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Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods

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Bibliographic Details
Main Author: Das, Raja
Other Authors: Kalappattil, Vijaysankar
Format: Article
Language:English
Published: Journal of Magnetism and Magnetic Materials 2021
Subjects:
Magnetite
Nanorods
Magnetic anisotropy
Coupled electron hopping
Online Access:https://www.sciencedirect.com/science/article/abs/pii/S0304885320325312?via%3Dihub
https://dlib.phenikaa-uni.edu.vn/handle/PNK/1727
https://doi.org/10.1016/j.jmmm.2020.167564
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spelling oai:localhost:PNK-17272022-08-17T05:54:44Z Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods Das, Raja Kalappattil, Vijaysankar Phan, Manh-Huong Srikanth, Hariharan Magnetite Nanorods Magnetic anisotropy Coupled electron hopping Q2 Magnetite has fascinated researchers for decades, due to its wide range of applications from spintronics to biomedicine. Despite a large body of works aimed at its magnetic properties, no consensus has been reached on the physical origin of the low temperature magnetic anomalies observed in magnetite. Although, a lot of work has been done in studying magnetite nanoparticles, but studies on the low temperature anomalies in those nanoparticles still remains unresearched. We report on the observation of the low temperature magnetic anomalies in highly crystalline, stoichiometric Fe3O4 nanorods and relate them to the coupled electron hopping relaxation process and domain wall motion. Both DC and AC susceptibility show the presence of a hump around 35 K, which is associated with the relaxation of Fe+2 extra electrons. Radio-frequency transverse susceptibility (TS) measurements indicated a noticeable increase in anisotropy field below ~ 25 K, which is attributed to the rearrangement of Fe+2 electrons in the octahedral sites. TS experiments also revealed the domain wall freezing below ~ 35 K. Our combined DC, AC and TS susceptibility studies shed light on the complex nature of the low-temperature magnetic behavior in nanostructured magnetite. 2021-06-14T04:05:29Z 2021-06-14T04:05:29Z 2021 Article Working Paper https://www.sciencedirect.com/science/article/abs/pii/S0304885320325312?via%3Dihub https://dlib.phenikaa-uni.edu.vn/handle/PNK/1727 https://doi.org/10.1016/j.jmmm.2020.167564 en application/pdf Journal of Magnetism and Magnetic Materials
institution Digital Phenikaa
collection Digital Phenikaa
language English
topic Magnetite
Nanorods
Magnetic anisotropy
Coupled electron hopping
spellingShingle Magnetite
Nanorods
Magnetic anisotropy
Coupled electron hopping
Das, Raja
Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
description Q2
author2 Kalappattil, Vijaysankar
author_facet Kalappattil, Vijaysankar
Das, Raja
format Article
author Das, Raja
author_sort Das, Raja
title Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
title_short Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
title_full Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
title_fullStr Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
title_full_unstemmed Magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
title_sort magnetic anomalies associated with domain wall freezing and coupled electron hopping in magnetite nanorods
publisher Journal of Magnetism and Magnetic Materials
publishDate 2021
url https://www.sciencedirect.com/science/article/abs/pii/S0304885320325312?via%3Dihub
https://dlib.phenikaa-uni.edu.vn/handle/PNK/1727
https://doi.org/10.1016/j.jmmm.2020.167564
_version_ 1751856294774439936
score 8.891053

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