Padraic Shafer

Education

Professional Experience

2012 – Present
Staff Research Scientist
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA

2009 – 2012
Postdoctoral Research Fellow
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA

2004 – 2009
Graduate Student Researcher
Department of Materials Science and Engineering – NSF Center of Integrated Nanomechanical Systems, University of California, Berkeley, CA

2002 – 2004
Process Integration Engineer
Logic & Embedded-RAM Alliance for Development, IBM Microelectronics, East Fishkill, NY

1999 – 2002
Process Development Engineer
DRAM Development Alliance, IBM Microelectronics, East Fishkill, NY

Padraic studies electronic order at domain walls and thin film interfaces in complex oxides and magnetic metals using a combination of resonant soft x-ray absorption and scattering. He also investigates spin-pumped dynamics in magnetic multilayers using x-ray based ferromagnetic resonance.

P. Shafer*, P. García-Fernández*, P. Aguado-Puente, A. R. Damodaran, A. K. Yadav, C. T. Nelson, S.-L. Hsu, J. Wojdeł, J. Íñiguez, L. W. Martin, E. Arenholz, J. Junquera, and R. Ramesh, Emergent chirality in polar vortex superlattices, Proc. Natl. Acad. Sci. (Early ed. online, Jan. 2018) [doi: 10.1073/pnas.1711652115]

J. Li, L. R. Shelford, P. Shafer, A. Tan, J. X. Deng, P. S. Keatley, C. Hwang, E. Arenholz, G. van der Laan, R. J. Hicken, and Z. Q. Qiu, Direct detection of pure spin-current by x-ray pump-probe measurements, Phys. Rev. Lett. 117, 076602 (2016). [doi: 10.1103/PhysRevLett.117.076602]

J. He*, P. Shafer*, T. R. Mion*, V. T. Tra, Q. He, J. T. Kong, Y.-D. Chuang, W. L. Yang, M. J. Graf, J.-Y. Lin, Y.-H. Chu, E. Arenholz, and R.-H. He, Observation of a three-dimensional quasi-long-range electronic supermodulation in YBa₂Cu₃O_7−x/La_0.7Ca_0.3MnO₃ heterostructures, Nat. Commun. 7, 10852 (2016). [doi: 10.1038/ncomms10852]

Y. Cao, X. Liu, P. Shafer, S. Middey, D. Meyers, M. Kareev, Z. Zhong, J.W. Kim, P. J. Ryan, E. Arenholz, and J. Chakhalian, Anomalous orbital structure in a spinel–perovskite interface, npj Quantum Materials 1, 16009 (2016). [doi: 10.1038/npjquantmats.2016.9]

*These authors contributed equally.