Alena, Leqi, Yilun and Xiao conducted research at Beamline 4-ID-D of the Advanced Photon Source (APS) of Argonne National Laboratory between July 18-22, 2014. During their time at APS, they collaborated with Argonne scientist Dr. Yong Choi and Dr. Li Sun’s group of Houston University on interface magnetism.
Yilun Tang, Xiao Wang, Leqi Liu and Alena Klindziuk at Argonne National Laboratory
Congratulations to Soraya Terrab on her first paper entitled “Temperature controlled tensile testing of individual nanowires” published in Review of Scientific Instruments! This paper is based on Soraya’s senior thesis work. Soraya graduated with honor in May 2013 and she is now a graduate student in University of Colorado.
Bingqing Li received the Outstanding Undergraduate Presentation Award at the American Physical Society March Meeting on Tuesday March 19, 2013 for her presentation titled “Study of Thermal Conductivity of Si Nanowires with micro-Raman Spectroscopy”. Both Bingqing and Maggie Xiao received a Future of Physics Days Scholar Travel Award to attend this meeting in Baltimore.
Bingqing and Maggie holding their awards
Undergraduate students in our research group, Bingqing Li and Soraya Terrab have been awarded Fall 2012 Research Funding by Dean’s Office, Bryn Mawr Collge, in support of their current research projects collaborating with Department of Materials Science and Engineering, University of Pennsylvania. Bingqing is working on the study of thermal conductivity of Si nanowires with micro-Raman spectroscopy. Soraya’s project is focusing on Microscopy cryostat installation and calibration of MEMS-based thermal actuators.
The new Vibrating Sample Magnetometer
Prof. Arlo Weil and Prof. Xuemei Cheng have recently purchased a much anticipated new Vibrating Sample Magnetometer (VSM), which has just been installed and is up and running in Park 156. As a way of showing off the new machine, and more importantly giving us all a chance to mingle, we are offering a hosted beer-and-snack open house event this Friday on the first floor hall outside of room 156.
Professor Xuemei Cheng has received a CAREER award for her proposal “Magnetic Bubble Dynamics in Nanodisks with Perpendicular Magnetic Anisotropy ” from the National Science Foundation starting June 01, 2011. The Faculty Early Career Development (CAREER) Program offers the National Science Foundation’s most prestigious awards in support of junior faculty who exemplify the role of teacher-scholars through outstanding research, excellent education and the integration of education and research within the context of the mission of their organizations.
Cheng’s research interests lie in the area of nanomagnetism, a particularly exciting area of research due to its fundamental role in physics as well as its potential technological applications. The development of advanced nanotechnology enables the manipulation of materials at the nanoscale to realize new functionality.
In her NSF CAREER proposal, Cheng plans to design, fabricate and study novel magnetic nanodisks with perpendicular magnetic anisotropy. This will be accomplished by employing the most advance tools of experimental science: nanofabrication, high-resolution magnetic imaging, time-resolved synchrotron x-ray imaging with high temporal and spatial resolutions, and micromagnetic simulations. This research is expected to provide a new understanding of spin dynamics in nanomagnets, shed light on a variety of fundamental physics topics in nanomagnetism, and widen the scope for dynamical experiments in nanomagnets.
2011 Intermag, Taipei
Prof. Cheng was invited to present her research on spin dynamics of magnetic vortices in patterned magnetic disks on 2011 IEEE International Magnetics Conference held in Taipei, Taiwan from April 25 to 29.
The magnetic vortex is a three-dimensional spin structure that consists of a circulating in-plane magnetization and an out-of-plane vortex core. The in-plane magnetization of a vortex can have two chiralities (clockwise or counterclockwise) and the vortex core can have two polarities (up or down), making it attractive for information storage. The spin dynamics of magnetic vortices have been of great interest because they not only offer insights into fundamental magnetization processes but also have potential applications in nonvolatile data storage.
Prof. Cheng and her collaborator, Dr. David Keavney, from Argonne National Laboratory have used x-ray PEEM in a pump-probe arrangement to image the response of magnetic vortices in lithography patterned Permalloy disks to fast magnetic field pulses. Her invited talk entitled “Time-resolved PEEM studies of nonlinear vortex dynamics” was well received.
Prof. Cheng also served as one of the judges for “the Best Student Presentation” on this conference.
Three undergraduate students from our group, Cathy Yang, Jiabin Liu, and Qian Wu, presented on 2011 APS March Meeting at Dallas, TX. Cathy made an oral presentation entitled “Templated Electrodeposition of Highly Porous Nanostructured Materials “. Jiabin and Qian presented a poster entitled “Templated electrodeposition of nanoporous silicon for battery applications “. Both of the presentations were well received.
Prof. Cheng at EYH, 2011
Prof. Cheng led workshops for “Expending Your Horizons” (EYH) at Swarthmore on March 26. Expanding Your Horizons at Swarthmore College is an annual conference for local middle school girls aimed at fostering an interest in mathematics, the sciences, engineering, and other fields that are often considered nontraditional for women. At an age where many girls begin to struggle or lose interest in these subjects, the goal of this conference is to spark new excitement for continued study through a day filled with hands-on workshops and discussion.
Prof. Cheng led two sessions focusing on “Nanoscience and the wonderful world of color”. She introduced to local middle school girls basic concepts related to the exciting nanosciences, explained the physics origin of the iridescence of butterfly wings and CD disks, and she also helped the girls make their own spectroscope from a regular CD. She interacted with about 20 middle school girls and their parents.