Consequences of the CMR effect on EELS in TEM

Wolfgang Wallisch; Michael Stöger-Pollach; Edvinas Navickas

doi:10.1016/j.ultramic.2017.04.011

Consequences of the CMR effect on EELS in TEM

Ultramicroscopy. 2017 Aug:179:84-89. doi: 10.1016/j.ultramic.2017.04.011. Epub 2017 Apr 15.

Authors

Wolfgang Wallisch¹, Michael Stöger-Pollach², Edvinas Navickas³

Affiliations

¹ University Service Centre for Transmission Electron Microscopy, Technische Universitát Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria. Electronic address: [email protected].
² University Service Centre for Transmission Electron Microscopy, Technische Universitát Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria.
³ Institute of Chemical Technologies and Analytics, Technische Universität Wien, Getreidemarkt 9, A-1040 Wien, Austria.

PMID: 28448829
DOI: 10.1016/j.ultramic.2017.04.011

Abstract

Double perovskite oxides have gained in importance and exhibit negative magnetoresistance, which is known as colossal magnetoresistance (CMR) effect. Using a La₂CoMnO₆ (LCM) thin film layer, we proved that the physical consequences of the CMR effect do also influence the electron energy loss spectrometry (EELS) signal. We observed a change of the band gap at low energy losses and were able to study the magnetisation with chemical sensitivity by employing energy loss magnetic chiral dichroism (EMCD) below the Curie temperature T_C, where the CMR effect becomes significant.

Keywords: Band gap; CMR; EMCD; Low loss; VEELS.

Publication types

Research Support, Non-U.S. Gov't