SEMINAR 1. Title : Imaging nanoscale magnetism with scanning magnetometers based on diamond quantum defects 2. Speaker : Donghun Lee.

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SEMINAR 1. Title : Imaging nanoscale magnetism with scanning magnetometers based on diamond quantum defects 2. Speaker : Donghun Lee (Department of Physics, Korea University) 3. Time : 16:00 – 17:00, Thursday, March 23, 2016 4. Place : e+ Lecture Hall (room 83188), 2nd Research Building, Sungkyunkwan University 5. Summary : Probing and imaging magnetism at nanometer scale with high field sensitivity is of great interest in a wide range of fields, including solid-state physics, materials science and biomedical applications. In this talk, I will introduce a novel scanning magnetometer based on nitrogen-vacancy (NV) defect center in diamond. The diamond NV center has promising potential for nanometer and nanotesla magnetometry due to its atomic-scale size, long spin coherence times and high magnetic field sensitivity (e.g. < nT/Hz1/2). Since these properties are robust against a wide range of operating temperature, it is also suitable for studying novel magnetic materials exhibiting temperature-dependent magnetic orders. I will present basic working principle of the system and examples of imaging magnetic samples including room temperature skyrmion. 6 Background : Education 2010 Ph.D., Physics, Ohio State University, USA 2002 B.S. cum laude, Material Science and Engineering, Pohang University of Science and Technology, Republic of Korea Work 2016 – present Assistant Professor at Department of Physics, Korea University 2014 - 2015 Associate Specialist at Department of Physics, University of California at Santa Barbara (Advisor: Prof. Ania Jayich) 2011 – 2014 Post Doctoral Researcher at Department of Physics, Yale University (Advisor: Prof. Jack Harris) 7. Questions : (☏ 031-299-4115)