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Title: Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules

Abstract

The rapid growth in demand for data and the emerging applications of Big Data require the increase of memory capacity. Magnetic memory devices are among the leading technologies for meeting this demand; however, they rely on the use of ferromagnets that creates size reduction limitations and poses complex materials requirements. Typically magnetic memory sizes are limited to 30–50 nm. Reducing the size even further, to the ≈10–20 nm scale, destabilizes the magnetization and its magnetic orientation becomes susceptible to thermal fluctuations and stray magnetic fields. In the present work, it is shown that 10 nm single domain ferromagnetism can be achieved. Using asymmetric adsorption of chiral molecules, superparamagnetic iron oxide nanoparticles become ferromagnetic with an average coercive field of ≈80 Oe. The asymmetric adsorption of molecules stabilizes the magnetization direction at room temperature and the orientation is found to depend on the handedness of the chiral molecules. These works point to a novel method for the miniaturization of ferromagnets (down to ≈10 nm) using established synthetic protocols.

Authors:
 [1];  [2];  [3];  [3];  [1];  [1];  [4];  [4];  [5];  [2];  [3];  [1]; ORCiD logo [1]
  1. Hebrew Univ. of Jerusalem (Israel)
  2. Weizmann Inst. of Science, Rehovot (Israel)
  3. Univ. of Pittsburgh, PA (United States)
  4. National Research Council (CNR), Bari (Italy). Inst. for Chemical and Physical Processes (IPCF)
  5. Univ. degli Studi di Bari (Italy)
Publication Date:
Research Org.:
Univ. of Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Volkswagen Foundation; Israel Science Foundation; European Research Council (ERC)
OSTI Identifier:
1604934
Alternate Identifier(s):
OSTI ID: 1483026
Grant/Contract Number:  
FG02-07ER46430; FP7/2007‐2013
Resource Type:
Accepted Manuscript
Journal Name:
Small
Additional Journal Information:
Journal Volume: 15; Journal Issue: 1; Journal ID: ISSN 1613-6810
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; chiral molecules; magnetic memory; magnetic nanoparticles; spintronics; superparamagnetism

Citation Formats

Koplovitz, Guy, Leitus, Gregory, Ghosh, Supriya, Bloom, Brian P., Yochelis, Shira, Rotem, Dvir, Vischio, Fabio, Striccoli, Marinella, Fanizza, Elisabetta, Naaman, Ron, Waldeck, David H., Porath, Danny, and Paltiel, Yossi. Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules. United States: N. p., 2018. Web. doi:10.1002/smll.201804557.
Koplovitz, Guy, Leitus, Gregory, Ghosh, Supriya, Bloom, Brian P., Yochelis, Shira, Rotem, Dvir, Vischio, Fabio, Striccoli, Marinella, Fanizza, Elisabetta, Naaman, Ron, Waldeck, David H., Porath, Danny, & Paltiel, Yossi. Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules. United States. https://doi.org/10.1002/smll.201804557
Koplovitz, Guy, Leitus, Gregory, Ghosh, Supriya, Bloom, Brian P., Yochelis, Shira, Rotem, Dvir, Vischio, Fabio, Striccoli, Marinella, Fanizza, Elisabetta, Naaman, Ron, Waldeck, David H., Porath, Danny, and Paltiel, Yossi. Wed . "Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules". United States. https://doi.org/10.1002/smll.201804557. https://www.osti.gov/servlets/purl/1604934.
@article{osti_1604934,
title = {Single Domain 10 nm Ferromagnetism Imprinted on Superparamagnetic Nanoparticles Using Chiral Molecules},
author = {Koplovitz, Guy and Leitus, Gregory and Ghosh, Supriya and Bloom, Brian P. and Yochelis, Shira and Rotem, Dvir and Vischio, Fabio and Striccoli, Marinella and Fanizza, Elisabetta and Naaman, Ron and Waldeck, David H. and Porath, Danny and Paltiel, Yossi},
abstractNote = {The rapid growth in demand for data and the emerging applications of Big Data require the increase of memory capacity. Magnetic memory devices are among the leading technologies for meeting this demand; however, they rely on the use of ferromagnets that creates size reduction limitations and poses complex materials requirements. Typically magnetic memory sizes are limited to 30–50 nm. Reducing the size even further, to the ≈10–20 nm scale, destabilizes the magnetization and its magnetic orientation becomes susceptible to thermal fluctuations and stray magnetic fields. In the present work, it is shown that 10 nm single domain ferromagnetism can be achieved. Using asymmetric adsorption of chiral molecules, superparamagnetic iron oxide nanoparticles become ferromagnetic with an average coercive field of ≈80 Oe. The asymmetric adsorption of molecules stabilizes the magnetization direction at room temperature and the orientation is found to depend on the handedness of the chiral molecules. These works point to a novel method for the miniaturization of ferromagnets (down to ≈10 nm) using established synthetic protocols.},
doi = {10.1002/smll.201804557},
journal = {Small},
number = 1,
volume = 15,
place = {United States},
year = {Wed Nov 21 00:00:00 EST 2018},
month = {Wed Nov 21 00:00:00 EST 2018}
}

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Works referencing / citing this record:

Light-driven molecular switch for reconfigurable spin filters
journal, June 2019


Chiral molecules-ferromagnetic interfaces, an approach towards spin controlled interactions
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Influence of Magnetic Micelles on Assembly and Deposition of Porphyrin J-Aggregates
journal, January 2020

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Light-driven molecular switch for reconfigurable spin filters
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Influence of Magnetic Micelles on Assembly and Deposition of Porphyrin J-Aggregates
journal, January 2020

  • Castriciano, Maria Angela; Trapani, Mariachiara; Romeo, Andrea
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