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PGI Colloquium:

Prof. Dr. Josep Nogués,
Catalan Institute of Nanoscience and Nanotechnology (ICN2), Bellaterra (Barcelona), Spain

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

13 Apr 2018 11:00

Interface Interactions in Fe3O4-Mn3O4 Core/Shell Nanoparticles

NoguesCopyright: Prof. Dr. Nogués

The coupling between different magnetic layers in thin film systems is usually ferromagnetic (FM) (layers parallel to each other). However, other types of couplings such as antiferromagnetic (AFM) (i.e., antiparallel layers) have also been reported. In contrast, the magnetic properties of bi-magnetic core/shell nanoparticles remain relatively unexplored. While Monte Carlo simulations have probed the effects of different types of interface couplings from the theoretical viewpoint (e.g., FM vs. AFM coupling), experimental work so far has only reported ferromagnetic coupling between the counterparts. Here we demonstrate, using diverse techniques, the existence of such interfacial AFM coupling in ferrimagnetic (FiM) soft/hard and hard/soft core/shell nanoparticles based on iron and manganese oxides., Fe3O4-Mn3O4. Moreover, we will show that the strong interface coupling in this system leads to a strong magnetic proximity effect which dramatically enhances the magnetic stability of Mn3O4 from the bulk TC of 40 K to above room temperature.


Dr. Martina Luysberg
Phone: +49 2461 61-2417
Fax: +49 2461 61-6444