NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Nd Ordering, Cluster Formation, and the Origin of Negative Magnetization in NdMn0l8Fe0.2O3=δ
Published
Author(s)
D. M. Pajerowski, Jr. C. A. Escanhoela, D. Haskel, Timothy R Prisk, M. D. Frontzek, D. Phelan, Jr. Mihalik, M. Mihalik
Abstract
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.
Pajerowski, D.
, Escanhoela, J.
, Haskel, D.
, Prisk, T.
, Frontzek, M.
, Phelan, D.
, Mihalik, J.
and Mihalik, M.
(2020),
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 October 17, 2025)