Giant enhancement and anomalous thermal hysteresis of saturation moment in magnetic nanoparticles embedded in multiwalled carbon nanotubes

Guo-Meng Zhao; Jun Wang; Yang Ren; Pieder Beeli

doi:10.1021/nl401685h

Giant enhancement and anomalous thermal hysteresis of saturation moment in magnetic nanoparticles embedded in multiwalled carbon nanotubes

Guo-Meng Zhao, Jun Wang, Yang Ren, Pieder Beeli

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

4 Citations (Scopus)

Abstract

We report high-energy synchrotron X-ray diffraction spectrum and high-temperature magnetic data for multiwalled carbon nanotubes (MWCNTs) embedded with Fe and Fe₃O₄ nanoparticles. We unambiguously show that the saturation moments of the embedded Fe and Fe₃O ₄ nanoparticles are enhanced by a factor of about 3.0 compared with what would be expected if they would be unembedded. More intriguingly the enhanced moments were completely lost when the sample was heated up to 1120 K, and the lost moments were completely recovered through two more thermal cycles below 1020 K. These novel results cannot be explained by the magnetism of the Fe and Fe₃O₄ impurity phases, the magnetic proximity effect between magnetic nanoparticles and carbon, and the ballistic transport of MWCNTs. © 2013 American Chemical Society.

Original language	English
Pages (from-to)	2993-2996
Journal	Nano Letters
Volume	13
Issue number	6
DOIs	https://doi.org/10.1021/nl401685h
Publication status	Published - 12 Jun 2013
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Anomalous thermal hysteresis
Giant moment enhancement
High-field paramagnetic Meissner effect
Magnetic nanoparticles
Magnetic proximity effect
Multiwalled carbon nanotubes

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title = "Giant enhancement and anomalous thermal hysteresis of saturation moment in magnetic nanoparticles embedded in multiwalled carbon nanotubes",

abstract = "We report high-energy synchrotron X-ray diffraction spectrum and high-temperature magnetic data for multiwalled carbon nanotubes (MWCNTs) embedded with Fe and Fe3O4 nanoparticles. We unambiguously show that the saturation moments of the embedded Fe and Fe3O 4 nanoparticles are enhanced by a factor of about 3.0 compared with what would be expected if they would be unembedded. More intriguingly the enhanced moments were completely lost when the sample was heated up to 1120 K, and the lost moments were completely recovered through two more thermal cycles below 1020 K. These novel results cannot be explained by the magnetism of the Fe and Fe3O4 impurity phases, the magnetic proximity effect between magnetic nanoparticles and carbon, and the ballistic transport of MWCNTs. {\textcopyright} 2013 American Chemical Society.",

keywords = "Anomalous thermal hysteresis, Giant moment enhancement, High-field paramagnetic Meissner effect, Magnetic nanoparticles, Magnetic proximity effect, Multiwalled carbon nanotubes",

author = "Guo-Meng Zhao and Jun Wang and Yang Ren and Pieder Beeli",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

year = "2013",

month = jun,

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doi = "10.1021/nl401685h",

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volume = "13",

pages = "2993--2996",

journal = "Nano Letters",

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TY - JOUR

T1 - Giant enhancement and anomalous thermal hysteresis of saturation moment in magnetic nanoparticles embedded in multiwalled carbon nanotubes

AU - Zhao, Guo-Meng

AU - Wang, Jun

AU - Ren, Yang

AU - Beeli, Pieder

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2013/6/12

Y1 - 2013/6/12

N2 - We report high-energy synchrotron X-ray diffraction spectrum and high-temperature magnetic data for multiwalled carbon nanotubes (MWCNTs) embedded with Fe and Fe3O4 nanoparticles. We unambiguously show that the saturation moments of the embedded Fe and Fe3O 4 nanoparticles are enhanced by a factor of about 3.0 compared with what would be expected if they would be unembedded. More intriguingly the enhanced moments were completely lost when the sample was heated up to 1120 K, and the lost moments were completely recovered through two more thermal cycles below 1020 K. These novel results cannot be explained by the magnetism of the Fe and Fe3O4 impurity phases, the magnetic proximity effect between magnetic nanoparticles and carbon, and the ballistic transport of MWCNTs. © 2013 American Chemical Society.

AB - We report high-energy synchrotron X-ray diffraction spectrum and high-temperature magnetic data for multiwalled carbon nanotubes (MWCNTs) embedded with Fe and Fe3O4 nanoparticles. We unambiguously show that the saturation moments of the embedded Fe and Fe3O 4 nanoparticles are enhanced by a factor of about 3.0 compared with what would be expected if they would be unembedded. More intriguingly the enhanced moments were completely lost when the sample was heated up to 1120 K, and the lost moments were completely recovered through two more thermal cycles below 1020 K. These novel results cannot be explained by the magnetism of the Fe and Fe3O4 impurity phases, the magnetic proximity effect between magnetic nanoparticles and carbon, and the ballistic transport of MWCNTs. © 2013 American Chemical Society.

KW - Anomalous thermal hysteresis

KW - Giant moment enhancement

KW - High-field paramagnetic Meissner effect

KW - Magnetic nanoparticles

KW - Magnetic proximity effect

KW - Multiwalled carbon nanotubes

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U2 - 10.1021/nl401685h

DO - 10.1021/nl401685h

M3 - RGC 21 - Publication in refereed journal

SN - 1530-6984

VL - 13

SP - 2993

EP - 2996

JO - Nano Letters

JF - Nano Letters

IS - 6

ER -

Giant enhancement and anomalous thermal hysteresis of saturation moment in magnetic nanoparticles embedded in multiwalled carbon nanotubes

Abstract

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