Spintronics, an emerging technology that exploits electron spin and its associated magnetic moment as well as electron charge, is an exciting and challenging area of nanotechnology. Spintronic devices, combining the advantages of magnetic materials and semiconductors, are likely to be stable, fast and capable of non-volatile data storage as well as being energy-efficient. Magnetic nanostructures, a crucial configuration and spin dynamics in these magnetic nanostructures is especially important to the development of Spintronics.
In this talk I will present imaging studies of the magnetic dynamics in nanostructured materials using two different methods: time resolved photoemission electron microscopy and magneto-optical Kerr effect microscopy. Magnetic images obtained using these methods have provided critical information for understanding magnetic vortex dynamics in micron and sub-micron scaled magnetic disks and unusual antisymmetric magnetoresistance in Pt/Co/Pt trilayers with a confined straight domain wall.
Biosketch of Dr. Xuemei May Cheng
Dr. Cheng has been doing research in materials science for over 10 years. In 1995 she started her undergraduate research on SiGe based semiconductor materials and devices in Nanjing University, China. She won the Chien-Shiung Wu Scholarship for Excellence in Undergraduate Physics Research. She obtained her B.S. in Physics in 1997 and M.S. in Microelectronics and Solid State Electronics in 2000 from Nanjing University. After that she joined the Ph.D. program in the Department of Physics and Astronomy at John Hopkins University. After awarded her PhD degree in Physics in 2006, she started the postdoctoral research at Argonne National Laboratory. There her research focuses on spin dynamics in nanostructured magnetic materials. So far she has published 30 papers in peer-reviewed journals, including Science, Physical Review Letter and Applied Physics Letter.
Host: Stephen Danforth