Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 26: Focus: Towards quantitative magnetic measurements at ultimate spatial resolution with electrons
MA 26.5: Invited Talk
Wednesday, March 18, 2015, 11:45–12:15, EB 202
Linking magnetic properties to nanoscale spectral and spatial features — •Thomas Thersleff1, Jan Rusz2, Shunsuke Muto3, and Klaus Leifer1 — 1Department of Engineering Sciences, Uppsala University, Box 534, 75121 Uppsala, Sweden — 2Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden — 3Division of Energy Science, EcoTopia Science Institute, Nagoya University, Chikusa-ku, 464-8603 Nagoya, Japan
The fundamental questions posed by the field of nanomagnetism demand characterization techniques that are both quantitative and capable of resolving nanoscale features. Electron Magnetic Circular Dichroism (EMCD) in the Transmission Electron Microscope (TEM) is a relatively young technique that promises to meet both of these criteria, and it has already demonstrated quantitative results with a spatial resolution superior to what can be achieved with x-rays. An additional advantage of EMCD is that the scattering geometry in the TEM permits the acquisition of an EMCD signal in parallel to a multitude of additional properties, such as composition, valence, strain, and crystallographic structure. In this talk, we describe an EMCD experimental design that enables these disparate property domains to be directly linked to magnetic behavior on the nanoscale. This allows us to quantitatively map the orbital to spin magnetic moment ratio (mL / mS) in real space and correlate it to nanoscale features such as interfaces and the presence of oxide. We also present our progress into the spectral segregation of overlapping EMCD signals from similar materials using blind-source separation techniques.