Nd Ordering, Cluster Formation, and the Origin of Negative Magnetization in NdMn0l8Fe0.2O3=δ
D. M. Pajerowski, Jr. C. A. Escanhoela, D. Haskel, Timothy R Prisk, M. D. Frontzek, D. Phelan, Jr. Mihalik, M. Mihalik
The orthorhombic pseudo-perovskite series NdMn1-xFexO3+δ has negative magnetization, i.e. magnetization directed opposite to an applied field under certain conditions, for x = 0.3 and x=0.25. We have investigated the microscopic origin of this phenomenon for X = 0.2 by using a comprehensive array of elastic and inelastic scattering techniques including neutron backscattering, x-ray magnetic circular dichroism at the Mn K and Nd L6d2 edges, neutron powder diffraction, and powder inelastic neutron scattering. We find that Nd3+ ions possess zero field ordered moments of 1.6 υ^dΒ per ion at 1.5 K oriented parallel to the Mn moments. Based upon the neutron diffraction, there is a freezing of magnetic clusters before the long range order sets in. The Nd crystal field levels shift with temperature due to a molecular field that is 1.1 meV at 1.5 K. These findings help to explain the previously observed negative magnetization in this material as due to a magnetic domain effect.
, Escanhoela, J.
, Haskel, D.
, Prisk, T.
, Frontzek, M.
, Phelan, D.
, Mihalik, J.
and Mihalik, M.
Nd Ordering, Cluster Formation, and the Origin of Negative Magnetization in NdMn<sub>0l8</sub>Fe<sub>0.2</sub>O<sub>3=δ</sub>, Journal of Magnetism and Magnetic Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926014
(Accessed November 28, 2023)