jose, CA.
• 2003 Best Poster Award. Trends in NanoTechnology (TNT) 2003 at Salamanca, Spain.
• 2003-2005. Cal(IT)2 Fellowship from California Institute of Telecommunication and Information Technology.
• 2000-2002 Fan Family Fellowship from Yale Univesity

Patents

"Exchange-bias based multi-state magnetic memory and logic devices and magnetically stabilized magnetic storage" (International Patent No. PCT/US05/025129, pending, 2005 - publication WO2006017367).

Publications

17 papers published in refereed journals, and 7 papers in preparation.

1. Johannes Eisenmenger, Zhi-Pan Li, Waldemar A. A. Macedo, and Ivan K. Schuller, Exchange Bias and Asymmetric Reversal in Nanostructured Dot Arrays , Phys. Rev. Lett. 94 , 057203 (2005). pdf
2. Zhi-Pan Li, Oleg Petracic, Johannes Eisenmenger, and Ivan K. Schuller, Reversal behavior of exchange-biased submicron dots , Appl. Phys. Lett. 86 , 072501 (2005). pdf
3. Krishanu Ray, Michael D. Mason, Celeste Yang, Zhi-Pan Li, and Robert D. Grober , Single-molecule signal enhancement using a high - impedance ground plane substrate, Appl. Phys. Lett. 85 , 5520 (2004). pdf
4. Igor Roshchin, Oleg Petracic, Rafael Morales, Zhi-Pan Li, X. Batlle and Ivan K. Schuller, Lateral length scales in exchange bias, Euro. Phys. Lett., 71, 297 (2005). pdf
5. Justin Olamit , Elke Arenholz, Zhi-Pan Li, Oleg Petracic, Igor V. Roshchin, Ivan K. Schuller, and Kai Liu, Loop Bifurcation and Magnetization Rotation in Exchange Biased Ni/FeF2 , Phys. Rev. B 72, 012408 (2005).pdf
6. S. Roy, M.R. Fitzsimmons, S. Park, M. Dorn, O. Petracic, Igor V. Roshchin, Zhi-Pan Li, X. Batlle, R. Morales, A. Misra, X. Zhang, K. Chesnel, J.B. Kortright, S.K. Sinha and Ivan K. Schuller, Depth profile of uncompensated spins in an exchange bias system , Phys. Rev. Lett. 95, 047201 (2005). pdf
7. O. Petracic, Zhi-Pan Li, Igor V. Roshchin, M. Viret, R. Morales, X. Batlle ,and Ivan K. Schuller, Bi-domain state in the exchange bias system FeF₂/Ni , Appl. Phys. Lett. 87, 222509 (2005).pdf
8. Justin Olamit, Zhi-Pan Li, Ivan K. Schuller, Kai Liu, Angular Dependence of Exchange Anisotropy on Cooling Field in FM/Fluoride Thin Films, Phys. Rev. B. 73, 24413 (2006) pdf
9. Elke Arenholz, Kai Liu, Zhi-Pan Li and Ivan K. Schuller, Magnetization reversal of uncompensated Fe moments in exchange biased Ni/FeF2 bilayers, Appl. Phys. Lett. 88, 072503 (2006).pdf
10. Zhi-pan Li, Johannes Eisenmenger, Casey W. Miller, and Ivan K. Schuller, Anomalous Spontaneous Reversal in Magnetic Heterostructures, Phys. Rev. Lett., 96, 137201 (2006). pdf
11. Zhi-pan Li, Oleg Petracic, Rafael Morales, Justin Olamit, Xavier Batlle, Kai Liu, and Ivan K. Schuller, Asymmetric Reversal in Inhomogeneous Magnetic Heterostructures, Phys. Rev. Lett., 96, 217205 (2006). pdf
12. R. Morales, Zhi-Pan Li, O. Petracic, X. Batlle and Ivan K. Schuller, Magnetization depth dependence and reversal processes in exchange coupled FeF2/FM bilayer, Appl. Phys. Lett. 89, 072504 (2006). pdf
13. Sunil K. Sinha, Sujoy Roy, M. R. Fitzsimmons, S. Park, M. Dorn, Oleg Petracic, Igor V. Roshchin, Zhi-Pan Li, Xavier Batlle, Rafael Morales, A. Misra, X. Zhang, K. Chesnel, J. B. Kortright, Ivan K. Schuller, Combined neutron and synchrotron studies of magnetic films, Pramana - J. Phys. 67, 47 (2006).
14. Casey W. Miller, Zhi-Pan Li, R. Dave, J. M. Slaughter, Ivan K. Schuller, and J. Akerman, Origin of the breakdown of Wentzel-Kramers-Brillouin-based tunneling models, Phys. Rev. B 74, 212404 (2006). pdf
15. Justin Olamit, Zhi-Pan Li, Ivan K. Schuller, and Kai Liu, Alignment-Sensitive Reversal Mechanisms of Epitaxial-FeF2/Polycrystalline-Ni Exchange Biased Thin Films, Appl. Phys. Lett. 90, 032510 (2007).pdf
16. Casey W. Miller, Z.-P. Li, J. Akerman, and Ivan K. Schuller, Impact of interfacial roughness on tunneling conductance and extracted barrier parameters, Appl. Phys. Lett. 90, 043513 (2007). pdf
17. Zhi-Pan Li, Casey W. Miller, Igor V. Roshchin and Ivan K. Schuller, Origin of spontaneous magnetization reversal in exchange biased heterostructures, Phys. Rev. B. 76, 014423 (2007). pdf
18. Casey W. Miller, Zhi-Pan Li, Ivan K. Schuller, R. W. Dave, J. M. Slaughter, and Johan Akerman, Dynamic Resonant Tunneling, Phys. Rev. Lett. 99, 047206 (2007). pdf
19. M. R. Fitzsimmons, B. Kirby, S. Roy, Zhi-Pan Li, I. V. Roshchin, R. Morales, S. K. Sinha and Ivan K. Schuller, Depth Profile of Pinned Magnetization Across an Exchange Coupled Interface, Phys. Rev. B. 75, 214412(2007). pdf
20. G. D. Fuchs, J. C. Sankey, V. S. Pribiag, L. Qian, P. M. Braganca, A. G. F. Garcia, E. M. Ryan, Zhi-Pan Li, O. Ozatay, D. C. Ralph, and R. A. Buhrman, Spin-torque ferromagnetic resonance measurements of damping in nanomagnets, App. Phys. Lett. 91, 062507 (2007). pdf
21. M. R. Fitzsimmons, S. Roy, B. J. Kirby, S. Park, Igor V. Roshchin, Zhi-Pan Li, J.B. Kortright, S.K. Sinha, Ivan K. Schuller, Combined magnetic X-ray and polarized neutron reflectivity study of the origins of exchange bias in the Co/FeF₂ system, Superlattices and Microstructures, 41, 109 (2007). pdf

