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Consequences of the CMR effect on EELS in TEM.
Wolfgang Wallisch1, Michael Stöger-Pollach1, Edvinas Navickas2
1University Service Centre for Transmission Electron Microscopy, Technische Universitát Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria.
Ultramicroscopy
|April 28, 2017
Summary
Double perovskite oxides show colossal magnetoresistance (CMR). This study demonstrates how CMR influences electron energy loss spectrometry (EELS) signals in La2CoMnO6 thin films, enabling magnetic studies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Double perovskite oxides are increasingly important materials.
- These materials exhibit colossal magnetoresistance (CMR), a significant change in electrical resistance under a magnetic field.
- The interplay between CMR and electron energy loss spectrometry (EELS) is not fully understood.
Purpose of the Study:
- To investigate the influence of the colossal magnetoresistance (CMR) effect on electron energy loss spectrometry (EELS) signals.
- To explore the potential of EELS techniques for studying magnetic properties in double perovskite oxides.
Main Methods:
- Utilized a La2CoMnO6 (LCM) thin film.
- Employed electron energy loss spectrometry (EELS) to analyze the material.
- Applied energy loss magnetic chiral dichroism (EMCD) below the Curie temperature (TC).
Main Results:
- Observed a change in the band gap at low energy losses, linked to the CMR effect.
- Demonstrated the capability to study magnetization with chemical sensitivity using EMCD.
- Confirmed that the CMR effect significantly influences EELS signals below TC.
Conclusions:
- The colossal magnetoresistance (CMR) effect in double perovskite oxides measurably impacts electron energy loss spectrometry (EELS) signals.
- Energy loss magnetic chiral dichroism (EMCD) is a viable technique for chemically sensitive magnetic studies in these materials below their Curie temperature.
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