Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

The phenomenon of negative remanent magnetization (NRM) has been observed experimentally in a number of heterogeneous magnetic systems and has been considered anomalous. The existence of NRM in homogenous magnetic materials is still in debate, mainly due to the lack of compelling support from experi...

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Bibliographic Details
Published in:Scientific reports 2014-09, Vol.4 (1), p.6267-6267, Article 6267
Main Authors: Gu, Shuo, He, Weidong, Zhang, Ming, Zhuang, Taisen, Jin, Yi, ElBidweihy, Hatem, Mao, Yiwu, Dickerson, James H., Wagner, Michael J., Torre, Edward Della, Bennett, Lawrence H.
Format: Article
Language:English
Subjects:
639/301/119
639/925
639/925/357/997
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONDENSED-MATTER PHYSICS
Europium
Humanities and Social Sciences
Hysteresis
MAGNETIC PROPERTIES AND MATERIALS
Magnetism
MATERIALS SCIENCE
multidisciplinary
Nanoparticles
NANOSCIENCE AND TECHNOLOGY
Science
Science & Technology - Other Topics
Sulfides
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Summary:The phenomenon of negative remanent magnetization (NRM) has been observed experimentally in a number of heterogeneous magnetic systems and has been considered anomalous. The existence of NRM in homogenous magnetic materials is still in debate, mainly due to the lack of compelling support from experimental data and a convincing theoretical explanation for its thermodynamic validation. Here we resolve the long-existing controversy by presenting experimental evidence and physical justification that NRM is real in a prototype homogeneous ferromagnetic nanoparticle, an europium sulfide nanoparticle. We provide novel insights into major and minor hysteresis behavior that illuminate the true nature of the observed inverted hysteresis and validate its thermodynamic permissibility and, for the first time, present counterintuitive magnetic aftereffect behavior that is consistent with the mechanism of magnetization reversal, possessing unique capability to identify NRM. The origin and conditions of NRM are explained quantitatively via a wasp-waist model, in combination of energy calculations.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep06267