Evolution of the magnetic coherent length in bi-magnetic core/shell nanoparticles (Fe3O4/Mn3O4) by polarized neutrons under applied field
In bi-magnetic core/shell nanoparticles with antiferromagnetic interface coupling at high fields the antiferromagnetic coupling is overcome and shell and core align ferromagnetically. However, the details of the coupling remain poorly understood. Here we propose to carry out a polarized powder neutron diffraction (PPND) study of Fe3O4/Mn3O4 core/shell nanoparticles with antiferromagnetic interface coupling. Our preliminary PPND study of the Fe3O4/Mn3O4 particles indicates that that, although at low fields the magnetization of the Fe3O4 and Mn3O4 moieties are antiparallel, at high fields they align parallel. The analysis reveals other unusual phenomena like inhomogeneous canting or unusually small magnetic coherent lengths in the Fe3O4 core. Our experiment did not have sufficient statistics to obtain reliable parameters, hampering any significant conclusions. Thus, we propose to carry out a PPND experiment on the same Fe3O4/Mn3O4 samples with enough statistics to perform meaningful fits. The analysis will allow us to study the evolution of the different parameters as the magnetization of the shell rotates with increasing fields.
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NOGUES Josep; ESTRADER Marta; A. G. Roca; GOUKASSOV Arsen; Thomas C. Hansen; KIBALIN Iurii and Alberto López-Ortega. (2021). Evolution of the magnetic coherent length in bi-magnetic core/shell nanoparticles (Fe3O4/Mn3O4) by polarized neutrons under applied field. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-932
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