Invited Talks

1. "Anomalous Magnetization Reversal in Exchange Biased Thin Films and Nanostructures." at Cornell University condensed matter seminar.
2. "Anomalous Magnetization Reversal in Exchange Biased Thin Films and Nanostructures." at Argonne National Laboratory condensed matter seminar.
   

Conference Presentations

1. "Size Effects in Exchange Biased Nanostructures." J. Eisenmenger, Z.-P. Li, O. Petracic, I. V. Roshchin, K. Liu, J. Nogues, C. Leighton, H. Masuda, K. Nishio and I. K. Schuller. Trends in NanoTechnology (TNT) 2003, Salamanca, Spain. Won Best Poster Award.
2. "Magneto-optical Study of Exchange Biased Nanodots." Z.-P. Li, J. Eisenmenger, O. Petracic and I. K. Schuller. 9th Joint MMM/Intermag 2004, Anaheim, CA.
3. "Asymmetric Reversal in Exchange Bias: Experiment and Micromagnetic Simulation." Z.-P. Li, O. Petracic, R. Morales, J. Olamit, K. Liu and I. K. Schuller. APS March meeting 2005, Los Angeles, CA.
4. "Domain Size Relevance in Exchange Biased Nanostructures." Z.-P. Li, R. Morales, O. Petracic, I. K. Schuller. 50th Annual Conference on Magnetism and Magnetic Materials 2005, at San Jose, CA. Won Best Poster Award.
5. "Anomalous Spontaneous Reversal in Heterostructured Magnetic Materials." Z.-P. Li, C. W. Miller, J. Eisenmenger, I. V. Roshchin and I. K. Schuller. 50th Annual Conference on Magnetism and Magnetic Materials 2005, at San Jose, CA.
6. "Dynamics of Spontaneous Magnetization Reversal in Exchange Biased Bilayers." Z.-L. Li, C. W. Miller, I. V. Roshchin, I. K. Schuller. APS March meeting 2006. Baltimore, MD.
7. "Competing Mechanisms in Asymmetric Magnetization Reversal in Exchange Biased Bilayers." Z.-P. Li, O. Petracic and I. K. Schuller. APS March meeting 2006. Baltimore, MD.
8. "Magneto-optical study on exchange biased submicron iron dots." O. Petracic, Z.-P. Li, J. Eisenmenger, I. K. Schuller. 2nd Seeheim Conference on Magnetism (SCM) 2004, at Seeheim, Germany.
9. "Anomalous Spontaneous Reversal in Magnetic Heterostructures." Z.-P. Li, C.W. Miller, J. Eisenmenger, I.V. Roshchin and I.K. Schuller. IEEE Intermag 2006. San Diego, CA.
10. "Domains and magnetization rotation in exchange biased Ni/FeF2", J. Olamit, Kai Liu, Z.-P. Li, O. Petracic, I. V. Roshchin, and I. K. Schuller, 49th Annual Conference on Magnetism and Magnetic Materials, Jacksonville, Florida, November 11, 2004.
11. "Bi-domain state in the exchange bias system FeF2/Ni." O. Petracic, Z.-P. Li, I. V. Roshchin, M. Viret, R. Morales, X. Batlle, I. K. Schuller. APS March meeting 2005, at Los Angeles, CA.
12. "Magnetization depth dependence and reversal processes in exchange coupled FeF2/F (F=Fe,Ni,Py) bilayers." R. Morales, Z.-P. Li, O. Petracic, X. Batlle, I. K. Schuller. APS March meeting 2005, Los Angeles, CA.
13. "Lateral length scales and local character of exchange bias." I. V. Roshchin, O. Petracic, R. Morales, Z.-P. Li, X. Batlle and I. K. Schuller. APS March meeting 2005. Los Angeles, CA.
14. "Angular Dependence of Exchange Anisotropy on Cooling Field in Exchange Biased Films." J. Olamit, K. Liu, Z-P. Li and I. K. Schuller. APS March meeting 2005. Los Angeles, CA.
