Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ

Pajerowski, D. M.; Escanhoela, C. A.; Haskel, D.; Prisk, T. R.; Frontzek, M. D.; Phelan, D.; Mihalik, M.; Mihalik, M.

doi:10.1016/j.jmmm.2019.165968

Title: Nd ordering, cluster formation, and the origin of negative magnetization in NdMn_0.8Fe_0.2O_3+δ

Abstract

The orthorhombic pseudo-perovskite series NdMn_1-xFe_xO_3+δ has negative magnetization, i.e. magnetization directed opposite to an applied field under certain conditions, for x = 0.2 and x = 0.25. We have investigated the microscopic origin of this phenomenon for x = 0.2 by using elastic and inelastic scattering techniques including neutron backscattering, X-ray magnetic circular dichroism at the Mn K and Nd L₂ edges, neutron powder diffraction, and powder inelastic neutron scattering. We find that Nd³⁺ ions possess zero field ordered moments of 1.6 μ_B 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 are consistent with a magnetic domain/cluster model for the negative magnetization in NdMn_0.8Fe_0.2O_3+δ

Authors:

Pajerowski, D. M. ^[1]; Escanhoela, C. A. ^[2]; Haskel, D. ^[3]; Prisk, T. R. ^[4]; Frontzek, M. D. ^[1]; Phelan, D. ^[3]; Mihalik, M. ^[5]; Mihalik, M. ^[5]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Brazilian Center for Research in Energy and Materials, Campinas, SP (Brazil)
Argonne National Lab. (ANL), Lemont, IL (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Slovak Academy of Sciences (SAS), Kosice (Slovakia)

Publication Date:: Wed Oct 09 00:00:00 EDT 2019

Research Org.:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: Sao Paulo Research Foundation (FAPESP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); National Institute of Standards and Technology (NIST)

OSTI Identifier:: 1570440

Alternate Identifier(s):: OSTI ID: 1570913; OSTI ID: 2325158

Grant/Contract Number:: AC02-06CH11357; DMR-1508249; AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Magnetism and Magnetic Materials

Additional Journal Information:: Journal Volume: 497; Journal Issue: C; Journal ID: ISSN 0304-8853

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Pajerowski, D. M., Escanhoela, C. A., Haskel, D., Prisk, T. R., Frontzek, M. D., Phelan, D., Mihalik, M., and Mihalik, M. Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ.  United States: N. p., 2019. 
Web.  doi:10.1016/j.jmmm.2019.165968.

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                    Pajerowski, D. M., Escanhoela, C. A., Haskel, D., Prisk, T. R., Frontzek, M. D., Phelan, D., Mihalik, M., & Mihalik, M. Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ.  United States.  https://doi.org/10.1016/j.jmmm.2019.165968

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                    Pajerowski, D. M., Escanhoela, C. A., Haskel, D., Prisk, T. R., Frontzek, M. D., Phelan, D., Mihalik, M., and Mihalik, M. Wed .  
"Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ".  United States.  https://doi.org/10.1016/j.jmmm.2019.165968.  https://www.osti.gov/servlets/purl/1570440.

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@article{osti_1570440,

  title        = {Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ},

  author       = {Pajerowski, D. M. and Escanhoela, C. A. and Haskel, D. and Prisk, T. R. and Frontzek, M. D. and Phelan, D. and Mihalik, M. and Mihalik, M.},

  abstractNote = {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 = 0.2 and x = 0.25. We have investigated the microscopic origin of this phenomenon for x = 0.2 by using elastic and inelastic scattering techniques including neutron backscattering, X-ray magnetic circular dichroism at the Mn K and Nd L2 edges, neutron powder diffraction, and powder inelastic neutron scattering. We find that Nd3+ ions possess zero field ordered moments of 1.6 μB 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 are consistent with a magnetic domain/cluster model for the negative magnetization in NdMn0.8Fe0.2O3+δ},

  doi          = {10.1016/j.jmmm.2019.165968},

  journal      = {Journal of Magnetism and Magnetic Materials},

  number       = C,

  volume       = 497,

  place        = {United States},

  year         = {Wed Oct 09 00:00:00 EDT 2019},

  month        = {Wed Oct 09 00:00:00 EDT 2019}

}

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https://doi.org/10.1016/j.jmmm.2019.165968

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Cited by: 5 works

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Figure 1: Field-cooled magnetization of NMFO.2.

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Title: Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ

Abstract

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Title: Nd ordering, cluster formation, and the origin of negative magnetization in NdMn_0.8Fe_0.2O_3+δ