Magnetic Monopole-Like Behavior in Superparamagnetic Nanoparticle Coated With Chiral Molecules

Qirong Zhu; Sidney R. Cohen; Olga Brontvein; Jonas Fransson; Ron Naaman

doi:10.1002/smll.202406631

Magnetic Monopole-Like Behavior in Superparamagnetic Nanoparticle Coated With Chiral Molecules

Qirong Zhu
, Sidney R. Cohen
, Olga Brontvein
, Jonas Fransson^*
, Ron Naaman^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Superparamagnetic iron oxide nanoparticles (SPIONs) have attracted wide attention due to their promising applications in biomedicine, chemical catalysis, and magnetic memory devices. In this work, the force is measured between a single SPION coated with chiral molecules and a ferromagnetic substrate by atomic force microscopy (AFM), with the substrate magnetized either toward or away from the approaching AFM tip. The force between the coated SPION and the magnetic substrate depends on the handedness of the molecules adsorbed on the SPION and on the direction of the magnetization of the substrate. By inserting nm-scale spacing layers between the coated SPION and the magnetic substrate it is shown that the SPION has a short-range magnetic monopole-like magnetic field. A theoretical framework for the nature of this field is provided.Magnetic monopole-like phenomenon is observed for a superparamagnetic iron oxide nanoparticle (SPION) coated with chiral molecules. Combining force spectroscopy and calculations, this study reveals that the magnetic moment of the SPION behaves like a monopole at close proximity to the particle, at distance of less than 10 nm, the nanoparticle diameter. image

Original language	English
Article number	2406631
Number of pages	8
Journal	Small
Volume	20
Issue number	48
DOIs	https://doi.org/10.1002/smll.202406631
Publication status	Published Online - 29 Aug 2024

Funding

The authors acknowledge the support from Dr. Ifat Kaplan-Ashiri for SEM measurements, Dr. Vitaly Gutkin and Mr. Offek Marelly for the support of XPS measurements, Prof. dr. J. M. van Ruitenbeek and Dr. Yihui Dong for the fruitful discussion. R.N. acknowledges partial support by the U.S. Air Force Office of Scientific Research Grant No. FA9550-21-1-0418 and from the Estate of Rena G. Moses and the Laurie Kayden Foundation. Publisher Copyright: © 2024 The Author(s). Small published by Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

Biotechnology
General Chemistry
Biomaterials
General Materials Science
Engineering (miscellaneous)

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10.1002/smll.202406631Licence: CC BY

Cite this

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title = "Magnetic Monopole-Like Behavior in Superparamagnetic Nanoparticle Coated With Chiral Molecules",

abstract = "Superparamagnetic iron oxide nanoparticles (SPIONs) have attracted wide attention due to their promising applications in biomedicine, chemical catalysis, and magnetic memory devices. In this work, the force is measured between a single SPION coated with chiral molecules and a ferromagnetic substrate by atomic force microscopy (AFM), with the substrate magnetized either toward or away from the approaching AFM tip. The force between the coated SPION and the magnetic substrate depends on the handedness of the molecules adsorbed on the SPION and on the direction of the magnetization of the substrate. By inserting nm-scale spacing layers between the coated SPION and the magnetic substrate it is shown that the SPION has a short-range magnetic monopole-like magnetic field. A theoretical framework for the nature of this field is provided.Magnetic monopole-like phenomenon is observed for a superparamagnetic iron oxide nanoparticle (SPION) coated with chiral molecules. Combining force spectroscopy and calculations, this study reveals that the magnetic moment of the SPION behaves like a monopole at close proximity to the particle, at distance of less than 10 nm, the nanoparticle diameter. image",

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AU - Zhu, Qirong

AU - Cohen, Sidney R.

AU - Brontvein, Olga

AU - Fransson, Jonas

AU - Naaman, Ron

PY - 2024/8/29

Y1 - 2024/8/29

N2 - Superparamagnetic iron oxide nanoparticles (SPIONs) have attracted wide attention due to their promising applications in biomedicine, chemical catalysis, and magnetic memory devices. In this work, the force is measured between a single SPION coated with chiral molecules and a ferromagnetic substrate by atomic force microscopy (AFM), with the substrate magnetized either toward or away from the approaching AFM tip. The force between the coated SPION and the magnetic substrate depends on the handedness of the molecules adsorbed on the SPION and on the direction of the magnetization of the substrate. By inserting nm-scale spacing layers between the coated SPION and the magnetic substrate it is shown that the SPION has a short-range magnetic monopole-like magnetic field. A theoretical framework for the nature of this field is provided.Magnetic monopole-like phenomenon is observed for a superparamagnetic iron oxide nanoparticle (SPION) coated with chiral molecules. Combining force spectroscopy and calculations, this study reveals that the magnetic moment of the SPION behaves like a monopole at close proximity to the particle, at distance of less than 10 nm, the nanoparticle diameter. image

AB - Superparamagnetic iron oxide nanoparticles (SPIONs) have attracted wide attention due to their promising applications in biomedicine, chemical catalysis, and magnetic memory devices. In this work, the force is measured between a single SPION coated with chiral molecules and a ferromagnetic substrate by atomic force microscopy (AFM), with the substrate magnetized either toward or away from the approaching AFM tip. The force between the coated SPION and the magnetic substrate depends on the handedness of the molecules adsorbed on the SPION and on the direction of the magnetization of the substrate. By inserting nm-scale spacing layers between the coated SPION and the magnetic substrate it is shown that the SPION has a short-range magnetic monopole-like magnetic field. A theoretical framework for the nature of this field is provided.Magnetic monopole-like phenomenon is observed for a superparamagnetic iron oxide nanoparticle (SPION) coated with chiral molecules. Combining force spectroscopy and calculations, this study reveals that the magnetic moment of the SPION behaves like a monopole at close proximity to the particle, at distance of less than 10 nm, the nanoparticle diameter. image

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Magnetic Monopole-Like Behavior in Superparamagnetic Nanoparticle Coated With Chiral Molecules

Abstract

Funding

All Science Journal Classification (ASJC) codes

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