15. "Domains and Magnetization Rotation in Exchange Biased Ni/FeF2." J. Olamit, E. Arenholz, Z.-P. Li, O. Petracic and I. K. Schuller, K. Liu. APS March meeting 2005. Los Angeles, CA.
16. "The spatial profile of unpinned and pinned uncompensated spins in the antiferromagnetic layer of an exchange bias heterostructure determined with polarized neutron reflectometry." M.R. Fitzsimmons, S. Park, A. Misra, X. Zhang, S. Roy, M. Dorn, O. Petracic, I.V. Roshchin, Z.-P. Li, X. Batlle, R. Morales, S.K. Sinha and Ivan K. Schuller. APS March meeting 2005. Los Angeles, CA.
17. "Angular Dependence of Exchange Anisotropy on Cooling Field in Epitaxial FeF2/Ni." J. Olamit, K. Liu, Z-P. Li and I.K. Schuller. 50th Annual Conference on Magnetism and Magnetic Materials 2005, at San Jose, CA.
18. "Angular Dependence of Exchange Anisotropy on Cooling Field in Epitaxial FeF2/Ni." J. Olamit, Kai Liu, Z.-P. Li and I. K. Schuller, American Physical Society, California Section Fall Meeting: "21st Century Physics in the Golden State", Sacramento, California, October 22, 2005. Winner of 3rd place Margaret Burbidge Award for Best Experimental Research.
19. "Alignment-Sensitive Reversal Mechanisms of Epitaxial-FeF2/Polycrystalline-Ni Exchange Biased Thin Films." J. Olamit, K. Liu, Z.-P. Li and I. K. Schuller. APS March Meeting 2006. Baltimore, MD.
20. "Uncompensated Fe moments in positively exchange biased Ni/FeF2 bilayers." Elke Arenholz, Kai Liu, Zhi-Pan Li and I. K. Schuller. APS March Meeting 2006. Baltimore, MD.
21. "Alignment-Sensitive Reversal Mechanisms of Epitaxial-FeF2/Polycrystalline-Ni Exchange Biased Thin Films." J. Olamit, K. Liu, Z.-P. Li, I. K. Schuller. 2006 Spring Materials Research Society Meeting 2006. San Francisco.
22. "Uncompensated Fe moments in positively exchange biased Ni/FeF2 bilayers." E. Arenholz, K. Liu, Z.-P. Li and I. K. Schuller. APS March Meeting 2006.
23. "Influence of the antiferromagnet spin structure on exchange bias." R. Morales, Z.-P. Li, J. M. Alameda and I. K. Schuller. APS March Meeting 2006.
24. "The relationship between the sign of exchange bias and the magnetization depth profile of Co/FeF2." M. Fitzsimmons, B. Kirby, S. Roy, Z.-P. Li, I. V. Roshchin, R. Morales and I. K. Schuller. APS March Meeting 2006.
25. "Bias dependent oscillations in spin polarized tunneling." C. W. Miller, J. Akerman, Z.-P. Li and I. K. Schuller. APS March Meeting 2006.
26. "Fabrication and magnetism of sub-100 nm exchange-biased magnetic dot arrays and porous networks." C.-P. Li, I. V. Roshchin, Z.-P. Li and I. K. Schuller. APS March Meeting 2006.
27. "Effect of Anisotropy and Exchange Bias on Reversal of Sub-100 nm Magnetic Dots." I.V. Roshchin, C. Li, Z. Li, J. Mejia-Lopez, D. Altbir, A.H. Romero, R.K. Dumas, K. Liu, X. Batlle and I. K. Schuller. IEEE Intermag 2006. San Diego, CA.
28. "Magnetization Reversal in the Ferromagnetic Layer, the Antiferromagnetic Layer and Near the Interface of Exchange Biased FeF2 and MnF2 Systems." E. Arenholz, K. Liu, Z.-P. Li and I. K. Schuller. IEEE Intermag 2006. San Diego, CA.
29. "Magnetic Structure in Exchange-coupled Antiferromagnet-Ferromagnet Thin Films." R. Morales, Z.-P. Li, O. Petracic, X. Batlle, J. Alameda and I. K. Schuller. IEEE Intermag. 2006. San Diego, CA.

Reference

Available upon requests.