Article (Scientific journals)
Field Dependence of Magnetic Disorder in Nanoparticles
Zákutná, Dominika; Nižňanský, Daniel; Barnsley, Lester C. et al.
2020In Physical Review X, 10, p. 031019
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Keywords :
Magnetic Nanoparticles; Micromagnetism; Small-Angle Scattering
Abstract :
[en] The performance characteristics of magnetic nanoparticles toward application, e.g., in medicine and imaging or as sensors, are directly determined by their magnetization relaxation and total magnetic moment. In the commonly assumed picture, nanoparticles have a constant overall magnetic moment originating from the magnetization of the single-domain particle core surrounded by a surface region hosting spin disorder. In contrast, this work demonstrates the significant increase of the magnetic moment of ferrite nanoparticles with an applied magnetic field. At low magnetic field, the homogeneously magnetized particle core initially coincides in size with the structurally coherent grain of 12.8(2) nm diameter, indicating a strong coupling between magnetic and structural disorder. Applied magnetic fields gradually polarize the uncorrelated, disordered surface spins, resulting in a magnetic volume more than 20% larger than the structurally coherent core. The intraparticle magnetic disorder energy increases sharply toward the defect-rich surface as established by the field dependence of the magnetization distribution. In consequence, these findings illustrate how the nanoparticle magnetization overcomes structural surface disorder. This new concept of intraparticle magnetization is deployable to other magnetic nanoparticle systems, where the in-depth knowledge of spin disorder and associated magnetic anisotropies are decisive for a rational nanomaterials design.
Disciplines :
Physics
Author, co-author :
Zákutná, Dominika
Nižňanský, Daniel
Barnsley, Lester C.
Babcock, Earl
Salhi, Zahir
Feoktystov, Artem
Honecker, Dirk ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Disch, Sabrina
External co-authors :
yes
Language :
English
Title :
Field Dependence of Magnetic Disorder in Nanoparticles
Publication date :
2020
Journal title :
Physical Review X
ISSN :
2160-3308
Publisher :
American Physical Society
Volume :
10
Pages :
031019
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 24 July 2020

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